Mihaela Ioana Georgescu - Academia.edu (original) (raw)
Papers by Mihaela Ioana Georgescu
Applied Sciences
Nowadays, intensive agriculture correlated with the impact of climate change has led to nutrient ... more Nowadays, intensive agriculture correlated with the impact of climate change has led to nutrient soil depletion and the salinization of agricultural lands, making them unsuitable for conventional agricultural crops, with a direct impact on the food industry. Therefore, it is necessary to find sustainable alternative solutions that satisfy the needs of both consumers and food production. One such solution may be represented by salt-tolerant species that can fulfill food requirements. One of the most promising salt-tolerant plant species that can be used is Salicornia europaea L. The present work was conducted in greenhouse conditions, and the adaptability of the species on different cultivation substrates was investigated by means of monitoring the plant indicators such as cuticle, epidermis, parenchyma, polyphenols content, and minerals. Moreover, the correlation between the polyphenol and mineral contents was highlighted. Therefore, three cultivation substrates with different level...
Orchidaceae is the second largest families of flowering plants. There are approximately 900 orchi... more Orchidaceae is the second largest families of flowering plants. There are approximately 900 orchid genera comprising between 28,000-32,000 species of orchids. The relationship between orchids and mankind is complex. The history of orchids' discovery goes hand in hand with the history of humanity, encompassing discovery and adventure, witchcraft and magic, symbolism and occultism, addiction and sacrifice, lust and wealth. Historically, the Chinese were the first to cultivate orchids as medicinal plants, more than 4000 years ago. Gradually, records about orchids spread, reaching the Middle East and Europe. Around 300 B.C., Theophrastus named them for the first time orkhis. In 1737, Carl Linnaeus first used the word Orchidaceae to designate plants with similar features. The family name, Orchidaceae was fully established in 1789, by Antoine Laurent de Jussieu. In 1862, Charles Darwin published the first edition of his book, Fertilisation of Orchids. Darwin considered the adaptations of orchid flowers to their animal pollinators as being among the best examples of his idea of evolution through natural selection. Orchidology was on its way. During the 18th and the 19th centuries, orchids generated the notorious Orchid Fever where orchid-hunters turned the search for orchids into a frantic and obsessive hunt. Ever since, orchids have conquered the world, becoming a much-desired, multibillion-dollar commodity.
The purpose of this study was to reveal by optical microscopy and ultra-microscopy the changes in... more The purpose of this study was to reveal by optical microscopy and ultra-microscopy the changes induced in the cells and tissues of strawberry plants by different treatments with elicitors obtained from fungal strains to activate various metabolic pathways involved in the defense response of plants against pathogens. The diseases control is generally based on use of chemical pesticides, genetic resistant plant species and adequate agro-technical measures. Environment pollution with pesticide residues and the long period necessary to obtain genetic resistance in crop plants led to finding strategies based on inducing plant defense mechanism by appropriate stimuli. Thus, research has demonstrated the possibility to induce plant resistance to various pathogens from genera Fusarium, Plasmopara, Verticillium, Erwinia, Pseudomonas. Attempts have been done to assess the morphological and biochemical basis of resistance in plants of tomato, sunflower , grapes or cotton. In vitro and in vivo experiments have been carried out in order to study and reveal the modifications in strawberry leaf blade tissues and cells ultra-structure during the defense response to pathogen Botrytis cinerea induced by E1, E2 and E3 preparations of microbial origin. Leaves sampled from strawberry Research was supported by PNCDI II Research
The propagation by cuttings obtained from the stem is a frequently used way of vegetative multipl... more The propagation by cuttings obtained from the stem is a frequently used way of vegetative multiplication in the species of the Pelargonium genus. The purpose of this work is to highlight the changes induced in the internal structure of the vegetative organs by the crop’s substrate and by the growth promoters used for improving the rooting degree. Variations were observed in the number of layers of cells that make up the structure of tabular collenchyma from the stem’s structure, in the mesophyll’s thickness or in the degree of thickening of the cells’ walls.
Domnesti Village is located in the west of Bucharest, on the county road DJ 602. The village is m... more Domnesti Village is located in the west of Bucharest, on the county road DJ 602. The village is made up of two places: Domneș ti where the administrative center and village Teghes. It is bordered to the north-west of the village Ciorogarla southwest of Giurgiu County is Clinceni southeast and northeast Bragadiru City and Bucharest. A big advantage is the proximity of the village shopping area in west Bucharest, about 2-3 km away. In this area of pedological study was conducted in order to identify morphological, physical and chemical properties of soil area. The area studied, 16.9 hectares private property, is divided into two bodies: the first S1 S2 10.9 hectares and 6.0 hectares second. The purpose of the studies conducted in the area was establishing productive potential of soils and their suitability for different crops, especially vegetables.
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2020
Urban agglomerations create extreme microclimates for plants, in which growth, development and su... more Urban agglomerations create extreme microclimates for plants, in which growth, development and survival means adaptation. Plantations expansions beyond the typical gardens to buildings, walls or other build structures were realized in many cities with a rigorous selection of plant species. Although the number of woody species well adapted to the urban environmental conditions is quite large, few species manage to grow and develop on the roofs. Two species - Vinca major ‘Variegata’ and Hedera helix, regularly used for this type of plantations in Bucharest, were selected to understand their mechanism of adaptation. A comparative study was conducted on these species, growing on a rooftop garden and at the ground level into a typical garden. Both species revealed considerable anatomical differences of the leaves. In addition, physiological determinations revealed a stronger intensity of photosynthesis, an intense transpiration and a lower respiration rate at plants grown in the roof gar...
Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, Jan 7, 2017
The present study aims to evaluate the potential uses of hydroalcoholic extracts obtained from Ro... more The present study aims to evaluate the potential uses of hydroalcoholic extracts obtained from Romanian native wild-growing plants. The hydroalcoholic extracts were obtained from the burdock roots and respectively the aerial parts of birdeye speedwell. The extracts were characterised by HPLC (quantifying 13 compounds in the V. persica extract, 6 compounds in the A. lappa extract and confirming the presence of arctiin and arctigenin in the burdock extract). The antioxidant potential of the crude extracts was evaluated using two methods: the DPPH assay (79.91% for speedwell extract, 76.23% for burdock extract) and the phosphomolybdate method (296.5 mg/g ascorbic acid equivalents for burdock, 324.4 mg/g for speedwell). The crude extracts were found to be active against both fungal lines used (Aspergillus niger and Penicillium hirsutum), inhibition zones - 17.1 mm and 13.1 mm against P. hirsutum, respectively ca. 22 mm for both extracts against A. niger. The cytogenetic effects (assesse...
Agriculture and Agricultural Science Procedia, 2016
Acta Horti Botanici Bucurestiensis, 2013
The Plopul salt marshes, Tulcea County, developed within the perimeter of Lake Beibugeac, have be... more The Plopul salt marshes, Tulcea County, developed within the perimeter of Lake Beibugeac, have been identified as having a high concentration of halophytes on a relatively small area of about 100 ha. These have formed vegetal communities that fit within two types of Natura 2000 habitats: 1310 Communities of Salicornia and other annuals colonising mud and sand and 1530* Pannonic salt steppes and salt marshes. Four of the 57 species recorded are rare at national level: Halocnemum strobilaceum, Limonium bellidifollium subsp. danubiale, Limonium meyeri and Salicornia prostrata. The area currently has a SPA (Special Protection Area) status, but the unique concentration of halophytes, the presence of Natura 2000 habitats and of rare species, also recommend the area for designation as a SCI (Sites of Community Interest).
Variability studies of weeds in agricultural fields are useful in promoting integrated management... more Variability studies of weeds in agricultural fields are useful in promoting integrated management measures. It was found that a higher variability of any species can be controlled more easily by various methods. And if C.intybus species was a significant spread in agricultural fields, while variability information they are fewer. Weed, being adapted white luvicsoil the south of the country has shown that inflorescence have diameters between 3 and 5 cm, with a ligulae flower number between 13 and 25 pieces. Their modal values were 3.8-4.0 cm in diameter and 15-16 ligulae flowers number in head (capitula). Fruit s (achene) were formed in a number between 1 and 15 in the head, with a length between 1.5 and 2.6 mm, and the width between 0.7 and 1.1 mm. Modal values of these dimensions of fruits were 7-9 pieces / head, with 1.9-2.0 length and 0.9 mm width. Correlations between the various characters showed positive
Pelargonium citrosum is much appreciated both due to increased rich and very beautiful appearance... more Pelargonium citrosum is much appreciated both due to increased rich and very beautiful appearance of the leaves and the strong scent that exudes the whole plant. It drew this perfume plant called mosquito plant. Recent research has shown, however, that this name is not justified in removing the effect of plant mosquito void. It is clear however that this fragrance because Pelargonium citrosum plants are used not only for decoration but also as a raw material in the food, cosmetic and pharmaceutical. Getting rich growth of plants and compact to serve both decorative purposes and as a raw material in the industries mentioned above was the objective of our research. The plants were obtained by cutting and then were applied to four different types of fertilizers. Plant growth and development was pursued both by macroscopic biometric measurements (diameter, height and weight of plant, no. of leaves) and microscopic analysis of tissue by incorporation of leaf lamina and petiole. The resul...
AgroLife Scientific Journal
Cypripedium genus is represented by 59 species and nothospecies (species of hybrid origin), mainl... more Cypripedium genus is represented by 59 species and nothospecies (species of hybrid origin), mainly distributed across North, Central and South America, Europe and Asia, but absent from Madagascar and Australia. The most important characteristic of this genus is their showy and large labellum, which transformed into the specific slipper-shaped, vividly coloured, inflated pouch. In Romania, the genus is represented by one species only, Cypripedium calceolus. The article contains the first description of a newly discovered population in Prahova County, as well as a complete illustration of a Cypripedium calceolus flower pollinated by a female bee of the Lasioglossum genus. The flowers are passive traps pollinated by bees of particular type and size. The article describes in detail different mimicry (deceit) pollination strategies employed by the orchid in order to exploit its insect pollinators (generalized food deception mimicry, shelter mimicry, nest/brood-site mimicry, rendezvous at...
Notulae Botanicae Horti Agrobotanici Cluj-Napoca
Historical gardens’ restoration is a complex process including not only built features of the lay... more Historical gardens’ restoration is a complex process including not only built features of the layout, but also vegetation. Climate changes, air pollution, new pests and other factors have an important impact on vegetation and make sometimes impossible to restore the garden to the original model. Therefore, vegetation restoration requires investigations, to establish the tendencies, dynamics and resilience of different species in the garden, and decisions to adopt sustainable solutions. Woody plants from Peleș Royal Castle Gardens (Sinaia, Romania) were investigated to reveal the diachronic transformations of the vegetation and to establish an objective starting point in garden restoration. Despite of decades of neglected maintenance, historical events and changes in building function, the garden has a considerable number of old valuable trees and shrubs. Woody plants located on terraces were in a significantly poorer condition compared with those planted on the lawn. Natural forest ...
Four local populations of Prunus domestica from Buzau -Pătârlagele city were analysed to evaluate... more Four local populations of Prunus domestica from Buzau -Pătârlagele city were analysed to evaluate the resistance to frost as well as the organogenesis process. To evaluate the frost resistance of the flower buds two moments were chosen -late February and first decade of April. In the first determination, more than 50% of the analysed buds showed different kinds of damage on flower components, while at the second determination most of the buds remaining on the branch were viable.Theevaluation of the flower organogenesis process carried out at the end of February revealed differences inthe stage of carpel development, while the rest of the floral organs were formed in all four populations
This is the first confirmed occurrence in Romania of a significant (notho)population of seven hyb... more This is the first confirmed occurrence in Romania of a significant (notho)population of seven hybrids, Anacamptis × timbali nothosubspecies reinhardii (Ugr. ex E.G. Camus) H. Kretzschmar, Eccarius & H. Dietr., 2007, hybrids between two highly divergent species, Anacamptis coriophora (from Anacamptis coriophora group) and Anacamptis palustris subsp. elegans (from Anacamptis palustris group). The seven hybrids, very likely F1 generation plants representing a single interspecific/intrageneric pollination event, were first studied at Grădiştea Muncelului-Cioclovina Natural Park, Hunedoara County, Romania. The hybrids were phenotypically intermediate between their parental species in most of the 25 morphometric and 41 morphological characters scored, but significantly, they closely resembled Anacamptis palustris subsp. elegans parent. Additionally, pollination studies were performed. Since the parental species occurred in near proximity (at less than 1 meter distance), we suggest that the production of this hybrid required a minimum travel distance of ca 1-10 meters, by the pollinators and frequent exchange of pollen between the parental species was very likely. The parental species A. coriophora and the hybrid, which display a considerable synchronicity in their flowering time, were proved to overlap in pollinator community, very successfully sharing the solitary bees belonging to genus Lasioglossum. The presence of fruits in almost all the hybrids is another proof that they were successfully crosspollinated. It is clear that even contrasting pollination syndromes such as generalized food deception (in the nectarless Anacamptis palustris subsp. elegans) and generalised food foraging behaviour (in the nectar-producing Anacamptis coriophora) mechanisms are insufficient to fully stop the gene flow between the two species. We set this hybrid population discovery in the context of the recent, expanding evidence of the occurrence of wild species of orchids in Grădiştea Muncelului-Cioclovina Natural Park.
Variability studies of weeds in agricultural fields are useful in promoting integrated management... more Variability studies of weeds in agricultural fields are useful in promoting integrated management measures. It was found that a higher variability of any species can be controlled more easily by various methods. And if C.intybus species was a significant spread in agricultural fields, while variability information they are fewer. Weed, being adapted white luvicsoil the south of the country has shown that inflorescence have diameters between 3 and 5 cm, with a ligulae flower number between 13 and 25 pieces. Their modal values were 3.8-4.0 cm in diameter and 15-16 ligulae flowers number in head (capitula). Fruit s (achene) were formed in a number between 1 and 15 in the head, with a length between 1.5 and 2.6 mm, and the width between 0.7 and 1.1 mm. Modal values of these dimensions of fruits were 7-9 pieces/ head, with 1.9-2.0 length and 0.9 mm width. Correlations between the various characters showed positive results, and that means the plant have a good adaptation to the various ve...
The four local populations of Prunus domestica, T1, T2, T3, respectively T4, selected for observa... more The four local populations of Prunus domestica, T1, T2, T3, respectively T4, selected for observations and measurements are distinguished by a series of particular attributes of fruit: one of the four populations matures their fruits early in August while the remaining populations are ripening during September; the endocarp is not adherent to the T3 population, whereas the remainder has different degrees of adhesion; the average weight of fruit varies clearly from species to species, and the ratio between fruit weight and fruit diameter is relatively close for the 3 populations; the sugar content, with one exception, is close to the average of 15.95, and the dry matter content is also variable depending on the population.
Seseli gigantissimum is a new taxon identified by Professor Vasile Ciocârlan in Şipote Valley (Co... more Seseli gigantissimum is a new taxon identified by Professor Vasile Ciocârlan in Şipote Valley (Constanta county). Were performed observations on anatomical peculiarities of the leaves of plants grown in the Botanical Garden of USAMVBucharest and were observed some peculiarity of the leaf rachis and ultimate segments that aren’t describes in morphological diagnosis.
Flora of grasslands, located at the base of hills around the Topolog commune, comprises important... more Flora of grasslands, located at the base of hills around the Topolog commune, comprises important species for diversity of vegetation in this area and, also, in our country: most of the species, of the thirty-six identified in the course of our reports, made in July-August, 2010-2012, have a limited area of distribution; eight species are rare in Romania and one of them – Campanula romanica S�� vul. - is an endemic one, found only in Dobrogea. According to the sozological categories, four species are considered vulnerable and two have endangered status.
Applied Sciences
Nowadays, intensive agriculture correlated with the impact of climate change has led to nutrient ... more Nowadays, intensive agriculture correlated with the impact of climate change has led to nutrient soil depletion and the salinization of agricultural lands, making them unsuitable for conventional agricultural crops, with a direct impact on the food industry. Therefore, it is necessary to find sustainable alternative solutions that satisfy the needs of both consumers and food production. One such solution may be represented by salt-tolerant species that can fulfill food requirements. One of the most promising salt-tolerant plant species that can be used is Salicornia europaea L. The present work was conducted in greenhouse conditions, and the adaptability of the species on different cultivation substrates was investigated by means of monitoring the plant indicators such as cuticle, epidermis, parenchyma, polyphenols content, and minerals. Moreover, the correlation between the polyphenol and mineral contents was highlighted. Therefore, three cultivation substrates with different level...
Orchidaceae is the second largest families of flowering plants. There are approximately 900 orchi... more Orchidaceae is the second largest families of flowering plants. There are approximately 900 orchid genera comprising between 28,000-32,000 species of orchids. The relationship between orchids and mankind is complex. The history of orchids' discovery goes hand in hand with the history of humanity, encompassing discovery and adventure, witchcraft and magic, symbolism and occultism, addiction and sacrifice, lust and wealth. Historically, the Chinese were the first to cultivate orchids as medicinal plants, more than 4000 years ago. Gradually, records about orchids spread, reaching the Middle East and Europe. Around 300 B.C., Theophrastus named them for the first time orkhis. In 1737, Carl Linnaeus first used the word Orchidaceae to designate plants with similar features. The family name, Orchidaceae was fully established in 1789, by Antoine Laurent de Jussieu. In 1862, Charles Darwin published the first edition of his book, Fertilisation of Orchids. Darwin considered the adaptations of orchid flowers to their animal pollinators as being among the best examples of his idea of evolution through natural selection. Orchidology was on its way. During the 18th and the 19th centuries, orchids generated the notorious Orchid Fever where orchid-hunters turned the search for orchids into a frantic and obsessive hunt. Ever since, orchids have conquered the world, becoming a much-desired, multibillion-dollar commodity.
The purpose of this study was to reveal by optical microscopy and ultra-microscopy the changes in... more The purpose of this study was to reveal by optical microscopy and ultra-microscopy the changes induced in the cells and tissues of strawberry plants by different treatments with elicitors obtained from fungal strains to activate various metabolic pathways involved in the defense response of plants against pathogens. The diseases control is generally based on use of chemical pesticides, genetic resistant plant species and adequate agro-technical measures. Environment pollution with pesticide residues and the long period necessary to obtain genetic resistance in crop plants led to finding strategies based on inducing plant defense mechanism by appropriate stimuli. Thus, research has demonstrated the possibility to induce plant resistance to various pathogens from genera Fusarium, Plasmopara, Verticillium, Erwinia, Pseudomonas. Attempts have been done to assess the morphological and biochemical basis of resistance in plants of tomato, sunflower , grapes or cotton. In vitro and in vivo experiments have been carried out in order to study and reveal the modifications in strawberry leaf blade tissues and cells ultra-structure during the defense response to pathogen Botrytis cinerea induced by E1, E2 and E3 preparations of microbial origin. Leaves sampled from strawberry Research was supported by PNCDI II Research
The propagation by cuttings obtained from the stem is a frequently used way of vegetative multipl... more The propagation by cuttings obtained from the stem is a frequently used way of vegetative multiplication in the species of the Pelargonium genus. The purpose of this work is to highlight the changes induced in the internal structure of the vegetative organs by the crop’s substrate and by the growth promoters used for improving the rooting degree. Variations were observed in the number of layers of cells that make up the structure of tabular collenchyma from the stem’s structure, in the mesophyll’s thickness or in the degree of thickening of the cells’ walls.
Domnesti Village is located in the west of Bucharest, on the county road DJ 602. The village is m... more Domnesti Village is located in the west of Bucharest, on the county road DJ 602. The village is made up of two places: Domneș ti where the administrative center and village Teghes. It is bordered to the north-west of the village Ciorogarla southwest of Giurgiu County is Clinceni southeast and northeast Bragadiru City and Bucharest. A big advantage is the proximity of the village shopping area in west Bucharest, about 2-3 km away. In this area of pedological study was conducted in order to identify morphological, physical and chemical properties of soil area. The area studied, 16.9 hectares private property, is divided into two bodies: the first S1 S2 10.9 hectares and 6.0 hectares second. The purpose of the studies conducted in the area was establishing productive potential of soils and their suitability for different crops, especially vegetables.
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2020
Urban agglomerations create extreme microclimates for plants, in which growth, development and su... more Urban agglomerations create extreme microclimates for plants, in which growth, development and survival means adaptation. Plantations expansions beyond the typical gardens to buildings, walls or other build structures were realized in many cities with a rigorous selection of plant species. Although the number of woody species well adapted to the urban environmental conditions is quite large, few species manage to grow and develop on the roofs. Two species - Vinca major ‘Variegata’ and Hedera helix, regularly used for this type of plantations in Bucharest, were selected to understand their mechanism of adaptation. A comparative study was conducted on these species, growing on a rooftop garden and at the ground level into a typical garden. Both species revealed considerable anatomical differences of the leaves. In addition, physiological determinations revealed a stronger intensity of photosynthesis, an intense transpiration and a lower respiration rate at plants grown in the roof gar...
Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, Jan 7, 2017
The present study aims to evaluate the potential uses of hydroalcoholic extracts obtained from Ro... more The present study aims to evaluate the potential uses of hydroalcoholic extracts obtained from Romanian native wild-growing plants. The hydroalcoholic extracts were obtained from the burdock roots and respectively the aerial parts of birdeye speedwell. The extracts were characterised by HPLC (quantifying 13 compounds in the V. persica extract, 6 compounds in the A. lappa extract and confirming the presence of arctiin and arctigenin in the burdock extract). The antioxidant potential of the crude extracts was evaluated using two methods: the DPPH assay (79.91% for speedwell extract, 76.23% for burdock extract) and the phosphomolybdate method (296.5 mg/g ascorbic acid equivalents for burdock, 324.4 mg/g for speedwell). The crude extracts were found to be active against both fungal lines used (Aspergillus niger and Penicillium hirsutum), inhibition zones - 17.1 mm and 13.1 mm against P. hirsutum, respectively ca. 22 mm for both extracts against A. niger. The cytogenetic effects (assesse...
Agriculture and Agricultural Science Procedia, 2016
Acta Horti Botanici Bucurestiensis, 2013
The Plopul salt marshes, Tulcea County, developed within the perimeter of Lake Beibugeac, have be... more The Plopul salt marshes, Tulcea County, developed within the perimeter of Lake Beibugeac, have been identified as having a high concentration of halophytes on a relatively small area of about 100 ha. These have formed vegetal communities that fit within two types of Natura 2000 habitats: 1310 Communities of Salicornia and other annuals colonising mud and sand and 1530* Pannonic salt steppes and salt marshes. Four of the 57 species recorded are rare at national level: Halocnemum strobilaceum, Limonium bellidifollium subsp. danubiale, Limonium meyeri and Salicornia prostrata. The area currently has a SPA (Special Protection Area) status, but the unique concentration of halophytes, the presence of Natura 2000 habitats and of rare species, also recommend the area for designation as a SCI (Sites of Community Interest).
Variability studies of weeds in agricultural fields are useful in promoting integrated management... more Variability studies of weeds in agricultural fields are useful in promoting integrated management measures. It was found that a higher variability of any species can be controlled more easily by various methods. And if C.intybus species was a significant spread in agricultural fields, while variability information they are fewer. Weed, being adapted white luvicsoil the south of the country has shown that inflorescence have diameters between 3 and 5 cm, with a ligulae flower number between 13 and 25 pieces. Their modal values were 3.8-4.0 cm in diameter and 15-16 ligulae flowers number in head (capitula). Fruit s (achene) were formed in a number between 1 and 15 in the head, with a length between 1.5 and 2.6 mm, and the width between 0.7 and 1.1 mm. Modal values of these dimensions of fruits were 7-9 pieces / head, with 1.9-2.0 length and 0.9 mm width. Correlations between the various characters showed positive
Pelargonium citrosum is much appreciated both due to increased rich and very beautiful appearance... more Pelargonium citrosum is much appreciated both due to increased rich and very beautiful appearance of the leaves and the strong scent that exudes the whole plant. It drew this perfume plant called mosquito plant. Recent research has shown, however, that this name is not justified in removing the effect of plant mosquito void. It is clear however that this fragrance because Pelargonium citrosum plants are used not only for decoration but also as a raw material in the food, cosmetic and pharmaceutical. Getting rich growth of plants and compact to serve both decorative purposes and as a raw material in the industries mentioned above was the objective of our research. The plants were obtained by cutting and then were applied to four different types of fertilizers. Plant growth and development was pursued both by macroscopic biometric measurements (diameter, height and weight of plant, no. of leaves) and microscopic analysis of tissue by incorporation of leaf lamina and petiole. The resul...
AgroLife Scientific Journal
Cypripedium genus is represented by 59 species and nothospecies (species of hybrid origin), mainl... more Cypripedium genus is represented by 59 species and nothospecies (species of hybrid origin), mainly distributed across North, Central and South America, Europe and Asia, but absent from Madagascar and Australia. The most important characteristic of this genus is their showy and large labellum, which transformed into the specific slipper-shaped, vividly coloured, inflated pouch. In Romania, the genus is represented by one species only, Cypripedium calceolus. The article contains the first description of a newly discovered population in Prahova County, as well as a complete illustration of a Cypripedium calceolus flower pollinated by a female bee of the Lasioglossum genus. The flowers are passive traps pollinated by bees of particular type and size. The article describes in detail different mimicry (deceit) pollination strategies employed by the orchid in order to exploit its insect pollinators (generalized food deception mimicry, shelter mimicry, nest/brood-site mimicry, rendezvous at...
Notulae Botanicae Horti Agrobotanici Cluj-Napoca
Historical gardens’ restoration is a complex process including not only built features of the lay... more Historical gardens’ restoration is a complex process including not only built features of the layout, but also vegetation. Climate changes, air pollution, new pests and other factors have an important impact on vegetation and make sometimes impossible to restore the garden to the original model. Therefore, vegetation restoration requires investigations, to establish the tendencies, dynamics and resilience of different species in the garden, and decisions to adopt sustainable solutions. Woody plants from Peleș Royal Castle Gardens (Sinaia, Romania) were investigated to reveal the diachronic transformations of the vegetation and to establish an objective starting point in garden restoration. Despite of decades of neglected maintenance, historical events and changes in building function, the garden has a considerable number of old valuable trees and shrubs. Woody plants located on terraces were in a significantly poorer condition compared with those planted on the lawn. Natural forest ...
Four local populations of Prunus domestica from Buzau -Pătârlagele city were analysed to evaluate... more Four local populations of Prunus domestica from Buzau -Pătârlagele city were analysed to evaluate the resistance to frost as well as the organogenesis process. To evaluate the frost resistance of the flower buds two moments were chosen -late February and first decade of April. In the first determination, more than 50% of the analysed buds showed different kinds of damage on flower components, while at the second determination most of the buds remaining on the branch were viable.Theevaluation of the flower organogenesis process carried out at the end of February revealed differences inthe stage of carpel development, while the rest of the floral organs were formed in all four populations
This is the first confirmed occurrence in Romania of a significant (notho)population of seven hyb... more This is the first confirmed occurrence in Romania of a significant (notho)population of seven hybrids, Anacamptis × timbali nothosubspecies reinhardii (Ugr. ex E.G. Camus) H. Kretzschmar, Eccarius & H. Dietr., 2007, hybrids between two highly divergent species, Anacamptis coriophora (from Anacamptis coriophora group) and Anacamptis palustris subsp. elegans (from Anacamptis palustris group). The seven hybrids, very likely F1 generation plants representing a single interspecific/intrageneric pollination event, were first studied at Grădiştea Muncelului-Cioclovina Natural Park, Hunedoara County, Romania. The hybrids were phenotypically intermediate between their parental species in most of the 25 morphometric and 41 morphological characters scored, but significantly, they closely resembled Anacamptis palustris subsp. elegans parent. Additionally, pollination studies were performed. Since the parental species occurred in near proximity (at less than 1 meter distance), we suggest that the production of this hybrid required a minimum travel distance of ca 1-10 meters, by the pollinators and frequent exchange of pollen between the parental species was very likely. The parental species A. coriophora and the hybrid, which display a considerable synchronicity in their flowering time, were proved to overlap in pollinator community, very successfully sharing the solitary bees belonging to genus Lasioglossum. The presence of fruits in almost all the hybrids is another proof that they were successfully crosspollinated. It is clear that even contrasting pollination syndromes such as generalized food deception (in the nectarless Anacamptis palustris subsp. elegans) and generalised food foraging behaviour (in the nectar-producing Anacamptis coriophora) mechanisms are insufficient to fully stop the gene flow between the two species. We set this hybrid population discovery in the context of the recent, expanding evidence of the occurrence of wild species of orchids in Grădiştea Muncelului-Cioclovina Natural Park.
Variability studies of weeds in agricultural fields are useful in promoting integrated management... more Variability studies of weeds in agricultural fields are useful in promoting integrated management measures. It was found that a higher variability of any species can be controlled more easily by various methods. And if C.intybus species was a significant spread in agricultural fields, while variability information they are fewer. Weed, being adapted white luvicsoil the south of the country has shown that inflorescence have diameters between 3 and 5 cm, with a ligulae flower number between 13 and 25 pieces. Their modal values were 3.8-4.0 cm in diameter and 15-16 ligulae flowers number in head (capitula). Fruit s (achene) were formed in a number between 1 and 15 in the head, with a length between 1.5 and 2.6 mm, and the width between 0.7 and 1.1 mm. Modal values of these dimensions of fruits were 7-9 pieces/ head, with 1.9-2.0 length and 0.9 mm width. Correlations between the various characters showed positive results, and that means the plant have a good adaptation to the various ve...
The four local populations of Prunus domestica, T1, T2, T3, respectively T4, selected for observa... more The four local populations of Prunus domestica, T1, T2, T3, respectively T4, selected for observations and measurements are distinguished by a series of particular attributes of fruit: one of the four populations matures their fruits early in August while the remaining populations are ripening during September; the endocarp is not adherent to the T3 population, whereas the remainder has different degrees of adhesion; the average weight of fruit varies clearly from species to species, and the ratio between fruit weight and fruit diameter is relatively close for the 3 populations; the sugar content, with one exception, is close to the average of 15.95, and the dry matter content is also variable depending on the population.
Seseli gigantissimum is a new taxon identified by Professor Vasile Ciocârlan in Şipote Valley (Co... more Seseli gigantissimum is a new taxon identified by Professor Vasile Ciocârlan in Şipote Valley (Constanta county). Were performed observations on anatomical peculiarities of the leaves of plants grown in the Botanical Garden of USAMVBucharest and were observed some peculiarity of the leaf rachis and ultimate segments that aren’t describes in morphological diagnosis.
Flora of grasslands, located at the base of hills around the Topolog commune, comprises important... more Flora of grasslands, located at the base of hills around the Topolog commune, comprises important species for diversity of vegetation in this area and, also, in our country: most of the species, of the thirty-six identified in the course of our reports, made in July-August, 2010-2012, have a limited area of distribution; eight species are rare in Romania and one of them – Campanula romanica S�� vul. - is an endemic one, found only in Dobrogea. According to the sozological categories, four species are considered vulnerable and two have endangered status.