Sami Rabei | Damietta University (original) (raw)

Books by Sami Rabei

Schefflera arboricola (Araliaceae) was selected to study the effect of short term drought stress ... more Schefflera arboricola (Araliaceae) was selected to study the effect of short term drought stress and other environmental factors on water transport. Effects of photosynthetic photon flux density, relative humidity, temperature, and soil water potential were studied. Leaf water potential was not affected under drought stress; even at very low transpiration rate. Constant xylem water potential in S. arboricola could be a strategy to avoid leaf abscission. Stem diameter fluctuation was affected by decreasing soil water potential. Hydraulic resistance for water flow between the soil and leaves decreased in the beginning and after that increased with decreasing soil water potential. Internal structures of well irrigated and water stressed plants were generally the same except new formed leaves. Cuticle thickness, xylem vessels' area were affected. Number of druses, in water stressed plants, were higher than well-irrigated plants. Optimal growth of S. arboricola can corroborate with irrigation control which should be in balance between frequency and dose. Stem diameter fluctuations could be an accurate indicator of water status and can be used for optimal irrigation control.

The family Umbelliferae (Apiaceae) is one of the most famous botanical families. The medicinal an... more The family Umbelliferae (Apiaceae) is one of the most famous botanical families. The medicinal and aromatic species of this family have great economic export value for Egypt. 54 Egyptian Umbelliferous species were checked and their taxonomic characters (290 characters) were determined including: morphological, anatomical characters as well as their chromosome numbers in addition to their content from the flavonoids. Delta program is used to generate simplified taxonomic keys which enable the researchers and many other who interested on the identification of these species. This revision is based on the herbarium specimens kept in the herbaria of both Cairo and Reading Universities as well as specimens gathered from field. These species are sub-classified into 2 subfamilies (Saniculoideae and Apioideae) including 30 genera. Six conventional keys were elaborated for the identification of unknown Umbelliferae specimen. It is easy for expert and non expert in the taxonomy to use it. The present study recommended the starting a national wide program for the application of DELTA program to include another families and genera.

Papers by Sami Rabei

Scientific Journal for Damietta Faculty of Science

The pollen morphology of 36 woody species from the New Damietta City, Egypt. Belonging to 20 fami... more The pollen morphology of 36 woody species from the New Damietta City, Egypt. Belonging to 20 families of angiosperms, distributed in eighteen dicots and two monocots were investigated. The pollen grains were acetolysed, measured, described and illustrated under light microscopy (LM). Examination of these families revealed great pollen diversity in their qualitative and quantitative characters. The results revealed 58.3% of species with prolate-spheroidal pollen, 16.7% with oblatespheroidal pollen, 16.7% with subprolate pollen, 5.6% with prolate pollen and 2.7% with suboblate pollen. Tricolporate apertures accounted for almost half of apertures types; triporate, monocolpate, tricolpate, tetra-to penta-porate, tetraporate, pantoporate, inaperturate, tetracolporate and spiral aperture representing the remainder. Exine ornamentations ranged from psilate (33.3%), reticulate (27.7%) to micro-reticulate, scabrate, granulate, echinate each represents (2%) and clavate, verrucate, rugulate, striate, psilate-perforate, clavate-reticulate made up (1%) for each type. On the basis of pollen units, number and type of apertures, exine patterns were great diagnostic significance among the examined taxa. Six major pollen types and nine subtypes included in two groups (polyads and monads) were recognized. Description of pollen types, LM micrographs and a key for identification of the investigated taxa are provided.

Scientific Journal for Damietta Faculty of Science

The current study aims at investigating the morphology of pollen grain for eleven woody species o... more The current study aims at investigating the morphology of pollen grain for eleven woody species of Fabaceae cultivated in New Damietta, Egypt. The pollen grains were prepared according to Erdtman's acetolysis method, described and photographed using light microscopy (LM). The results showed variations in their qualitative and quantitative features. Differences in pollen shape (subprolate, prolate, prolate-spheroidal, oblate-spheroidal), size (medium to large), pollen arrangement (monads or polyads), amb (circular, irregular, elliptic or triangular), polarity (isopolar, heteropolar), type of apertures (porate, colporate, inaperturate) and exine ornamentation patterns (psilate, verrucate, granulate, reticulate and psilate-perforate) are characterized. Electrophoretic (SDS-PAGE) examination of total pollen protein content of four species (Acacia ehrenbergiana, Cassia glauca, Delonix regia, Leucaena leucocephala) revealed distinct protein bands. The results of this study is of great importance in understanding the pollen types of some allergy producing species.

Scientific Journal for Damietta Faculty of Science, 2019

The present work is addressed photosynthetic rate, growth rates and quantification of aquaporin g... more The present work is addressed photosynthetic rate, growth rates and quantification of aquaporin genes expression on sunflower plant to examine the expression and regulation profiles of some aquaporins, their role in regulating water transport during salt stress and their role in improving plant tolerance to stresses. The differential regulation of aquaporins might contribute to increased resistance/susceptibility to a specific stress, in a species-specific way. Aquaporins fine regulation helps plants maintain a positive water balance under detrimental environmental conditions. Both down-and up-regulation of aquaporin expression leading to changes in membrane permeability have been described and proposed to be beneficial for plants experiencing water deficit. Plants may decrease the water permeability of their cell membranes to avoid excessive loss of water from the root to the soil and / or aquaporins might play a role in stress avoidance by enhancing root water uptake, when the water potential gradient between soil and root xylem is still favorable. The contribution of both types of responses may depend on the plant species, the intensity and duration of the stress and aquaporin isoform. The salt tolerance is a complex trait but might be partly due to the expression of stress-inducible aquaporin isoforms. The plant shows different expression level of PIP1;5, PIP2;1, PIP2;3, TIP1;1 as well as different water transport activity..

Scientific Journal for Damietta Faculty of Science, 2015

Zea mays L. is less tolerant to drought than Sorghum bicolor L. In the present study, we investig... more Zea mays L. is less tolerant to drought than Sorghum bicolor L. In the present study, we investigated the response of both plants to drought stress applied under field conditions by withholding water for 10 d. The plant growth in terms of shoot fresh and dry weights was more severely reduced in maize than in sorghum as a result of drought stress, consistently with reduction of leaf relative water content (RWC). Gas exchange was also more greatly inhibited by drought in maize than in sorghum. As a result, the water use efficiency (WUE) of maize was fluctuated according to the time point during the day and in response to drought stress. In contrast, sorghum was able to maintain largely constant WUE during the day in the well-watered plants as well as under drought stress. This may indicate that sorghum was more efficiently controlled its water status in particular water uptake than did maize. Studying the expression of four aquaporin genes (PIP1;5, PIP1;6, PIP2;3 and TIP1;2) revealed that most of the genes responded weakly to drought stress except PIP2;3 which was highly responsive to drought in sorghum but not in maize roots, where it may have supported greater water uptake in sorghum, and thereby maintained higher leaf RWC in sorghum than in maize and hence could account at least in part for the drought tolerance of sorghum as compared to maize. The outcome of this study is that PIP2;3 may have role in drought tolerance and maintenance of the WUE of sorghum plants compared to those of maize.

Scientific Journal for Damietta Faculty of Science, 2016

Silene oreosinaica is a rare, endemic plant species in Saint Catherine protectorate. It was colle... more Silene oreosinaica is a rare, endemic plant species in Saint Catherine protectorate. It was collected for first time by Schimper in July 1835, and then it was collected in 1982 and 1983. Since this date, it could not be found and therefore there was no sufficient data about it. This paper aims to confirm the presence of Silene oreosinaica and gives sufficient data about its distribution, morphological description based on field observation, anatomical characteristics of stem and leaf, pollen grains and seed micromorphology.

Scientific Journal for Damietta Faculty of Science, 2013

Two wetland species namely Cyperus laevigatus L. and Cyperus articulatus L. were grown under diff... more Two wetland species namely Cyperus laevigatus L. and Cyperus articulatus L. were grown under different water levels and nutrient concentrations. For C. laevigatus, the highest value of plant height, biomass and survival were recorded when water level was at soil surface, while in C. articulatus grown under high nutrient treatment the total biomass was increased by the decrease of water level. Results showed a highly significant effect of water level on C. laevigatus density and biomass. Nutrient addition affected biomass and plant density, but interaction between Nutrient addition and water level affects plant height significantly. In case of C. articulatus Nutrient addition and water level showed significant variation on biomass and plant height. The highest Na + , K + , total-P and total-N contents in the above-grounds parts of both species were detected in plant grown under high nutrient medium and water level below soil surface. The obtained results will be useful for the optimal management of sedge plants in relation to water and soil of the Nile Delta wetlands.

Scientific Journal for Damietta Faculty of Science, 2020

Seven sites were surveyed for collecting samples of C4 and C3 plants of Poaceae family from aquat... more Seven sites were surveyed for collecting samples of C4 and C3 plants of Poaceae family from aquatic and terrestrial habitats. C4 plants include Saccharum sp., Saccharum spontaneum, Echinochloa stagnina, Echinochloa colona and Echinochloa crusgalli. C3 plants include Phragmite australis and Leersia hexandra. Morphological description and anatomical characteristics of culm and leaf were studied in the two habitat. Growth rate and anatomical features of studied species affected by altering habitat from aquatic to terrestrial habitat. Morphological and anatomical characters were recorded and the data were analyzed using Past Software V. Cluster analysis was done depending on morphological characters and anatomical characters separately. The relationship between the studied species depending on morphological characters different from that based on the anatomical characters. Also, the relationship between studied C3 and C4 species affected by altering the habitat from aquatic to terrestrial one.

Taeckholmia, 2021

Saint Katherine protectorate is one of the most floristically diverse spots in the Middle East. A... more Saint Katherine protectorate is one of the most floristically diverse spots in the Middle East. A field surveys, as well as critical revision of herbarium specimens, were carried out during 2013-2020 revealed that 430 taxa belonging to 283 genera and 62 families. The life-forms are classified into seven life forms with dominance of Therophytes (39%) followed by Chamaephyte (24.7%). Chorological study indicated that 52% of recorded taxa were monoregional native to Saharo-Arabian (29%), Irano-Turanian (10.39%), Mediterranean (7.4%), Sudanin (4%) while tropical and subtropical represented by (0.2%) only. 223 taxa were mono-regional, 127 taxa were bi-regional, while 16 taxa were endemic and Stenoendemic. Investigated taxa distributed in four microhabitats; terraces, slopes, gorges, and wadi bed the last two were the most diversity. The present study investigated that presence of Papaver somniferum is a new record to flora of Egypt, eight new records to Sinai and thirty four new records to the study area.

Taeckholmia, 2021

Eragrostis Wolf is considered one of the largest genera of family Gramineae (Poaceae). It is a co... more Eragrostis Wolf is considered one of the largest genera of family Gramineae (Poaceae). It is a cosmopolitan genus and represented in Egypt by 14 taxa. The species limits are often overlapping due to the wide range in variation within this genus. So, it is difficult to establish specific boundaries and diagnostic characters. The main goal of this work is to establish the limits and the diagnostic characters in the Egyptian taxa, using cluster analysis and principal coordinates analysis based on morphological characters. Interactive keys have been designed as an aid for online identification and looking for diagnostic characters. The morphological characters of Inflorescence, spikelets, panicle, glumes, palea keels and caryopsis are very important and necessary in the identification of the studied species. The results of coordinate analysis as well as UPGMA dendogram revealed that Egyptian Eragrostis species can be divided into 3 groups: group (A) includes: E. minor and E. cilianensis; group (B) includes E. tef, E. tenuifolia, E. sarmentosa, E. barrelieri, E. aegyptiaca and E. pilosa while group (C) includes E. aspera, E. ciliaris, E. japonica, E. lepida, E. tenella, and E. tremula. More research is needed to confirm the occurrence of several taxa in Egypt, such as Eragrostis purpurascens and E. nitida, which have been reported in some publications but are uncertain.

Journal of Medicinal Plants Studies, 2020

The flora of Masalata Natural Reserve (MNR) in the northWestern section of Libya, 90 km east of t... more The flora of Masalata Natural Reserve (MNR) in the northWestern section of Libya, 90 km east of the city of Tripoli was surveyed in terms of life forms and phytogeography. Distribution and abundance values of the recorded species were determined. A total 445 of flowering plants are identified, they are distributed in 249 genera and belonging 64 Families. Annuals are predominated life form (60.9%), while parasites are the lowest (0.22%). The mono-regional Mediterranean species constitute 62.02% of the other flora. Species which are primarily Mediterranean but in some cases bi-regional with 30.78% and pluri-regional account for 14.38%.

Environmental and Experimental Botany, 2021

This study aimed at determining the role of aquaporins (AQPs) in the anisohydric behavior of sunf... more This study aimed at determining the role of aquaporins (AQPs) in the anisohydric behavior of sunflower. Deactivation of AQPs by mercury revealed that they could play vital role in the stomatal regulation and this role was not time-dependent under the control conditions. Sunflower seedlings were exposed to drought or to osmotic or ionic factor of NaCl and KCl. Under control and optimal conditions, sunflower leaves behaved in an anisohydric manner (maintaining high stomatal conductance (g s) at 13:00 compared to 9:00). At 13:00: 1) the upregulation of PIP1;1 could improve the mesophyll conductance to CO 2 , leading to enhancement of the photosynthetic rate (A) and consequently increasing the g s and 2) PIP2s were downregulated in the leaves, perhaps to decrease the hydraulic conductance and control excess water loss via transpiration but at the same time these genes were upregulated in the roots to improve root to leaf hydraulic conductance and maintain the positive water balance of the whole plant. Under drought, the decrease in g s and A at 13:00 could imply a shift towards near-isohydric behavior. The downregulation of PIP1s and further downregulation of PIP2s could indicate their involvement in this shift by decreasing CO 2 permeability and avoiding the possible loss of water from the plant roots to soil, respectively. The anisohydric behavior of leaves treated with KCl, but not NaCl, (25 or 150 mM) could be due to the positive impact of K + on stomata and the regulation of PIP1s and PIP2s. The anisohydric behavior could be achieved by a synchronized regulation of leaf and root AQPs.

Plant Molecular Biology Reporter, 2020

Saint Katherine Protectorate (SKP) hosts 24% of Egyptian Silene species including the endemic one... more Saint Katherine Protectorate (SKP) hosts 24% of Egyptian Silene species including the endemic ones. This study investigated five Silene species representing 17% of all Egyptian Silene; three of them are endemic to Egypt (S. oreosinaica, S. leucophylla, and S. schimperiana). S. schimperiana was widely distributed in different areas in SKP, whereas S. oreosinaica was very rare and was spotted as two or three populations restricted to one habitat. Moreover, S. oreosinaica has not been recorded before this study since 1983. Phylogenies based on pollen micromorphology as well as on molecular data were constructed in order to describe the evolutionary relationship among these species leading to their distribution. Although phylogeny based on the pollen grain characteristics was resulted in the separation of Silene species into two groups, the first one included S. odontopetala subsp. congesta Boiss and S. oreosinaica with sub-clade included S. schimperiana and the second group included S. linearis and S. leucophylla, there was no obvious relationship among these species in the light of their distribution. Neighbor-joining (NJ) and unweighted pair group method with arithmetic mean (UPGMA) phylogenies showed that Silene species were divided into three clades; the first one included S. oreosinaica and S. odontopetala, which were closely related; the second one included S. schimperiana and S. linearis; and the last clade had S. leucophylla. According to NJ phylogeny and principal coordinate analysis (PCoA), S. schimperiana has recent, evolutionary characters that could make it distantly related to the other species, suggesting that its wide distribution could be attributed to the adaptation of its genetic constitute to different conditions.

TAXON, 2019

stage of plant taxonomy in China. Most unfortunately, the type of H. hui, deposited at the herbar... more stage of plant taxonomy in China. Most unfortunately, the type of H. hui, deposited at the herbarium of the Botanical Museum Berlin-Dahlem (B), was destroyed in 1943. However, an image of the type specimen taken by Mr. Qin Renchang in the 1930s is fortunately available now (Institute of Botany Chinese Academy of Sciences, 1959!). Since H. caudatifolia is currently used in much literature, and H. hui has not appeared in any other literature since its publication, I here propose to conserve, under Art. 14 of the ICN, the later heterotypic name H. caudatifolia against H. hui. This is the best choice to avoid eventual disadvantageous nomenclatural change for a well-established name, and thus to preserve nomenclatural stability.

Journal of Plant Production, 2015

A survey was made to record the most of common weeds in the study area as well as the dominant, a... more A survey was made to record the most of common weeds in the study area as well as the dominant, associated and rare species. Five sites were selected for this survey, random sample of weeds, fixing and making herbarium sheets for these weeds and deposited them in Herbarium of Botany Department, Faculty of Science, Damietta University. Furthermore, the characteristics of the soil were these weeds growing in the orchards of new Damietta were analyzed. The most habitat types in the study area were namely, orchards, sandy fertile cultivated lands, banks of irrigation canals, reclaimed lands and waste lands. 60 wed species related to 23 families most of them are annuals, some hemicrytophytes and few perennials. The recorded species were formed monocots and dicots, with Poaceae(13 species) was the most represented family followed by Asteraceae(10 species). Chorological analysis of the recorded species indicated that the Mediterranean weed species extending into the Euro-Siberian territory attained higher occurrence in the study area as compared to those species with Saharo indian extension. Shannon and Simpson diversity index of site П was the most diverse site while the least diverse was site Ш. It's mean that there variety of species in site П compared with the rest of sites so, thus means that this site is a suitable field for growing a high no. of species. The most important soil variables controlling the distribution and richness of weed species were: soil texture, porosity, water-holding capacity, organic carbon, conductivity, calcium carbonates, chlorides and potassium, sodium and calcium cat ions. Soil pH, water holding capacity, calcium carbonates and soil bicarbonates as the best set of predict or variables of the weed species distribution in the study area. The obtained results will be useful for the determination of weeds of national significance. This approach was used to focus on the key species and make an extensive research on them. Most of these weeds remain significant problem at orchards and field crops. Results will be useful for optimum management of the noxious weeds in orchards.

Egyptian Journal of Botany, 2018

C linopodium serpyllifolium subsp. barbatum (Lamiaceae) and datura ferox (Solanaceae) have been r... more C linopodium serpyllifolium subsp. barbatum (Lamiaceae) and datura ferox (Solanaceae) have been recorded for the first time from Egypt. Both taxa were found in the mountainous region of Saint Katherine Protected Area, South Sinai. Morphological description and photos were given. Herbarium voucher was kept at related Herbaria.

Biologia plantarum, 2016

Zea mays L. is less tolerant to drought than Sorghum bicolor L. In the present study, we investig... more Zea mays L. is less tolerant to drought than Sorghum bicolor L. In the present study, we investigated the response of both plants to drought stress applied under field conditions by withholding water for 10 d. The plant growth in terms of shoot fresh and dry masses was more severely reduced in maize than in sorghum, consistently with reduction of leaf relative water content. Gas exchange was also more inhibited by drought in maize than in sorghum. The water use efficiency (WUE) of maize fluctuated during the day and in response to the drought stress. In contrast, sorghum was able to maintain a largely constant WUE during the day in the well-watered plants as well as in the stressed ones. Studying the expression of four aquaporin genes (PIP1;5, PIP1;6, PIP2;3, and TIP1;2) revealed that PIP1;5 in leaves and PIP2;3 in roots were highly responsive to drought in sorghum but not in maize, where they might have supported a greater water transport. The expression pattern of PIP1;6 suggests its possible role in CO 2 transport in control but not droughty leaves of both the plants. TIP1;2 seemed to contribute to water transport in leaves of the control but not droughty plants. We conclude that PIP1;5 and PIP2;3 may have a prominent role in drought tolerance and maintenance of WUE in sorghum plants.

African Journal of Biological Sciences, 2014

Scientific Journal for Damietta Faculty of Science

Scientific Journal for Damietta Faculty of Science, 2019

Scientific Journal for Damietta Faculty of Science, 2015

Scientific Journal for Damietta Faculty of Science, 2016

Scientific Journal for Damietta Faculty of Science, 2013

Scientific Journal for Damietta Faculty of Science, 2020

Taeckholmia, 2021

Journal of Medicinal Plants Studies, 2020

Environmental and Experimental Botany, 2021

Plant Molecular Biology Reporter, 2020

TAXON, 2019

Journal of Plant Production, 2015

Egyptian Journal of Botany, 2018

Biologia plantarum, 2016

Zea mays L. is less tolerant to drought than Sorghum bicolor L. In the present study, we investig... more Zea mays L. is less tolerant to drought than Sorghum bicolor L. In the present study, we investigated the response of both plants to drought stress applied under field conditions by withholding water for 10 d. The plant growth in terms of shoot fresh and dry masses was more severely reduced in maize than in sorghum, consistently with reduction of leaf relative water content. Gas exchange was also more inhibited by drought in maize than in sorghum. The water use efficiency (WUE) of maize fluctuated during the day and in response to the drought stress. In contrast, sorghum was able to maintain a largely constant WUE during the day in the well-watered plants as well as in the stressed ones. Studying the expression of four aquaporin genes (PIP1;5, PIP1;6, PIP2;3, and TIP1;2) revealed that PIP1;5 in leaves and PIP2;3 in roots were highly responsive to drought in sorghum but not in maize, where they might have supported a greater water transport. The expression pattern of PIP1;6 suggests its possible role in CO 2 transport in control but not droughty leaves of both the plants. TIP1;2 seemed to contribute to water transport in leaves of the control but not droughty plants. We conclude that PIP1;5 and PIP2;3 may have a prominent role in drought tolerance and maintenance of WUE in sorghum plants.

African Journal of Biological Sciences, 2014

A Morphometric taxonomical study has been conducted on 52 date palm cultivars (Phoenix dactylifer... more A Morphometric taxonomical study has been conducted on 52 date palm cultivars (Phoenix dactylifera L.) including 21 soft, 10 semi-dry and 21 dry cultivars based on one hundred and three morphological characters. The date were analyzed using multivariate statistical methods, Unweigheted pair Group Arithemetic-average (UPGMA), Weighted Group-average Sorting (WPGMA) and Increment-in-sum of Squares Flexible Sorting (ISS). UPGMA, WPGMA and ISS were separated the 52 date palm cultivars to 7 soft, 6 dry and 1 semi-dry, as well as fused nineteen pair of date palm cultivars. The present study indicated that the used analytical methods (UPGMA, WPGMA and ISS) are suitable for classification of date palm cultivars.