Ecophysiological aspects of the seed and seedling of Raulinoa echinata (Rutaceae), a species endemic to the riparian forests of Itajaí valley, SC, Brazil (original) (raw)
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The aim of this study was to evaluate the identification and floristic composition of seedlings of tree species, located in the soil seed bank of a remnant of the Dense Ombrophilous Forest of the Lowlands, in the Northeast of Brazil, from a morphofunctional ecology standpoint. A hundred and fifty two soil samples (0.2 m x 0.15 m x 0.05 m) were taken from a forest remnant, stored in polyethylene bags, identified and then taken to the Forest Nursery at the Federal Rural University of Pernambuco, where they were placed in polyethylene boxes under a 70% shade cloth and evaluated daily for a period of seven months. The seedlings emerged were photographed, separated into morphospecies, identified at the family and gender level and, when possible, at the species level. The density and absolute frequency, as well as the successional and morphological classification of the seedling cotyledons were estimated. In total, 1,577 seedlings of 31 morphospecies were cataloged. Melastomataceae was th...
Ciência Florestal, 2017
The altitude swamps in northeast Brazil are areas with divergent microclimates from the context that they are located; their forest formations are disjunctions of the Atlantic Forest, marooned by the ‘Caatinga’ vegetation, a condition that makes these remaining areas with high biodiversity. Botanical research in remnants forests of Paraíba state, particularly with regard to the redemption of germplasm, are relevant. The aim of this study was to evaluate the ecophysiology of seeds from native species of the Fabaceae family selected in the CCHSA forest fragment, submitted to thermal stress and monitor their reproductive phenophases. The experiment was conducted at the Seed Laboratory of the CCHSA/UFPB and with the aid of B.O.D germinators, with 8 hours of photoperiod in a randomized experiment design with constant temperatures of 20, 25, 30 and 40°C. The seeds were distributed on a paper towel moistened with distilled water equivalent to three times the weight of the dry paper. Four r...
2011
Ecophysiological aspects of the seed and seedling Ecophysiological aspects of the seed and seedling Ecophysiological aspects of the seed and seedling Ecophysiological aspects of the seed and seedling Ecophysiological aspects of the seed and seedling of of of of of Raulinoa echinata Raulinoa echinata Raulinoa echinata Raulinoa echinata Raulinoa echinata (Rutaceae), a species endemic (Rutaceae), a species endemic (Rutaceae), a species endemic (Rutaceae), a species endemic (Rutaceae), a species endemic to the riparian forests of Itajaí valley, SC, Brazil to the riparian forests of Itajaí valley, SC, Brazil to the riparian forests of Itajaí valley, SC, Brazil to the riparian forests of Itajaí valley, SC, Brazil to the riparian forests of Itajaí valley, SC, Brazil Aspectos ecofisiológicos da semente e da plântula de Raulinoa echinata (Rutaceae), espécie endêmica da vegetação ciliar do vale do Itajaí, SC, Brasil
Journal of Tropical …, 1999
The morphology of Genipa americana seeds and post-seminal development was studied, and its germination response investigated in relation to storage in water, substrate water volume, osmotic potential and temperature and light regimes. The seeds are flattened and seedlings are phaneroepigeal with leafy cotyledons. Seeds stored in water kept viable for up to 6 mo, but germination and seedling emergence were reduced after 4 mo. Germination was not affected under water-logged conditions, but seedling emergence was reduced at the water volume corresponding to a water column two times deeper than the seeds' mean thickness (70 ml). When seeds were osmotically stressed, a reduction in the rate and germination percentage occurred at −0.2 MPa and germination was drastically inhibited at-0.6 MPa. Seeds germinated in a wide range of temperatures (15-40°C), with optimum at continuous temperatures of 25 and 30°C. Light was not required for germination, and no dormancy mechanisms were observed. The seed and seedling morphology and the germinative responses of the species may permit its regeneration in periodically flooded lowland forests and riparian habitats and are probably key factors in explaining the species' wide distribution.
Journal of Seed Science, 2014
A technological approach to the morphofunctional classification of forest species seedlings defines the essential structures in the evaluation of germination testing and identifies changes in this structures that suggest abnormalities. The objective was to associate morphofunctional seedling classification to seed germination testing using official germination methods for 50 forest species from Amazon, Caatinga, Cerrado, Atlantic Forest and Pantanal biomes. Morphofunctional classification and abnormalities were defined using seedlings from 232 germination pre-tests and 1,160 samples that were formed for each species using seeds from distinct locations and with at least three levels of vigor. The phanero-epigeal germination with a non-developed epicotyl predominated among species (84%). Common in hypogeal germination, the development of the epicotyl occurred only in seedlings of Anadenanthera colubrina and Erythrina speciosa, both with epigeal germination. The need to supply and sust...
Revista Brasileira de Botânica, 1999
recebido em 26/03/98; aceito em 2/01/99) ABSTRACT -(Number of buried seeds and seedlings emergence in cerradão, cerrado and gallery forest soils at Pedregulho, Itirapina (SP), Brazil). This study was carried out at the site named Pedregulho in the "Estação Experimental de Itirapina", Itirapina, state of São Paulo, Brazil. Soil samples were collected in the rainy and in the dry season at three depths in the gallery forest, cerrado and cerradão. The total number of seeds was counted after being separated from the soil by wet sieving and the number of viable seeds was determined by emergence of seedlings in soil samples in a greenhouse. The number of seeds and of emerged seedlings decreases as soil samples become deeper. The number of seeds was much larger in the cerrado in the dry season than in the rainy season, but it was lower in the dry than in the rainy season in the gallery forest. The number of seeds in the cerradão was similar in both seasons. There was a heavy discrepancy between the total number of seeds and that of emerged seedlings.
Germination Patterns and Seed Longevity of Monocotyledons from the Brazilian Campos Rupestres
The Brazilian campos rupestres vegetation is associated with the Espinhaço Mountain chain, a region recently declared a Biosphere Reserve by UNESCO, in recognition of its high diversity and large numbers of endemic species. The campos rupestres vegetation typically occupies exposed rocky areas, sandy plains, and swamps, at above 900 meters, and is generally composed of a mix of herbaceous plants and sparse shrubs and subshrubs. The proposal of this study was to present a revision of the biometry, germination behavior, and longevity of the seeds of four families of monocotyledons occurring in the campos rupestres. The family Bromeliaceae is widely distributed in Brazil, while Eriocaulaceae, Xyridaceae, and Velloziaceae are quite abundant in the campos rupestres of the Espinhaço Mountains. The seeds of all the species analyzed were small, with average lengths of 0.6-2.6 mm and average dry weights of 0.0019-0.49 mg. The seeds of the Bromeliaceae are generally aphotoblastic, while those of Eriocaulaceae, Xyridaceae, and Velloziaceae are positive photoblastic. In general, the seeds demonstrate high germination rates over a wide range of temperatures (most will germinate between 15-35°C). The analysis of seed longevity in the soil indicated that, except for the Bromeliaceae, all of the species examined maintained their viability in the soil for more than a year and thus had the potential to form persistent soil seed banks. The persistence of these seeds in the soil is related to their small size and to light requirements for germination -characteristics that contribute to successful recruitment in open environments like the campos rupestres, with high solar radiation levels and wide temperature fluctuations.
BRAZILIAN JOURNAL OF AGRICULTURE - Revista de Agricultura, 2018
O objetivo foi avaliar características morfométricas de sementes, germinação e crescimento inicial de plântulas de seis espécies pertencente a família Lamiaceae, endêmicas da região semiárida do nordeste brasileiro e ainda pouco estudadas. Foram obtidos peso, comprimento, largura e conteúdo de água das sementes de Martianthus leucocephalus, Hyptis suaveolens, H. macrostachys, H. platanifolia, Eplingiella fruticosa e E. cuniloides e comparado o efeito da temperatura na germinação e no crescimento inicial de plântulas das três espécies de Hyptis. As Sementes mostraram grande variabilidade; alguns parâmetros podem ser utilizados para fins de identificação de espécies. Sementes de Martianthus leucocephalus apresentaram menores médias para comprimento e largura, enquanto que as maiores medidas forma observadas em H. suaveolens. As temperaturas entre 25 e 30 oC foram as que proporcionaram as maiores porcentagens de germinação e obtenção de plântulas vigorosas. Dentre as espécies estuda...
Germination of seeds from herbaceous plants artificially stored in cerrado soil
Revista Brasileira de Biologia, 1999
The germination of three cerrado herbaceous species: Bidens gardneri, Vernonia herbacea (Asteraceae) and Psychotria barbiflora (Rubiaceae) was studied using seeds stored in cerrado soil and in refrigerator at 4°C. The field experiment was carried out at a preserved area of cerrado, the Reserva Biológica e Estação Experimental de Mogi-Guaçu, State of São Paulo, Brazil. The soil was collected in the same cerrado where the experiment was carried out. The achenes of Bidens gardneri are light sensitive, but this sensitivity disappeared when the achenes were stored in soil. With 3 months storage in cerrado soil no differences in germination in light or darkness were detected. The number of intact achenes retrieved from storage in soil decreased with increasing time of storage. A large number of seeds had already germinated during the 3 months storage in soil. The longevity of seeds of this species stored for nearly 10 years at 4°C was checked: the achenes were viable for a long period of time but less than 10 years. Intact achenes of Vernonia herbacea could be retrieved from the soil only with 1 month storage. Germination was always very low and only 15% of the achenes possessed embryos. The number of intact seeds of Psychotria barbiflora decreased the longer the period of storage in soil. Germination of seeds stored at 4°C or in the soil was always very low. From the germination studies of stored seeds in cerrado it can be concluded that Vernonia herbacea does not form a seed bank and Bidens gardneri and Psychotria barbiflora may form a temporary seed bank in cerrado.