Comparação da viabilidade de sementes de Schizolobium parahyba (vell.) blake - leguminosae caesalpinioideae, pelos testes de germinação e tetrazólio

Ferreira, Robério Anastácio; Oliveira, Luciana Magda de; Tonetti, Olívia Alvina Oliveira; Davide, Antônio Cláudio

doi:10.1590/s0101-31222007000300011

Cited by 22 publications

(28 citation statements)

References 11 publications

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“…Corte longitudinal diagonal, no sentido da largura • da semente, na região distal da carúncula, evitandose atingir o eixo embrionário, através do tegumento, endosperma e embrião (Figura 1b) (Brasil, 1992); Remoção do tegumento (Figura 1c) (Grabe, 1976) (Moore, 1985;Brasil, 1992;França Neto et al, 1998).…”

Section: Methodsunclassified

“…Entre os testes mais utilizados para avaliar a qualidade das sementes, destaca-se o teste de tetrazólio, pela sua rapidez, pois os resultados podem ser obtidos em aproximadamente 24 horas, e pela sua confiabilidade, comprovada na avaliação da qualidade de sementes de soja (França Neto et al, 1998), milho (Dias e Barros, 1999), café (Dias e Silva, 1998), feijão-vagem (Bhering et al, 1996), amendoim (Bittencourt e Vieira, 1999), tomate (Santos, 2003), braquiária (Novembre et al, 2006) entre outras.…”

Section: Introductionunclassified

“…As sementes deterioradas ou danificadas mecanicamente desenvolvem rapidamente uma coloração vermelha-escura intensa e profunda, enquanto as vigorosas apresentam coloração rósea a vermelha e brilhante (Delouche et al, 1976;Bittencourt, 1995;França Neto et al, 1998). Por outro lado, nos tecidos mortos ou muito deteriorados as enzimas desidrogenases estão inativadas e por isso não ocorre a reação com o sal de tetrazólio e, consequentemente, a coloração dos tecidos (Marcos Filho et al, 1987).…”

Section: Introductionunclassified

“…Sementes pequenas de leguminosas e de alguns outros gêneros não requerem preparo, podendo ser colocadas diretamente na solução de tetrazólio (França Neto et al, 1998). Outras espécies, no entanto, possuem sementes com tegumento espesso e duro que deve ser removido antes da coloração.…”

Section: Introductionunclassified

“…As informações gerais para a realização do teste de tetrazólio de várias espécies estão indicadas nas Regras para Análise de Sementes (Brasil, 1992) e têm sido aprimoradas nos últimos anos, como pode se observar nos trabalhos de seringueira (Wetzel et al, 1992), amendoim (Bittencourt, 1995), soja (França Neto et al, 1998), milho (Dias e Barros, 1999), algodão (Vieira e Von Pinho, 1999), tomate (Santos, 2003), abobrinha (Barros et al, 2005), melancia (Bhering et al, 2005), braquiária (Novembre et al, 2006) entre outras espécies.…”

Section: Introductionunclassified

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Método de preparo das sementes de mamoneira (Ricinus communis L.) para o teste de tetrazólio

Gaspar-Oliveira¹,

Martins

Nakagawa

2009

Rev. bras. sementes

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RESUMO -O teste de tetrazólio é um método rápido e eficaz para avaliar a viabilidade e o vigor de sementes. O presente trabalho teve por objetivo padronizar o método de preparo das sementes de mamoneira (Ricinus communis L.) para a avaliação do potencial fisiológico pelo teste de tetrazólio. Foram testados os seguintes métodos de preparo das sementes: corte longitudinal mediano através do tegumento, endosperma e embrião; corte longitudinal diagonal sem atingir o eixo embrionário; remoção do tegumento; remoção do tegumento com corte longitudinal mediano através do endosperma e embrião; e remoção do tegumento com corte longitudinal mediano, paralelo aos cotilédones, através do endosperma e embrião. Antes dos preparos, as sementes foram pré-condicionadas entre papel toalha umedecido por 18 horas a 30ºC, e após os preparos, as sementes foram imersas na solução de tetrazólio na concentração de 0,5% e mantidas em câmara escura a 35ºC para o desenvolvimento da coloração. Avaliou-se a uniformidade da coloração das sementes após cada preparo, por meio da comparação entre eles. Para a avaliação do potencial fisiológico das sementes de mamoneira pelo teste de tetrazólio o método indicado de preparo é a remoção do tegumento, com posterior corte longitudinal e mediano, no sentido do comprimento, através do endosperma e embrião.Termos para indexação: viabilidade, mamona, metodologia, tegumento. PREPARATION METHODS FOR THE CASTOR BEAN SEEDS (Ricinus communis L.)TETRAZOLIUM TEST.ABSTRACT -The tetrazolium test is a quick and accurate method for estimating seed viability and vigor. This research had the objective of standardizing the preparation methods for castor bean seeds (Ricinus communis L.) to evaluate the physiological potential by the tetrazolium test. The evaluated seed preparation methods were: longitudinal cut through the middle of the seed coat, endosperm and embryo; longitudinal and diagonal cut without reaching the embryo; seed coat removal; seed coat removal with longitudinal cut through the middle of the endosperm and embryo; and seed coat removal with longitudinal cut parallel to the cotyledons through the middle of the endosperm and embryo. Before carrying out the preparation methods, the seeds were preconditioned between moist paper towels for 18 hours at 30ºC, and after preparation, the seeds were immersed in tetrazolium solution at 0.5% concentration and then placed in a dark chamber at 35ºC for the staining development. The staining uniformity was evaluated after each preparation method by comparing the methods. It was concluded that the best seed preparation method was coat removal with a lengthwise longitudinal cut, through the middle of the endosperm and embryo.

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Section: Methodsunclassified

Section: Introductionunclassified

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Método de preparo das sementes de mamoneira (Ricinus communis L.) para o teste de tetrazólio

Gaspar-Oliveira¹,

Martins

Nakagawa

2009

Rev. bras. sementes

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Seed dormancy in tree species of the Tropical Brazilian Atlantic Forest and its relationships with seed traits and environmental conditions

et al. 2015

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So far data in the literature indicate that (1) the relative proportion of tropical species with dormant versus non-dormant seeds tends to increase with a decrease in temperature and precipitation, (2) in rain forests, more species with non-dormant seeds have been found, (3) in rain forests, physiological dormancy is normally the most common type of seed dormancy, (4) the reasons why rain forests have species with dormant seeds are not well known, and studies have been done to determine if there is a relationship between the presence of dormancy in seeds with seed characteristics and environmental conditions of rain forests, and (5) it has been suggested that seed dormancy type could be connected to seed dispersion. The purpose of this work was to test, by compiling data from the literature for 162 woody species from the Atlantic Rain Forest of Brazil, the proportion of species with non-dormant and dormant seeds, and to determine if dormancy and the classes of dormancy of these species are associated with plant successional status, light environment, seed mass, and seed dispersal. The results found were (1) approximately 60 % of species had non-dormant seeds, and 40 % of species had dormant seeds, (2) physical and physiological dormancies were present in similar proportions, and combinational dormancy was the least common class of dormancy, (3) it was found that the chance that a species has physical or physiological dormancy doubles if it is a species found in a sunny environment, (4) a relationship between seed dormancy and non-dormancy, and the successional group of the species, was not found, (5) physical dormancy was highest in the non-climax group, and physiological dormancy occurred in similar proportions in non-climax and climax groups; however, a relationship was not found between class of succession and class of dormancy, (6) the proportion of the dispersal classes shows predominance for zoochory, followed by anemochory and autochory, (7) a multiple logistic regression analysis suggests that if the seeds are spread by autochory, then the chance that the seeds have physical dormancy is about eight times greater, and (8) seed mass was not associated with the presence or absence of dormancy; however, the species with physiological dormancy had seeds with smaller masses than those with physically dormant seeds. In short, for the Atlantic Rain Forest, based in compiled data from literature, it was found that seed dormancy type was related with sunny environments, dispersion, and seed size.

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The effects of an exotic palm on a native palm during the first demographic stages: contributions to ecological management

Mengardo

Pivello

2014

Acta Bot. Bras.

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Biological invasions have negative impacts on native biota and consequently on biodiversity. In patches of Atlantic Forest in Brazil, the Australian palm tree Archontophoenix cunninghamiana has become invasive, whereas the endemic palm Euterpe edulis is threatened with extinction. The two species occupy parts of the same functional niche within the forests, which raises a question: Does the invasive species interfere with the recruitment of the native one when the two co-occur? We compared the initial demographic stages of these palms, and assumed that A. cunninghamiana would present better performance (higher rates of germination and seed viability) and would feature allelopathic properties that could influence the recruitment of the native species. We investigated indirect and direct allelopathic interference, respectively, by watering E. edulis seeds with aqueous leachate solutions of A. cunninghamiana fruits and leaves and by conducting combined germination experiments. The leachate solutions neither inhibited germination nor affected the size of E. edulis seedlings. In the direct interference experiments, depulped A. cunninghamiana seeds had higher viability and germination rates than did E. edulis seeds. In E. edulis, exposure to A. cunninghamiana seeds did not affect germination nor seedling development but slightly decreased germination speed. In conclusion, A. cunninghamiana presented no significant allelopathic impediment to E. edulis establishment. However, because A. cunninghamiana seeds are usually depulped when dispersed by birds, the potential of the species to establish itself in the community surpasses that of E. edulis. We propose management strategies to enhance E. edulis performance and to restrict the spread of A. cunninghamiana.

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Comparação da viabilidade de sementes de Schizolobium parahyba (vell.) blake - leguminosae caesalpinioideae, pelos testes de germinação e tetrazólio

Cited by 22 publications

References 11 publications

Método de preparo das sementes de mamoneira (Ricinus communis L.) para o teste de tetrazólio

Método de preparo das sementes de mamoneira (Ricinus communis L.) para o teste de tetrazólio

Seed dormancy in tree species of the Tropical Brazilian Atlantic Forest and its relationships with seed traits and environmental conditions

The effects of an exotic palm on a native palm during the first demographic stages: contributions to ecological management

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