Espermidina exógena atenua os efeitos do NaCl na germinação e crescimento inicial de leguminosas forrageiras
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Data
2012-01-01
Autores
Melloni, Maria Letícia Guindalini [UNESP]
Cruz, Flávio José Rodrigues [UNESP]
Santos, Durvalina Maria Mathias dos [UNESP]
Souza, Luiz Felipe Gevenez de [UNESP]
Silva, Jéssica da [UNESP]
Saccini, Vanessa Aparecida Villanova [UNESP]
Monteiro, Juliana Geseíra [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Associação Brasileira de Tecnologia de Sementes (ABRATES)
Resumo
Objetivou-se nesse estudo avaliar o papel atenuador da espermidina exógena sobre a germinação, vigor de sementes e crescimento de plântulas de cultivares das forrageiras alfafa, guandu e labe-labe submetidas ao estresse salino. A semeadura foi realizada em caixas de plástico tipo gerbox forradas com papel de filtro umedecidos com soluções salinas nas concentrações de 0, 20, 40, 60, 80 e 120 mM de NaCl contendo 0 ou 0,5 mM de espermidina. O delineamento experimental foi inteiramente casualizado em esquema fatorial 3 x 6 x 2 (forrageiras x salinidade x espermidina) com cinco repetições de 25 sementes. As avaliações da germinação foram realizadas no quarto e décimo dias, juntamente com o índice de velocidade de germinação (IVG), avaliado até o nono dia após a semeadura. Determinou-se a concentração salina que reduz em 50% a germinação e a massa seca da parte aérea e raiz no décimo dia após a semeadura. A aplicação de espermidina exógena proporcionou maior acúmulo de massa seca das raízes de labe-labe cv. Rongai, além de ter possibilitado a germinação de 50% das sementes de guandu cv. Caqui até a concentração salina de 72,09 mM de NaCl, assim como maior IVG nas sementes das leguminosas alfafa cv. Crioula e labe-labe cv. Rongai.
The objective of this study was to evaluate the mitigating role of exogenous spermidine on the seed germination, seed vigor and seedling growth of alfalfa forage cultivars, pigeon pea and lablab subjected to salt stress. The seeds were sown in plastic gerboxes lined with filter paper moistened with saline solutions at concentrations of 0, 20, 40, 60, 80 and 120 mM NaCl containing 0 or 0.5 mM spermidine. The experimental design was a completely randomized factorial 3 x 6 x 2 (forage x salinity x spermidine) with five replicates of 25 seeds. Germination was evaluated on the fourth and tenth days, along with the germination speed index, measured until the ninth day after sowing. The salt concentration had reduced germination and the dry weight of shoot and root by 50% on the tenth day after sowing. The application of exogenous spermidine resulted in a greater dry root weight of lablab cv. Rongai, 50% germination of pigeon pea seeds cv. Caqui at the salt concentration of 72.09 mM NaCl, and a higher GSI for alfalfa cv. Crioula and lablab cv. Rongai seeds.
The objective of this study was to evaluate the mitigating role of exogenous spermidine on the seed germination, seed vigor and seedling growth of alfalfa forage cultivars, pigeon pea and lablab subjected to salt stress. The seeds were sown in plastic gerboxes lined with filter paper moistened with saline solutions at concentrations of 0, 20, 40, 60, 80 and 120 mM NaCl containing 0 or 0.5 mM spermidine. The experimental design was a completely randomized factorial 3 x 6 x 2 (forage x salinity x spermidine) with five replicates of 25 seeds. Germination was evaluated on the fourth and tenth days, along with the germination speed index, measured until the ninth day after sowing. The salt concentration had reduced germination and the dry weight of shoot and root by 50% on the tenth day after sowing. The application of exogenous spermidine resulted in a greater dry root weight of lablab cv. Rongai, 50% germination of pigeon pea seeds cv. Caqui at the salt concentration of 72.09 mM NaCl, and a higher GSI for alfalfa cv. Crioula and lablab cv. Rongai seeds.
Descrição
Palavras-chave
estresse salino, Medicago sativa L., Cajanus cajan (L.) Millsp, Dolichos lablab (L.), índice de velocidade de germinação, salt stress, Medicago sativa L., Cajanus cajan (L.) Millsp, Dolichos lablab (L.), germination speed index
Como citar
Revista Brasileira de Sementes. Associação Brasileira de Tecnologia de Sementes, v. 34, n. 3, p. 495-503, 2012.