Viability equation constants for two Phaseolus vulgaris cultivars / Constantes de viabilidade para sementes de feijoeiro dos cultivares Tibatã e Una

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The previous knowledge of seed performance during storage is important to evaluate its storability. This experiment analysed Phaseolus vulgaris seed storage aiming to get viability equation constants for two cultivars, as to guarantee seed disposal and conservation. Seeds were rehydrated over water or dried over silica gel, both at 25ºC, from the initial moisture contents, until achieved desired mc values. Seed samples with mc ranging from 3.28 to 16.65 and 3.14 to 17.26 (Tibatã and Una), with initial mc of 13.61 and 12.35%, respectively, were then placed in aluminium foil packets and stored at 40, 50 e 65ºC until obtaining complete survival curves. Statistical analysis was performed through Glim software. Two different groups of constants were calculated as to predict seed longevity of Tibatã and Una cultivar, as follows: KE = 5.759; 4.556; CW = 4.598; 5.209; CH =0.0451; 0.1213; CQ = 0.001014; 0.001764, respectively. An inverse relationship was observed between moisture content and seed longevity. The lower limit for viability equation application at 65ºC for the cultivars Tibatã and Una were 4.52 and 6.15%, respectively, on equilibrium with RH around 20%.

ASSUNTO(S)

tecnologia de sementes sementes - deterioração feijão comum - semente - viabilidade controlled deterioration seed longevity feijão comum secagem feijão comum - semente - armazenamento hermetic storage phaseolus vulgaris feijão comum - semente hidratação

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