Calculation of the longevity of tomato seeds / Equacionamento da longevidade de sementes de tomate

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The longevity is the period of time where the seeds are kept viable. Its extremely important for the storage analysis, the forecast of the viability loss of the seeds when comparing with differents storage conditions. The present work had as objective: to equate the initial quality of the seeds (Ki) of tomato in function of the initial tests of germination and accelerated aging; and to equate standard deviation of the frequency of distribution of the tomato seed deaths during the period of storage (σ). For the determination of the Ki, was used seeds of 7 accesses of tomato of the Bank of Germoplasma-UFV and the cultivar Santa Clara. Initially, the seeds were submitted to the tests of germination and accelerated aging. After that, the value of Ki was determined experimentally buy using the traditional methodology. The results of Ki then were equated in function of the results of the tests of germination and accelerated aging, transformed into probit, using analyses of multiple linear regression. Seeds with moisture content of 10, 12 and 14% were conditioned in impermeable aluminum packings and stored at 31, 41 and 51C for the determination of the σ. Seeds of 4 accesses of tomato of the Bank of Germoplasma de Hortaliças UFV were used for the seed storage research, in order to determine the coefficients of the longevity equation. The seeds were stored by a period that varied accordance with the combination of the degree of moisture and temperature. The values of percentage of germination obtained during the storage were transformed into probit and used into multiple linear regression for determination of the coefficients of the viability equation. The results of this work allowed to conclude that the equation to determine the value of Ki in function of the initial tests of germination (G) was: Ki = 0,4968 + 0,1542.G The adjusted coefficient of regression of this equation was of 74%, the standard deviation was of 0,097 and all the coefficients of the equation were significant in 1% level. The use of this equation in the model of probit, however, is not recommended because it supplies low and very lesser values of Ki of that the initial germination, limiting its range of application. The value of the result of the test of initial germination, transformed into probit, must be used in substitution to the Ki, while other research not to present better result to equate the of the initial quality of tomato. The obtained equation to calculate the value of σ was: σ =10 5,5319 2,6783.log m 0,0066.t The adjusted coefficient of regression of the equation was of 94%, the standard deviation was of 0,12 and all the parameters of the equation were significant in 1% level.

ASSUNTO(S)

banco de germoplasma storage bank of germplasma armazenamento fitotecnia genetic resources recursos genéticos viabilty viabilidade

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