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Effect of Osmotic Stress on the Initial Development of Bean Seedlings

American Journal of Plant Sciences 2014年第13期5卷 1973-1982页

作者： Pablo Diego Silva Cabral Leonardo N.S.dos Santos Henrique Duarte Vieira tais cristina bastos soares Cintia Aparecida Bremenkamp Weverton Pereira Rodrigues University of North Rio de Janeiro State Darcy Ribeiro Rio de JaneiroBrazil Faculty of Agricultural Engineering University of CampinasSao PauloBrazil Agricultural Sciences Center Federal University of Espirito SantoVictoriaBrazil Instituto Capixaba de Pesquisa e Extensao Rural—INCAPER VictoriaBrazil

One of the methods to determine the tolerance of plants to water stress is the observation of germination of seeds under stress induced in laboratory conditions. Thus, the aim was to evaluate the response of four common bean cultivars to water deficit simulated under laboratory conditions. Two common landrace genotypes acquired from farmers (FORT 07 and FORT 08) and two commercial cultivars, IAPAR 81 and Serrano were evaluated. The different levels of water deficit were induced with mannitol solution. The experimental design was completely randomized and a factorial scheme 5 × 4 (osmotic potential x genotypes), with four replications. The characteristics: primary root protrusion, seed vigor, normal and abnormal seedling, seedling and root length, fresh and dry weight of seedling and root were evaluated. By reducing the osmotic potential seedling vigor bean was more affected than the primary root protrusion. Regardless of cultivar, there was a significant and progressive reduction in the normal seedlings percentage from potential -0.3 MPa. The IAPAR 81 and FORT 07 cultivars showed higher tolerance to water deficit compared to other cultivars.

关键词： Phaseolus vulgaris L. Mannitol Water Stress

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