Custódio, Ceci Castilho; Vivan, Márcia Regina; Nunes, Rita de Cássia Alves; de Agostini, Edna Antônia Torquato
March 2009
Revista Brasileira de Sementes;2009, Vol. 31 Issue 1, p131
Academic Journal
Stress could be defined as an external factor that may have some disadvantageous influence on the plant. In tropical regions, crops suffer abiotic stress especially due to water deficit and high temperature. Cross tolerance allows the plants to be acclimated after a short exposure to a specific stress. The objective of this study was water stress tolerance during bean seed germination influenced by heat shock induced cross tolerance. Seed of the common bean cv 'IAPAR 81' were submitted to imbibition in substrate paper with pure water at 20°C for 24h. One third of the seeds were maintained at that temperature. One third were submitted to cold shock for 24h at 7°C in the first assay and 13°C in the second and the final part were submitted to heat shock for 24h at 38°C and 33°C as used for the cold shocks; in all experiments there was no change of substrate. Seeds submitted or not to shock were transferred to paper substrate simulating water potential of 0; -0.6; -0.9 and -1.2MPa, in the first experiment and 0;-0.3; -0.6; -0.9 and -1.2MPa in the second experiment using mannitol at: 0; 22.29; 44.58; 66.87 and 89.17 g.L-1. Treatments were evaluated by germination percentage, abnormal plants, dead seeds and seedling evaluation (shoot, root and total dry matter and by relation of root/shoot). The best development, in water restriction in early germination, was of that seeds that passed through 7°C or 33°C for 24h, that allowed the affirmation that induced cross tolerance occurred and that it could be induced at the beginning of the imbibition in bean seeds.


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