Germinação de sementes de phaseolus vulgaris l. em diferentes potenciais osmóticos induzidos por polietileno Glicol-6000.

Abstract

Seeds of ten bean cultivars (Phaseolus vulgaris L.) were submitted to six levels of osmotic tension (0; -0,2; -0,4; -0,6; -0,8 e -1 MPa) of PEG-6000, with the purpose of studying the induced effects of water stress on the germination of the seeds. The experiment was conducted in laboratory conditions, in a germinator with controled temperature and relative humidity, making use of a neutral pH paper towel as a substract. The experimental design was completely randomized in a 10 x 6 factorial scheme with four replications each consisting of 50 seeds for germination. The results obtained have shown that there was influence of PEG-6000 on the seeds germination. The cultivars Jalo Precoce and Onix were found to be more tolerant on water stress, in terms of germination. On the other hand, the cultivars Diamante Negro, Goytacazes and São José were the most sensitive ones.