Seed germination characteristics of Stybsanthes guianensis cv.under different drought stress

【Objective】Seed germ ination of Stybsanthes guianensis cv. under different drought stress was studied to provide references for high-yield cultivation. 【Method】Seed germination rate,average speed of germination, length of radicle and hypocotyls,germination index and viability index were measured in different drought stress simulated by different concentrations of polyethylene glycol(PEG-6000). 【Result】Under 5% PEG-6000, 907 germination rate and potential reached the highest(37.5%), which was 10.42% higher than the control.(absolute value)Its germination index was 7.25, 0.95higher than the control. More PEG-6000 made the germination rate, germination index and viability index down evidently.More stress extended the germination and fastigium time. Seed germination time equation was CK 5% treatment =10%treatment15% treatment. The control hit the germination peak on 4 d(12.5%), which was 1, 2 and 2 d ahead of 5%, 10%and 15% PEG-6000. Length of radicle and hypocotyls and biomass were reduced constantly. Seed anti-drought and germination index were on the downside. 【Conclusion】Stybsanthes guianensis cv. could stand drought to some extent. Little drought actually promoted its germination, while moderate and high level drought inhibited.