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Studies on Germination Condition and Stress Resistance of Hordeum brevisubulatum Seeds

Yu Ling Wang Yanrong Sun Jianhua (Gansu Grassland Ecological Research Institute, Lanzhou 730020)  
Effects of germination conditions of temperature and pretreatment, and stresses of salt and drought on germination of Hordeum brevisubulatum were investigated. The results showed that the optimum germination temperature were alternating temperatures at either 15/25℃ or 20/30℃, prechilling was the effective method to break seed dormancy. The seed had strong resistance to salt stress, and the resistance to the NaCl was higher than Na 2SO 4. The critical salt stress value for germination were -1.34 MPa in NaCl and -1.13 MPa in Na 2SO 4. The shoot growing length showed positive response to higher osmotic potential (≥-0.5 MPa), while showed negative response to the lower osmotic potential (≤-0.7 MPa) of salt stresses. But the root growing length was inhibited by all osmotic potential solutions (-0.1~-1.5 MPa) used. The seed of Hordeum brevisubulatum also showed a strong resistance to the drought (PEG, 6 000 mol) stress, the critical value for germination was -1.07 MPa in PEG 6 000 solution. Both shoot and root growing were suppressed by drought stress, but the root showed slightly than the shoot. Compared to germination percentage, seed vigour index was more sensitive to salt and drought stresses.
【Fund】: 甘肃省农委基金;甘肃省草原生态研究所青年科学基金
【CateGory Index】: S54
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