外源褪黑素对盐旱复合胁迫下油莎豆种子萌发和幼苗生长的影响OA北大核心

In order to explore the alleviation effect of exogenous melatonin on seed germination and seedling growth of Cyperus esculentus under salt and drought stress,0,50,100,150,200,250 μmol·L-1 melatonin were used to soak C.esculentus seeds,200 mmol·L-1 NaCl solution was used to simulate salt stress,and 20%PEG-6000 solution was used to simulate drought stress.The germination index,lengths of radicle and germ,biomass accumulation and other indicators of C.esculentus seeds were measured and analyzed.The results showed that 200 mmol·L-1 NaCl stress and 20%PEG-6000 stress significantly inhibited the seed germination and seedling growth of C.esculentus.50～150 μmol·L-1 melatonin promoted seed germination and seedling growth of C.esculentus under salt and drought stress,while 200～250 μmol·L-1 melatonin inhibited seed germination and seedling growth.The salt-drought combined stress increased the degree of harm to seed germination and seedling growth of C.esculentus,while exogenous melatonin had positive effect on seed germination index,radicle and germ lengths of seedling,plant dry and fresh weight.In summary,exogenous melatonin promoted the seed germination and seedling growth of C.esculentus under salt-drought stress,and the concentration of 150 μmol·L-1 had the best effect on seed germination under salt-drought combined stress,which could effectively reduce the negative effects of salt and drought on seed germination.