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  

Effects of Exogenous Melatonin on Seed Germination and Seedling Growth of Cyperus esculentus L.Under Salt and Drought Stress

作　　者：王宁宁 罗雪梅 陈明媛 郭睿 刘建国[1] WANG Ningning;LUO Xuemei;CHEN Mingyuan;GUO Rui;LIU Jianguo(Key Laboratory of Oasis Ecology Agriculture of Xinjiang Bingtuan,Shihezi University,Xingjiang Shihezi 832003,China)

机构地区：[1]石河子大学,新疆兵团绿洲生态农业重点实验室,新疆石河子832003

出　　处：《中国农业科技导报(中英文)》2025年第2期51-61,共11页Journal of Agricultural Science and Technology

基　　金：国家重点研发计划项目(2016YFC0501406)。

摘　　要：为探讨外源褪黑素对盐旱胁迫下油莎豆种子萌发和幼苗生长的缓解效应,采用0、50、100、150、200、250μmol·L^(-1)的褪黑素对油莎豆种子进行浸种引发处理,以200 mmol·L^(-1)NaCl溶液模拟盐胁迫、20%PEG-6000溶液模拟干旱胁迫,测定和分析不同处理下油莎豆种子的萌发、胚根和胚芽长度、生物量积累等指标。结果表明,200 mmol·L^(-1)NaCl胁迫、20%PEG-6000胁迫对油莎豆种子萌发和幼苗生长有显著抑制作用;50~150μmol·L^(-1)的褪黑素浸种对盐、旱胁迫下油莎豆种子的萌发和幼苗生长有促进作用,200~250μmol·L^(-1)的褪黑素浸种则抑制种子萌发和幼苗生长;盐旱复合胁迫加重了对油莎豆种子萌发和幼苗生长的危害程度,而外源褪黑素对油莎豆种子萌发指标、幼苗胚根和胚芽长度、植株干鲜重均有积极作用。综上所述,外源褪黑素对盐旱胁迫下油莎豆的种子萌发和幼苗生长有促进作用,其中150μmol·L^(-1)的褪黑素浸种对盐旱复合胁迫下种子萌发的缓解效果最佳,可有效减轻盐旱胁迫对种子萌发的负面效应。In order to explore the alleviation effect of exogenous melatonin on seed germination and seedling growth of Cyperus esculentus under salt and drought stress,0,50,100,150,200,250μmol·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.50~150μmol·L^(-1)melatonin promoted seed germination and seedling growth of C.esculentus under salt and drought stress,while 200~250μmol·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 150μmol·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.

关 键 词：褪黑素 盐旱复合胁迫 油莎豆 种子萌发 幼苗生长 

分 类 号：S565.9[农业科学—作物学]