外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响  

Effects of Exogenous Melatonin on Growth and Photosynthetic Characteristics of Cotton Seedlings under Salt Stress

作　　者：李阳 陈静 刘绍东 沈倩 张思平 葛常伟 刘瑞华 马慧娟 万素梅[1] 庞朝友[2] LI Yang;CHEN Jing;LIU Shaodong;SHEN Qian;ZHANG Siping;GE Changwei;LIU Ruihua;MA Huijuan;WAN Sumei;PANG Chaoyou(College of Plant Sciences,Tarim University,Aral Xinjiang 843300,China;State Key Laboratory of Cotton Biology/Institute of Cotton Research of Chinese Academy of Agricultural Sciences,Anyang Henan 455000,China)

机构地区：[1]塔里木大学植物科学学院,新疆阿拉尔843300 [2]棉花生物学国家重点实验室中国农业科学院棉花研究所,河南安阳455000

出　　处：《新疆农业科学》2021年第8期1418-1426,共9页Xinjiang Agricultural Sciences

基　　金：中国农业科学院科技创新(CAAS-ASTIP-2020-ICR)。

摘　　要：【目的】土壤盐渍化严重制约棉花幼苗生长,褪黑素(Melatonin,MT)能有效调控植物在盐胁迫下的生长机制。研究外源褪黑素对盐胁迫下棉花幼苗生长及光合特性的影响。【方法】采用对棉花幼苗叶面喷施外源褪黑素的方法,分析外源褪黑素在NaCl胁迫下棉花幼苗生长及光合系统的响应,筛选出最适喷施褪黑素浓度。以新陆中70号为材料,设置不同褪黑素浓度(25、50、100、200μmol/L)处理,测定NaCl胁迫下不同时间段(1、3、6和9 d)棉花幼苗生长指标及叶片荧光、光合作用参数等指标。【结果】NaCl胁迫显著降低棉花幼苗株高、叶片光合、荧光指标,喷施外源褪黑素后,促进株高生长及干物质质量的增加,并有效缓解了NaCl胁迫对棉花幼苗叶片净光合速率、气孔导度、最大光化学效率、PSⅡ有效光量子产量、光化学猝灭等指标的影响,减少NaCl胁迫对棉花幼苗的损伤。【结论】NaCl胁迫条件下,外源褪黑素能有效促进棉花幼苗生长,喷施100μmol/L褪黑素浓度处理效果最佳。【Objective】Soil salinization seriously affects the growth of cotton seedlings,and Melatonin(MT)plays an important role in regulating the salt tolerance of plants.In this study,the method of spraying exogenous melatonin on the leaf surface of cotton seedlings was used to explore the response of exogenous melatonin to cotton seedling growth and photosynthetic system under NaCl stress,and to screen out the most suitable spraying melatonin concentration.Effects of Exogenous Melatonin on Growth and Photosynthetic Characteristics of Cotton Seedlings under Salt Stress.【Methods】Xinluzhong 70 was taken as the material,and different melatonin concentrations(25,50,100,200μmol/L)treatment were set tp measure cotton seedling growth indexes,leaf fluorescence,photosynthesis parameters and other indexes in different time periods(1,3,6,9 d)under NaCl stress.【Results】NaCl stress significantly reduced plant height,leaf photosynthesis and fluorescence indexes of cotton seedlings after spraying melatonin and the plant height and dry matter quality of cotton seedlings were increased.Furthermore,the effects of NaCl stress on the net photosynthetic rate,stomatal conductance,maximum photochemical efficiency,PSII effective photon yield,photochemical quenching and other indicators of cotton seedling leaves were effectively alleviated and the damage of NaCl stress to cotton seedlings was also reduced.【Conclusion】The results showed that under NaCl stress spraying exogenous melatonin can effectively promote the growth of cotton seedlings,and spraying 100μmol/L melatonin concentration has the best result.

关 键 词：棉花幼苗 褪黑素 盐胁迫 光合特性 

分 类 号：S562[农业科学—作物学]