干旱胁迫对木薯苗生理特性影响研究  

Effects of Drought Stress on the Physiological Characteristics of Cassava Seeding

作　　者：单忠英[1] 罗兴录[1,2] 樊吴静[1] 罗璇[1] 

机构地区：[1]广西大学农学院,广西南宁530005 [2]亚热带农业生物资源保护与利用国家重点实验室,广西南宁530004

出　　处：《热带作物学报》2015年第2期339-343,共5页Chinese Journal of Tropical Crops

基　　金：广西科技攻关项目(桂科攻No.1222014);广西水利厅科技项目(No.201413);南宁市科技攻关项目"木薯需水特性与节水灌溉技术研究与示范"(No.20132307)和"高产优质木薯新品种选育及配套高产高效栽培技术示范推广"(No.201109044B);国家现代农业产业体系广西薯类产业创新团队薯类功能专项(No.nycytxgxcxtd-03-11-2);国家自然科学基金重点项目(No.U1033004-09)

摘　　要：为探明木薯苗在干旱胁迫下的生理特性,以木薯品种新选048为材料,用桶栽方法人工模拟土壤干旱条件,设置供水量为土壤田间最大持水量的20%、40%、60%和80%4个水分处理水平,以不供水为对照,研究不同程度干旱胁迫对木薯苗生理特性的影响。结果表明:木薯株高、茎粗、叶片的总含水量、自由水的含量、自由水和束缚水的比值均随着供水量的增加而升高;叶片脯氨酸含量、可溶性糖含量、可溶性蛋白质含量、细胞膜透性、SOD酶活性、POD酶活性均随着供水量的增加而降低。可见,干旱胁迫越严重对木薯生长越不利,土壤含水量占田间最大持水量的80%时最有利于木薯苗的生长。In order to investigate the physiological characteristics of cassava under various drought stresses, the seedlings of ＇Xinxuan 048＇ were grown under the water supply regimes of 20%, 40%, 60% and 80% water- holding capacity respectively in a greenhouse, with no water supply as the control. The results showed that, with the increasing of water supply, plant height, stem diameter, total water content, free water content and the rates of free water and bound water in leaves increased; while the content of proline, soluble sugar （SS）, soluble proteins, the cell membrane permeability, and the activities of superoxide dismutase （SOD）, peroxidase （POD） decreased. In short, the grouth of cassava seedings were getting worse with the aggravating drought degree, and the best water condition was 80% of field soil moisture capacity in the study.

关 键 词：木薯 苗 干旱胁迫 生理特性 

分 类 号：S533[农业科学—作物学]