不同时期谷子对干旱胁迫的响应  

Responses to Drought Stress in Foxtail Millet(Setaria italica)at Differential Stages

作　　者：刘佳[1] 仪慧兰[1] 郭二虎[2] 张艾英[2] 

机构地区：[1]山西大学生命科学学院,山西太原030006 [2]山西省农业科学院谷子研究所,山西长治046000

出　　处：《山西大学学报（自然科学版）》2015年第1期160-164,共5页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(No.30870454;30470318;31371868);国家现代农业产业技术体系建设专项资金项目(No.CARS-07-12.5-A10);高等学校博士学科点专项科研基金(No.20121401110007)

摘　　要：为探讨谷子的耐旱规律,以晋谷20号为材料研究了干旱胁迫对抽穗期和灌浆期植株体内脯氨酸与可溶性糖含量、主要抗氧化酶活性的影响。结果表明:抽穗期干旱胁迫组谷子旗叶中脯氨酸与可溶性糖含量分别增加73.84%和29.53%,APX活性升高61.54%,H2O2和MDA含量与对照组接近;灌浆期干旱胁迫组旗叶中H2O2、MDA和脯氨酸含量显著增加,APX、CAT和POD活性升高,但可溶性糖含量显著降低。谷子抽穗期植株具有较强的抗逆能力和自我调节能力,对干旱的适应性较强,而灌浆期对干旱胁迫较为敏感;脯氨酸和APX在谷子干旱胁迫生理中发挥了重要的保护作用。In order to obtain a better understanding of the drought tolerance of foxtail millet（Setaria italica）varieties,local variety named as＂Jingu 20＂was selected as the experimental material for the field trials.Some biochemistry characteristics were assayed under both irrigation and drought stress conditions at the booting and filling stages.The results showed that the contents of proline（Pro）and soluble sugar in foxtail millet flag leaves increased respectively 73.84% and 29.53% at the booting stage under drought stress,and while the activities of ascorbate peroxidase（APX）significantly increased（61.54%）.Both hydrogen peroxide（H2O2）and malondialdehyde（MDA）contents did not change much.However,at the filling stage,the contents of H2O2,MDA and Pro increased significantly as comparied with the non-drought plants,and also the enzymatic activities of APX,catalase and peroxidase increased markedly,but the content of soluble sugar decreased.The foxtail millet variety Jingu 20 has strong resilience,self-regulation and adaptability to drought stress condition at booting stage.Conversely,foxtail millet plants are more sensitive to drought stress at filling stage.Pro and APX play important protective roles in foxtail millet plants in response to drought stress.

关 键 词：谷子 干旱 抗氧化酶活性 脯氨酸含量 

分 类 号：S515[农业科学—作物学] X17[环境科学与工程—环境科学]