山东农业大学学报（自然科学版）Issue(3)：334-339,6.DOI:10.3969/j.issn.1000-2324.2014.03.003
不同耐热性萝卜幼苗对高温胁迫的生理响应
Study on Physiological Response to High Temperature Stress in Different Heat Tolerance Radish Seedlings
摘要
Abstract
The effects of high temperature stress on the physiological indexes such as the electrol-yte leakage (EL), the content of MDA, osmotic adjustment materials and antioxidant enzyme activities in leaves of radish seedlings were investigated, taking two radish varieties of different heat tolerance as test materials. The results showed that after high temperature stress, EL and the content of MDA were up-regulated in both two radish cultivars, and the values in heat-tolerant cultivar Xiamidao (XD) were improved in a lower range than those of heat-sensitive cultivar Wuzibieke dong luo bo (WD). The contents of soluble sugar and proline were also increased and the change in XD was remarkably higher than WD under high temperature, while the contents of soluble sugar and proline in XD were higher than WD. The SOD activity in XD was improved in a high range to eliminate the hurt from O2-·, while in WD, the activities of POD and APX were all improved in a high range to clear away H2O2 of itself and prevent active oxygen hurt. This showed that the elimination mechanisms of active oxygen hurt in different heat tolerance radish cultivars are different. After recovery treat for 4 d, EL and the content of MDA in XD mainly had come to primary levels, while in WD, they were significantly higher than those before the treat of high temperature stress. The contents of soluble sugar and proline exhibited no significant difference in both two radish cultivars. However, the activities of antioxidant enzyme had bigger difference. These results indicated that the heat-tolerant cultivar XD has strong ability to maintain the relative stability of membrane system and the membrane integrity, in addition, XD has a lower degree of membrane lipid peroxide. It is clear that the breed of XD, which is heat-resistant, contains higher osmotic adjustment materials, such as soluble sugar and proline. These results indicate that XD could mitigate the injuries caused by high temperature stress by reducing electrolyte leakage and MDA content and promoting the activity of SOD.关键词
高温胁迫/萝卜/耐热性/生理响应Key words
High temperature stress/radish/tolerance/physiological response分类
农业科技引用本文复制引用
初敏,庄志群,王秀峰,王淑芬,杨凤娟,魏珉,史庆华..不同耐热性萝卜幼苗对高温胁迫的生理响应[J].山东农业大学学报（自然科学版）,2014,(3):334-339,6.基金项目
山东省财政支持重大应用技术创新课题[鲁财农指(2009)45号] （2009）
