| 刘洪展,郑风荣,唐学玺.外源生长素对半海水胁迫下玉米幼苗叶片衰老特性的影响[J].干旱地区农业研究,2010,28(2):104~108 |
| 外源生长素对半海水胁迫下玉米幼苗叶片衰老特性的影响 |
| Effects of exogenous auxin on the senescent characteristics of leaves of maize seedlings during half seawater stresses |
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| DOI：10.7606/j.issn.1000-7601.2010.02.21 |
| 中文关键词: 外源生长素 半海水胁迫 玉米幼苗 叶片衰老 |
| 英文关键词:exogenous auxin half seawater stress maize seedling leaf senescence |
| 基金项目:国家海洋局青年海洋科学基金重点资助项目(2009119) |
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| 中文摘要: |
| 为了探讨在盐渍环境下外源生长素对植物生长的调节作用，以抗性玉米品种农大108为材料，研究了50%比例海水处理过程中吲哚乙酸(indole acetic acid,IAA)对玉米幼苗叶片衰老相关指标的影响。结果表明：随着处理时间的延长，叶片中的叶绿素含量以及叶绿素a/叶绿素b降低，类胡萝卜素含量升高，而可溶性蛋白含量、丙二醛含量和超氧物歧化酶活性先上升后下降，说明半海水胁迫可以加快叶片的衰老进程；补充使用不同浓度的吲哚乙酸后，丙二醛水平下降，其余指标保持在较高的水平上，其中0.5 mg/L的吲哚乙酸处理组的衰老指标变
化最明显，说明适宜浓度的外源生长素可以延缓海水胁迫造成的植物叶片衰老。 |
| 英文摘要: |
| In order to study the regulative function of exogenous auxin on the plant growth during saline stresses, the impacts of indole ace
tic acid (IAA) on the related indexes of leaf senescence in the seedlings of stress-tolerant maize variety Nongda108 during the treatment of half seawater were studied. The results indicate: while the extent of seawater stress increases, total chlorophyll content as well as the ratio of chlorophyll a / chlorophyll b decreases, and carotenoid content rises in the leaves. However, the content of soluble protein and malondialdehyde (MDA) and superoxide dismutase (SOD) activity ascends，and then declines respectively. This means half seawater can accelerate the senescent progress of leaves. After the treatments of half seawater mixed with IAA at its different ultimate concentrations, MDA content is reduced and othe
r mentioned indexes remain higher level than that of single seawater stress. Among the IAA treatments, the senescent indexes change most evidently especially in the group of 0.5 mg/L. This shows the application of exogenous auxin with appropriate concentration can alleviate the leaf senescence caused by seawater stresses. |
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