| 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 |
| Key Words: exogenous auxin half seawater stress maize seedling leaf senescence |
| Author Name | Affiliation | | LIU Hongzhan | College of Marine Life Sciences, Ocean University of China, Qingdao, Shandong 266003, China
Marine College of Shandong University at Weihai, Weihai, Shandong 264209, China | | ZHENG Fengrong | First Institute of Oceanography of SOA, Qingdao, Shandong 266061, China | | TANG Xuexi | College of Marine Life Sciences, Ocean University of China, Qingdao, Shandong 266003, China |
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| Abstract: |
| 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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