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| The Effect of Polyamine on Growth of Maize Seedlings Under Cadmium Stress and Its Associated Mechanisms |
| Received:January 20, 2015 |
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| KeyWord:cadmium;polyamine;maize;antioxidant enzymes;photosynthesis |
| Author Name | Affiliation | E-mail | | LI Jia | College of Agronomy, Northwest A&F University, Yangling 712100, China | | | LIU Yang | College of Agronomy, Northwest A&F University, Yangling 712100, China | liuyang0328@126.com | | QIANG Wei-min | College of Agronomy, Northwest A&F University, Yangling 712100, China | | | WANG Zhao-ren | College of Agronomy, Northwest A&F University, Yangling 712100, China | | | WEN Xiao-xia | College of Agronomy, Northwest A&F University, Yangling 712100, China | | | LIAO Yun-cheng | College of Agronomy, Northwest A&F University, Yangling 712100, China | yunchengliao@163.com |
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| Abstract: |
| In the present study, four maize cultivars with different abilities to tolerate cadmium(Cd) were used to investigate the changes of endogenous spermine(Spm), spermidine(Spd) and putrescine(Put) content under Cd stresses. The effect of polyamine on plant growth, antioxidant enzyme activity and net photosynthetic rate of Zhangyu 8, a maize cultivar sensitive to Cd, was also examined by applying external Spd, Spm and Put. Cadmium stress damaged the anti-oxidative system, induced the over-production of reactive oxygen species, inhibited the chlorophyll synthesis and photosynthesis, and finally reduced the maize growth. The content of endogenous Spd and Spm was significantly enhanced by Cd presence, which was much higher in Cd-insensitive than in Cd-sensitive cultivars. Additions of Spd and Spm significantly promoted the maize growth under Cd stresses, suggesting that Spd and Spm could counteract the negative effects of Cd on the maize seedling growth, which might be related to the activated anti-oxidative system, the reduced reactive oxygen species, and the promoted chlorophyll content and photosynthesis. Putrescine might play a limited role in alleviating Cd toxicity to maize. |
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