| 李佳,刘杨,羌维民,王棹仁,温晓霞,廖允成.镉胁迫下多胺对玉米苗期生长的影响及其机理[J].农业环境科学学报,2015,34(6):1021-1027. |
| 镉胁迫下多胺对玉米苗期生长的影响及其机理 |
| The Effect of Polyamine on Growth of Maize Seedlings Under Cadmium Stress and Its Associated Mechanisms |
| 投稿时间：2015-01-20 |
| DOI：10.11654/jaes.2015.06.001 |
| 中文关键词: 镉 多胺 玉米 抗氧化酶 光合作用 |
| 英文关键词: cadmium polyamine maize antioxidant enzymes photosynthesis |
| 基金项目:国家科技支撑项目(2013BAD20B03);中央高校基本科研业务费(QN2013003) |
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| 中文摘要: |
| 选用对Cd胁迫抗性不同的玉米品种, 通过水培试验在苗期进行Cd胁迫处理, 测定不同玉米品种内源精胺(Spm)、亚精胺(Spd)和腐胺(Put)含量变化, 同时结合外源多胺处理, 测定玉米苗期植株生长、抗氧化酶活性以及光合速率等指标, 分析Cd胁迫下多胺对玉米苗期生长的影响及其生理机制。结果表明, Cd胁迫通过破坏玉米植株体内的抗氧化酶系统, 诱导玉米植株体内活性氧过量产生、降低叶绿体含量、抑制玉米光合作用, 从而抑制玉米植株的生长发育;Cd胁迫下玉米植株中内源Spd和Spm含量的提高有利于增强玉米幼苗对Cd胁迫的抗性, 而外源Spd和Spm则显着促进了玉米幼苗的生长。这表明, Spd和Spm能够有效缓解Cd胁迫对玉米幼苗生长的抑制作用, 其机制可能与其能缓解Cd对抗氧化酶系统的破坏、抑制活性氧的产生、提高叶绿素含量和植株的光合作用等因素有关;与此不同, Put可能在缓解玉米Cd胁迫的过程中未起主要作用。 |
| 英文摘要: |
| 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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