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用0～200 m m ol/L的碱性盐Na2CO3 对星星草进行胁迫处理,跟踪调查星星草体内脯氨酸含量,柠檬酸含量等主要胁变指标随胁迫时间的变化。结果表明,Na2CO3 胁迫处理后星星草植株体内的有机酸、柠檬酸、脯氨酸、Na+ 等物质含量均随胁迫时间延长而迅速上升,含水量、K+ 含量、K+ /Na+ 则随胁迫时间延长而迅速下降。各项胁变反应多持续发展到胁迫后48 h 左右达最大程度,而后变化趋于平缓。各项胁变值随胁迫时间而变化的幅度因胁强增大而增大,但引发不同胁变反应所需要的胁强阈值不同,脯氨酸在50 m m ol/L时即有明显积累而柠檬酸则需要125 m m ol/L时才开始明显积累。
The star grass was treated with 0 ~ 200 m mol / L alkaline salt Na2CO3, and the changes of the main indexes such as proline content and citric acid content were observed with the change of stress time. The results showed that the contents of organic acids, citric acid, proline and Na + in A. annua increased rapidly with prolonging of Na2CO3 stress. The content of water, K + and K + / Na + increased with the prolonging of stress time Fall rapidly. The continual development of various threat reactions reached the maximum at about 48 h after stress, and then the change tended to be gentle. However, the thresholds of stress intensity required to initiate different stress responses were different. The proline accumulation significantly increased at 50 mm ol / L Citric acid requires 125 mm ol / L before it begins to significantly accumulate.