水稻叶片酶活性与生理性状对碱性盐胁迫的响应分析

Response Analysis of Enzyme Activity and Physiological Characters of Rice Leaves to Alkaline Salt Stress

水稻体内酶活性与生理指标因胁迫环境而改变,为明确水稻酶活性和生理性状对碱性环境的响应机制,试验设置了6个浓度的碱性盐胁迫处理,研究水稻对苏打碱胁迫的响应机制。试验结果表明,随苏打碱浓度增加,SOD活性、ASA含量、伤流量呈显著下降趋势;POD活性、MDA含量、水稻叶片相对电导率等呈显著上升趋势,CAT活性呈先降后升的趋势;POD与SOD活性存在线性负相关。试验结论:生长于碱性环境的水稻,细胞膜发生损伤,导致发生歧化反应的活性氧清除机制被削弱,催化反应的活性氧清除机制成为主要保护机制。

Enzyme activity and physiological index of rice changed with the stress environment.To clarify the response mechanism of rice enzyme activity and physiological characters to alkaline environment,this study applied six different concentrations of alkaline salt stress to investigate the rice plant's response to soda alkali stress.The results showed that SOD activity,ASA content and injury flux decreased significantly with the increase of soda concentration,POD activity,MDA content and relative conductivity of rice leaves increased significantly,CAT activity decreased first and then increased,POD and SOD activity had a linear negative correlation.These findings suggest that rice plants grown in alkaline environments,the membrane of rice cells is damaged,which leads to the weakening of the active oxygen scavenging mechanism of disproportionation,and the catalytic active oxygen scavenging mechanism is the main protective mechanism.