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本文采用盆栽法 ,研究了四种不同土壤水分含量条件下小麦旗叶生理特性的变化规律。结果表明 ,土壤水分含量与小麦经济产量间呈极显著正相关 (r=0 9936 ) ,提高土壤水分含量能使灌浆中后期小麦旗叶叶绿素含量、可溶性糖含量和硝酸还原酶活性均得到提高。在土壤水分胁迫条件下 ,旗叶SOD活性显著降低 ,质膜透性明显加大 ,致使植株衰老加速。
In this paper, the potting method was used to study the changes of physiological characteristics of wheat flag leaf under four different soil moisture contents. The results showed that there was a significant positive correlation between soil water content and economic yield of wheat (r = 0 9936). Increasing soil water content increased the flag leaf chlorophyll content, soluble sugar content and nitrate reductase activity during the middle and late grain filling stages. Under the condition of soil water stress, the activity of SOD in flag leaves decreased significantly, and the permeability of plasma membrane increased significantly, which accelerated the plant senescence.