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以6个对玉米粗缩病(MRDV)表现不同抗性的玉米品种为材料,研究了粗缩病对玉米叶片叶绿素含量、超氧化物歧化酶(SOD)活性和可溶性蛋白含量的影响。结果表明,感病后,各品种叶片叶绿素含量、SOD活性和可溶性蛋白含量显著降低,叶绿素含量和SOD活性下降幅度表现为感病品种>中抗品种>抗病品种,可溶性蛋白含量下降幅度表现为抗病品种>中抗品种>感病品种(‘青农105’除外)。对病情指数与各生理指标变化幅度的相关分析发现,叶绿素含量和SOD活性的下降幅度与病情指数均呈显著正相关,除‘青农105’外的5个品种可溶性蛋白含量的下降幅度与病情指数呈极显著负相关。这说明,品种对粗缩病的抗病性与感病后各生理指标的变化幅度有关;品种抗性越强,感病后叶绿素含量和SOD活性下降幅度越小,可溶性蛋白含量下降幅度越大。
Six maize cultivars with different resistance to maize rough cut (MRDV) were used as materials to study the effects of culling on chlorophyll content, superoxide dismutase (SOD) activity and soluble protein content in maize leaves. The results showed that chlorophyll content, SOD activity and soluble protein content in leaves of all cultivars were significantly decreased, and the decreasing range of chlorophyll content and SOD activity was susceptible varieties> moderately resistant varieties> resistant varieties, and the decrease of soluble protein content was Disease resistant varieties> resistant varieties> susceptible varieties (except ’Qingnong 105’). Correlation analysis showed that there was a significant positive correlation between the decline of chlorophyll content and SOD activity and the disease index. The decrease of soluble protein content of five varieties except ’Qingnong 105’ The index was significantly negatively correlated. This shows that the variety of disease resistance of the disease and the susceptible variety of susceptible to various physiological indicators of the magnitude of the change; the stronger the variety resistance, the susceptible chlorophyll content and SOD activity decline smaller, the greater decline in soluble protein content .