不同程度的叶锈病对杨树生理代谢的影响

Effects of Poplar Leaf Rust on the Physiological Metabolism of Populus cathayana under Different Disease Degrees

通过盆栽实验研究了不同发病程度下,接种叶锈菌对青杨叶片组织内过氧化物酶、多酚氧化酶活性、丙二醛和叶绿素含量的影响。研究表明:发病程度与杨树生理指标的变化具有密切关系。接种叶锈菌后,随着感病程度的增加,POD活性呈现梯度增长,感病末期达到活性最大值;PPO活性呈规律性增长,分别与对照组存在显著差异(P<0.01);叶绿素含量一直呈下降趋势,始末变化量明显;丙二醛含量呈先迅速上升后缓慢下降态势,在感病中期达到*峰值。各生理指标与病情指数的相关性分析表明:过氧化物酶活性、多酚氧化酶活性均与病情指数呈显著正相关(P<0.05;P<0.01);叶绿素含量与感病等级呈显著负相关(P<0.01);丙二醛含量与之无显著相关性。

Pot cultivation experiments were used to study the effects of Melampsora larici-populina on the physiological metabolism of Populus cathayana under different disease degrees, specifically on the activi-with M. larici-populina and with the increasing of disease degrees, POD activity showed a gradient growth and reached its maximum value at the end; As compared with the control groups, PPO activity increased regularly, and there were significant differences with the control （P 〈 0. 01 ） ;As to chlorophyll content, it decreased significantly in the whole process; While the MDA content decreased slowly after a rapidly increase, and it peaked in the mid susceptible period. The correlation analysis of physiological indexes and disease degrees showed that the activities of POD and PPO were positively related to the disease degree （ P 〈 0. 05 ; P 〈 0. 01 ） ; And the chlorophyll content was negatively related to it （ P 〈 0. 01 ） ; and there was no significant correlation between MDA content and disease degrees.