低钾胁迫对孔雀草防御性酶活性的影响

Effect of low potassium stress on defensive enzyme activity of Tagetes patula

采用水培方法,设置5个不同供钾水平0.32、0.22、0.12、0.02、0.00 g/L,研究孔雀草(Tagetes patula L.)防御性酶对低钾胁迫的响应。结果表明,随着钾浓度的逐渐降低,孔雀草过氧化物酶(POD)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性逐渐增高,丙二醛(MDA)含量急剧增加,根质膜透性随钾浓度降低而升高。这说明低钾胁迫下孔雀草的防御性酶活性逐渐增加。

Hydroponic methods were used to set five different potassium supply levels of 0.32,0.22,0.12,0.02,and0.00 g/L to study the response of defensive enzymes of peacockgrass(Tagetes patula L.) to low potassium stress. The results showed that with the gradual decrease of potassium concentration, the activities of POD, SOD, and CAT of peacockgrass increased gradually;MDA content increased sharply;root plasma membrane permeability increased with decreasing potassium concentration. It was concluded that the defense enzyme activity of peacockgrass gradually increased under low potassium stress.