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2013年50 No.1
Effect of potassium on the induced resistance response of two potato varieties to Myzus persicae
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Key Words：potassium, Solanum tuberosum, jasmonic acid, Myzus persicae
Abstract：
The effect of potassium (K) on the resistance response of two potato varieties, kexin and favorita, to aphids was studied. The results show that compared with the controls, jasmonic acid (JA) levels, lipoxygenase (LOX) activities and protease inhibitors (PI) of the two different varieties were increased by aphid feeding, potassium and potassium + feeding,
respectively. Jasmonic acid levels of kexin plants fed on by aphids were 22 times higher than the control and PI and lipoxygenase activity were 277% and 373% higher, respectively. Similar results were obtained from the favorita variety; jasmonic acid levels were 17 times higher than the control and PI and lipoxygenase activity increased by 224% and 29
1%, respectively. In addition, providing potato plants of both varieties with potassium significantly reduced the number of aphids feeding on them. Potassium enhanced the induced resistance of potatoes and this resistance was stronger in kexin than in favorita plants.