Resistance Of Different Wheat Varieties To Sitobionavenae

This study reports on different degree of winter wheat varieties susceptibility orresistance to Sitobion avenae F. The appraisal indicators of resistance of selected wheatvarieties to S. avenae were studied, including the correlation analysis of some importantsecondary substances, metabolic enzymes activity and wheat resistance to S. avenae; and theimpact of different winter wheat varieties on detoxifying enzyme activity in the body of S.avenae F. The results obtained were as follows:1. The tests of non-choice and antibiosis showed that the intrinsic growth rate of of S.avenae on AK58was the greatest, and the development time for S. avenae on AK58was theshortest. The winged S. avenae preferred settling on AK58tothe other varieties.2. The content of secondary substances and metabolic enzyme activity in different wheatseedlings clearly indicated that the resistance of wheat varieties was positively correlated withamount of nutritional components: the correlations between the total phenols and the totalproteins were not significant; the higher activity of PIs was negatively correlated with thehigher level of wheat antibiosis. Chemical analysis showed a higher concentration ofpolyphenol oxidase (PPO) and peroxidase (POD) in leaves of susceptible cultivars. Theactivity of PPO and POD was negatively correlated with the wheat resistance to aphids, andthe activity of PPO was significantly negatively correlated with the wheat resistance.3. Through the determination three detoxifying enzyme activity of S. avenae feeding ondifferent wheat varieties, the results showed that the carboxylesterase activity of S. avenaefeeding on different wheat varieties was different, and carboxylesterase activity level waspositively correlated with the wheat resistance. Total phenol content and the activity ofcarboxylesterase (CarE) showed a little negative correlation, but the correlation wa notsignificant. Glutathione-S-transferase (GST) activity was positively correlated with the resistance of wheat varieties to aphids, and the total phenol content was negatively correlated.The activity of cytochrome P450was not correlated with wheat resistance.