Effects of Frankliniella occidentalis feeding and mechanical damage on the antioxidant system in bean leaves

Author of the article:CONG ChunLeiZHI JunRui**LIAO QiRongMOU Feng

Author's Workplace：Institute of Entomology, Guizhou University, The Provincial Key Laboratory for Agricultural Pest Management of Mountainous Region, Guiyang550025, China

Key Words：Frankliniella occidentalis, feeding, mechanical damage, antioxidant enzyme, antioxidant substance

Abstract：The effects of Frankliniella occidentalis (Pergande) feeding and mechanical damage on the antioxidant system of bean leaves was studied by comparing the antioxidant enzyme activities and antioxidant substance content of bean leaves subject to these two treatments. Antioxidant enzymes of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) were found to increase to some extent after both feeding and mechanical damage. However, the changes in enzymes were not the same between the two treatments, and the times of peak enzyme activities differed between them. The effect of feeding on antioxidant enzyme activities was greater than that induced by mechanical damage. Differences in arotenoids were not significant between treatments. The amounts of flavones and total phenolics decreased after both treatments, with F. occidentalis feeding causing a greater decline than mechanical damage. These results indicate that feeding by thrips has a greater effect on the antioxidant system of bean plants than mechanical damage.