Activation of defense mechanism in wheat by polyphenol oxidase from aphid saliva

Journal of Agricultural and Food Chemistry
Rui MaJing-Rui Sun

Abstract

The saliva of two cereal aphids, Sitobion avenae and Schizaphis graminum in third-instar nymphs, was collected after 24 h of feeding by 30 aphids, separately, on artificial diet sachets, and the salivary enzymes were determined. The result showed that polyphenol oxidase (PPO) existed in the saliva of both aphid species, and the enzymatic activities were 6.2 x 10(-3) U/g for S. avenae and 2.37 x 10(-1) U/g for S. graminum, revealing a 38-fold higher activity in the saliva of S. graminum than in the saliva of S. avenae. It was speculated that the higher PPO activity in S. graminum saliva was a contributing factor to the light yellow spot left on the feeding site of the wheat leaf by S. graminum; no such spot was left by S. avenae. After treatment of a wheat seedling with the saliva of S. avenae and S. graminum and PPO at the concentration of aphid saliva, transcript profiling data showed that aphid saliva and PPO significantly induced expression of the genes aos and fps. Because genes aos and fps encode the key enzymes in the defense signal pathways jasmonic acid and terpene signal pathways, respectively, it was deduced that PPO from aphid saliva, as the main elicitor, triggers an appropriate defense response in wheat through jas...Continue Reading

References

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Citations

Sep 21, 2012·Molecular Plant-microbe Interactions : MPMI·Matthew E Studham, Gustavo C MacIntosh
Jan 3, 2014·Insect Molecular Biology·S VandermotenF Francis
Dec 19, 2012·Micron : the International Research and Review Journal for Microscopy·Hai-ying ZhongYa-lin Zhang
Jul 16, 2013·Current Opinion in Plant Biology·Dezi A Elzinga, Georg Jander
Jan 13, 2018·Archives of Insect Biochemistry and Physiology·Yong ZhangJulian Chen
Nov 23, 2017·Scientific Reports·Yong ZhangJulian Chen
May 30, 2019·International Journal of Molecular Sciences·Dan LiuNingjia He
Sep 16, 2017·Journal of Agricultural and Food Chemistry·Yong ZhangJulian Chen

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