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Jasmonic acid changes associated with long-term control of lepidopteran rice pests after insecticide seed treatment

文献类型： 外文期刊

作者： Xia, Xue 1 ; Luo, Guang-Hua 1 ; Yu, Ju -Long 3 ; Liu, Bing-Qian 1 ; Zhang, Ru 1 ; Zhang, Guo 3 ; Shu, Zhao-Lin 3 ; Lou, Yong-Gen 4 ; Hoffmann, Ary A. 5 ; Fang, Ji-Chao 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing, Peoples R China

2.State Key Lab Cultivat Base Minist Sci & Technol, Jiangsu Key Lab Food & Safety, Nanjing 210014, Peoples R China

3.Inst Zhenjiang Agr Sci, Jurong 212400, Jiangsu Hill Re, Peoples R China

4.Zhejiang Univ, Inst Insect Sci, Hangzhou 310029, Peoples R China

5.Univ Melbourne, Inst Bio21, Sch Biosci, Parkville, Vic 3010, Australia

关键词： Cnaphalocrocis medinalis; Chilo suppressalis; Sesamia inferens; seed treatment; long-term effects; jasmonates

期刊名称：ENTOMOLOGIA GENERALIS （ 影响因子：6.9； 五年影响因子：5.2 ）

ISSN： 0171-8177

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Pesticide treatment of rice seeds has been used for decades to control pests. The efficacy of chlorantraniliprole seed treatment to control pests is now well established and can last for > 90 days, even though the residue content of chlorantraniliprole in rice plants is sharply reduced by this time. We found that 60 days after chlorantraniliprole seed treatment, the dose of chlorantraniliprole in rice plants was much lower than the LC50 of chlorantraniliprole for the arthropod pests Cnaphalocrocis medinalis, Chilo suppressalis and Sesamia inferens; however, the treatment still provided control, raising the issue of how chlorantraniliprole seed treatment exerts long-term control. Untargeted metabolomics analyses showed that jasmonic acid (JA) and its metabolic derivatives were induced after seed treatment. In rice shoots and roots, the expression levels of three key genes in the JA biosynthesis pathway, AOS2, AOC and OPR7, were up-regulated. After mechanical damage, there were significant differences in gene expression patterns between the seed treated plants and the controls. Using a bioassay with two JA-deficient lines (AOC and MYC2 knockouts) and a wildtype line (XS11), we showed that the mortality rate of C. suppressalis fed on XS11 plants from treated seeds was higher than the mortality rate on JA-deficient plants from treated seeds. Thus, JA seems to play an important role in pest mortality after chlorantraniliprole seed treatment, providing a possible basis for long-term pest control from the seed treatment. These results point to better ways of using seed treatment to reduce pesticide applications.

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