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Variation in both host defense and prior herbivory can alter plant-vector-virus interactions

文献类型： 外文期刊

作者： Shi, Xiaobin 1 ; Preisser, Evan L. 3 ; Liu, Baiming 2 ; Pan, Huipeng 2 ; Xiang, Min 4 ; Xie, Wen 2 ; Wang, Shaoli 2 ; Wu, 1 ;

作者机构： 1.Hunan Acad Agr Sci, Inst Plant Protect, Changsha 410000, Hunan, Peoples R China

2.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Beijing 100081, Peoples R China

3.Univ Rhode Isl, Dept Biol Sci, Kingston, RI 02881 USA

4.Hunan Acad Agr Sci, Hunan Hort Res Inst, Changsha 410125, Hunan, Peoples R China

5.Chinese Acad Sci, Inst Genet & Dev Biol, Beijing 100101, Peoples R China

6.Univ Kentucky, Dept Entomol, Lexington, KY 40546 USA

关键词： Virus-vector-host interaction; Plant defense; Jasmonic acid; Plant volatile; Bemisia tabaci

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2019 年 19 卷 1 期

页码：

收录情况： SCI

摘要： Background: While virus-vector-host interactions have been a major focus of both basic and applied ecological research, little is known about how different levels of plant defense interact with prior herbivory to affect these relationships. We used genetically-modified strains of tomato (Solanum lycopersicum) varying in the jasmonic acid (JA) plant defense pathways to explore how plant defense and prior herbivory affects a plant virus (tomato yellow leaf curl virus, 'TYLCV'), its vector (the whitefly Bemisia tabaci MED), and the host. Results: Virus-free MED preferred low-JA over high-JA plants and had lower fitness on high-JA plants. Viruliferous MED preferred low-JA plants but their survival was unaffected by JA levels. While virus-free MED did not lower plant JA levels, viruliferous MED decreased both JA levels and the expression of JA-related genes. Infestation by viruliferous MED reduced plant JA levels. In preference tests, neither virus-free nor viruliferous MED discriminated among JA-varying plants previously exposed to virus-free MED. However, both virus-free and viruliferous MED preferred low-JA plant genotypes when choosing between plants that had both been previously exposed to viruliferous MED. The enhanced preference for low-JA genotypes appears linked to the volatile compound neophytadiene, which was found only in whitefly-infested plants and at concentrations inversely related to plant JA levels. Conclusions: Our findings illustrate how plant defense can interact with prior herbivory to affect both a plant virus and its whitefly vector, and confirm the induction of neophytadiene by MED. The apparent attraction of MED to neophytadiene may prove useful in pest detection and management.

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