The sweet potato whitefly, Bemisia tabaci, is one of the most invasive insect pests worldwide. The two most destructive whitefly cryptic species are MEAM1/B and MED/Q. Given that MED/Q has replaced MEAM1/B in China and the invasion of MED/Q has coincided with the outbreak of tomato yellow leaf curl virus (TYLCV), we hypothesize that pre-infestation with viruliferous B. tabaci will affect the subsequent host preferences. To test this hypothesis, we (1) conducted bioassays to compare the host preference of viruliferous and non-viruliferous MEAM1/B and MED/Q, respectively, on plants pre-infested with viruliferous and non-viruliferous MEAM1/B and MED/Q; (2) profiled plant volatiles using GC-MS; and (3) functionally characterized chemical cues could potentially modulate B. tabaci-TYLCV-tomato interactions, including ρ-cymene, thujene and neophytadiene, using a Y-tube olfactometer. As a result, plants pre-infested with MEAM1/B whiteflies carrying TYLCV or not, did not attract more or less B or Q whiteflies. Plants pre-infested with non-viruliferous MED/Q resisted MEAM1/B but did not affect MED/Q. However, plants pre-infested with viruliferous MED/Q attracted more whiteflies. Feeding of viruliferous MED/Q reduced the production of ρ-cymene, and induced thujene and neophytadiene. Functionally analyses of these plant volatiles show that ρ-cymene deters while neophytadiene recruits whiteflies. These combined results suggest that pre-infestation with viruliferous MED/Q promotes the subsequent whitefly infestation and induces plant volatile neophytadiene which recruits whiteflies.
|Journal||Frontiers in Microbiology|
|State||Published - Jun 27 2018|
Bibliographical noteFunding Information:
This work was supported by the National Key R&D Program of China (2017YFD0200400); the National Natural Science Foundation of China (31420103919, 31501643, and 31572014); the Funds for Science and Technology Innovation Project from the Chinese Academy of Agricultural Sciences (CAASXTCX2016015); the Beijing Key Laboratory for Pest Control and Sustainable Cultivation of Vegetables; and Hunan talent project (2016RS2019).
© 2018 Shi, Chen, Pan, Xie, Wu, Wang, Liu, Zhou and Zhang.
- Bemisia tabaci
- Plant volatile
- Tomato yellow leaf curl virus
ASJC Scopus subject areas
- Microbiology (medical)