Plants Pre-Infested With Viruliferous MED/Q Cryptic Species Promotes Subsequent Bemisia tabaci Infestation.
Plants Pre-Infested With Viruliferous MED/Q Cryptic Species Promotes Subsequent Bemisia tabaci Infestation.
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DOI：
10.3389/fmicb.2018.01404
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发表时间：
2018
影响因子：
5.2
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Shi X;Chen G;Pan H;Xie W;Wu Q;Wang S;Liu Y;Zhou X;Zhang Y
甘薯粉虱是世界范围内最具侵袭性的害虫之一。最具破坏性的两个粉虱隐种是MEAM1/B和MED/Q。鉴于MED/Q已经取代了中国中的MEAM1/B，并且MED/Q的入侵恰逢番茄黄化卷叶病毒(TYLCV)的爆发，我们推测，预先侵染致病烟粉虱将影响后续的寄主选择。为了验证这一假设，我们(1)进行了生物测试，以比较寄主对预先感染了毒力和非毒力的MEAM1/B和MED/Q的寄主选择性；(2)使用GC-MS分析植物挥发物；以及(3)使用Y管嗅觉仪，功能表征的化学信号可能潜在地调节烟粉虱-TYLCV与番茄的相互作用，包括ρ-伞花烃、侧柏烯和新植二烯。结果表明，预先接种携带TYLCV的MEAM1/B粉虱或不接种MEAM1/B粉虱的植株并不能吸引更多或更少的B或Q粉虱。接种非致病性MED/Q的植株对MEAM1/B具有抗性，但不影响MED/Q，但预感染MED/Q的植株吸引了更多的粉虱。毒力强的MED/Q降低了ρ-聚伞花序的产生，并诱导了侧柏烯和新植二烯的产生。对这些植物挥发物的功能分析表明，ρ-聚伞花序阻止，而新植物二烯招募粉虱。这些综合结果表明，预先感染毒力强的MED/Q促进了随后的粉虱侵染，并诱导了植物挥发性新植二烯，从而招募了粉虱。
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.
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