4.6 Article

Odor, Not Performance, Dictates Bemisia tabaci's Selection between Healthy and Virus Infected Plants

期刊

FRONTIERS IN PHYSIOLOGY
卷 8, 期 -, 页码 -

出版社

FRONTIERS MEDIA SA
DOI: 10.3389/fphys.2017.00146

关键词

mother-knows-best; plant virus; volatiles; performance; host preference; non-vector insects

资金

  1. State Key Program of National Natural Science Foundation of China [31420103919]
  2. 973 Program [2013CB127602]
  3. National Natural Science Foundation of China [31572014]
  4. China Agriculture Research System [CARS-26-10]
  5. Beijing Training Project For The Leading Talents in S and T [LJRC201412]
  6. Graduate Research and Innovation Project in Hunan Province [CX2015B248]
  7. Beijing Key Laboratory for Pest Control and Sustainable Cultivation of Vegetables

向作者/读者索取更多资源

Although, insect herbivores are generally thought to select hosts that favor the fitness of their progeny, this mother-knows-best hypothesis may be challenged by the presence of a plant virus. Our previous study showed that the whitefly, Bemisia tabaci, the obligate vector for transmitting Tomato yellow leaf curl virus (TYLCV), preferred to settle and oviposit on TYLCV-infected rather than healthy host plant, Datura strarnonium. The performances of B. tabaci larvae and adults were indeed improved on virus-infected D. stramoniurn, which is consistent with mother-knows-best hypothesis. In this study, B. tabaci Q displayed the same preference to settle and oviposit on Tomato spotted wilt virus (TSVVV)-infectedhost plants, D. stramoniurn and Capsicum annuum, respectively. As a non-vector of TSWV, however, insect performance was impaired since adult body size, longevity, survival, and fecundity were reduced in TSVVV infected D. stramonium. This appears to be an odor-mediated behavior, as plant volatile profiles are modified by viral infection. Infected plants have reduced quantities of o-xylene and alpha-pinene, and increased levels of phenol and 2 -ethyl-1-hexanol in their headspace. Subsequent behavior experiments showed that o-xylene and alpha-pinene are repellant, while phenol and 2-ethyl-1-hexanol are attractive. This indicates that the preference of B. tabaci for virus-infected plants is modulated by the dynamic changes in the volatile profiles rather than the subsequent performances on virus-infected plants.

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