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Tea green leafhopper, Empoasca vitis, chooses suitable host plants by detecting the emission level of (3Z)-hexenyl acetate

Published online by Cambridge University Press:  22 July 2016

Z.-J. Xin
Affiliation:
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture, Hangzhou 310008, China
X.-W. Li
Affiliation:
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture, Hangzhou 310008, China
L. Bian
Affiliation:
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture, Hangzhou 310008, China
X.-L. Sun*
Affiliation:
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture, Hangzhou 310008, China
*
*Author for correspondence Fax: 86-571-86650331 Tel: 86-571-86650350 E-mail: xlsun1974@163.com

Abstract

Green leaf volatiles (GLVs) have been reported to play an important role in the host-locating behavior of several folivores that feed on angiosperms. However, next to nothing is known about how the green leafhopper, Empoasca vitis, chooses suitable host plants and whether it detects differing emission levels of GLV components among genetically different tea varieties. Here we found that the constitutive transcript level of the tea hydroperoxide lyase (HPL) gene CsiHPL1, and the amounts of (Z)-3-hexenyl acetate and of total GLV components are significantly higher in tea varieties that are susceptible to E. vitis (Enbiao (EB) and Banzhuyuan (BZY)) than in varieties that are resistant to E. vitis (Changxingzisun (CX) and Juyan (JY)). Moreover, the results of a Y-tube olfactometer bioassay and an oviposition preference assay suggest that (Z)-3-hexenyl acetate and (Z)-3-hexenol offer host and oviposition cues for E. vitis female adults. Taken together, the two GLV components, (Z)-3-hexenol and especially (Z)-3-hexenyl acetate, provide a plausible mechanism by which tea green leafhoppers distinguish among resistant and susceptible varieties. Future research should be carried out to obtain the threshold of the above indices and then assess their reasonableness. The development of practical detection indices would greatly improve our ability to screen and develop tea varieties that are resistant to E. vitis.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2016 

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