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Your Position :Home->Past Journals Catalog->2021年58 No.4

Sexual differences in the response of the parasitoid wasp Anagrus nilaparvatae to rice volatiles
Author of the article:HUANG Ting-Fa MA Ying TANG Bing-Jie WANG Bing-Yang ZENG Rou-Xian ZHOU Qiang ZHANG Gu-Ren
Author's Workplace:School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; School of Agriculture, Sun Yat-sen University, Guangzhou 510275, China
Key Words:Anagrus nilaparvatae; rice volatiles; electroantennography; sexual dimorphism
Abstract:
[Objectives]  To clarify sexual differences in the response of the parasitoid wasp Anagrus nilaparvatae to rice volatiles in order to improve the effectiveness of using parasitic wasps as biological control agents. [Methods]  A potentiometric, micro-antennae detection method was developed to measure the EAG responses of female and male A.nilaparvatae to 9 different kinds of rice volatiles. Gradient concentration stimulation experiments were also performed to detect significant gender differences in the response to specific chemicals. [Results]  The largest peak amplitudes in males were recorded in response to trans-2-hexenal and the smallest to trans-caryophyllene. Responses of males to aldehydes, esters, alcohols and terpenes ranged from large to small. For females, the highest response was to cis-jasmone and the lowest to linalool. Six of the 9 rice volatiles tested elicited significantly different responses in males and females. In the gradient concentration experiment, only 3 of the 6 volatiles tested (trans-caryophyllene, nerolidol and trans-2-hexenol) elicited a significant response from males, whereas all 6 compounds elicited a significant response from females. The terpenoids linalool, trans-caryophyllene and nerolidol, elicited the strongest responses at a concentration of 0.01 g/L, which was the lowest concentration used in experiments. [Conclusion]  There are significant sexual differences in the responses of A. nilaparvatae to rice volatiles; females respond to a greater range of volatiles than males. EAG responses to rice volatiles were detected within the concentration range of 0.01-100 g/L, which could be a preliminary indication that differences in EAG responses to volatiles reflect different ecological functions.
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