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Leaf volatiles of sugarcane and corn during different growth stages and electroantennogram response of the Asian corn borer Ostrinia furnacalis to them

Jiang Xingchuan;Xie Xingwei;Dong Wenxia;Xiao Chun;Chen Bin;Yan Naisheng;Li Xiang;Li Zhengyue;College of Plant Protection,Yunnan Agricultural University,Key Laboratory of Agro-Biodiversity and Pest Management,founded by Education Ministry of China,Yunnan Key Laboratory of Agro-Biodiversity and Conservation;  
The volatile chemicals were collected by rinsing the leaves of sugarcane(Saccharum officinarum)and corn(Zea mays)with dichloromethane during different growth stages,and were analyzed by gas chromatographymass spectrometry(GC-MS).The electro-physiological response of the Asian corn borer Ostrinia furnacalis to 24 selected volatile compounds was recorded by electroantennogram(EAG).The results indicated that 45 and 38 compounds were identified in the seedling stage of the sugarcane and the corn,respectively,while 44 and42 com-pounds were found in the stem elongation stage of the sugarcane and the corn silking stage,respectively.Among the identified compounds,25 compounds were found in both corn and sugarcane leaves during different stages. And 4 compounds were found only in the corn leaves,while 12 compounds were present merely in the sugarcane leaves.The volatiles from the leaves of sugarcane and corn were terpenoids,green leaves,aldehydes,ketones, acids,alcohols,esters,amides,and hydrocarbons,and their contents differed between corn and sugarcane during different stages.However,the content of hydrocarbons was the most both in sugarcane and corn.All of the 24 tested volatile compounds elicited EAG responses of mated female moths.The green leaf volatiles elicited strong response,and(Z)-3-hexenyl acetate elicited the largest EAG value.The terpenoids and aldehydes elicited moderate responses,and acids and hydrocarbons elicited weak responses.The EAG values of the mated females to the compounds of the same type(except green leaf volatiles)showed no differences,and it suggested that the Asian corn borer did not discriminate the compounds of the same type effectively by olfaction.The study provides the basis for exploring the effect of plant volatiles on the behaviors of the Asian corn borer on corn and sugarcane.
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