鞭角华扁叶蜂对自然生境柏木挥发物释放的影响

植物挥发物（Volatile organic compounds;VOCs）在植物抵御害虫侵袭的过程中具有重要作用。本研究以重庆市云阳县长江林场人工林中健康和受害柏木为研究对象，通过VOCs测定分析发现鞭角华扁叶蜂虫害发生之前，两种柏木共计有37种VOCs成分，主要为萜类化合物，其次为醇、酯、醛、烷烃等类化合物；其中健康柏木特有驱赶作用的2-莰醇（龙脑），受害柏木特有吸引作用的顺式-2-癸烯醛，其余35种为共有成分；各成分浓度在两种柏木中存在较大差异。虫害发生之后，两种柏木共计有32种VOCs成分，而2-莰醇、顺式-2-癸烯醛、薄荷醇、臭樟脑和α-石竹烯等5种成分消失；许多成分的浓度变化趋势与虫害发生前的相反。结果表明健康与受害柏木VOCs释放的差异可能是柏木能否抵御鞭角华扁叶蜂侵害的主要防御机制之一，这将为优良抗虫柏木选育提供理论依据和参考指标。

Influences of Chinolyda flagellicornis on Volatile Organic Compounds of Cupressus funebris in Natural Conditions

Plant volatile organic compounds (VOCs) play a crucial role in the defence of insect pests. In this study, the VOCs components of Cupressus funebris under healthy and insect (Chinolyda flagellicornis)-damaged conditions were measured and analyzed at Forest Farm of Changjiang River, Chongqing. VOCs analysis before the occurrence of insect pest showed that 37 components were identified in both samples, the main component is terpenoids and the followings are phytols, esters, aldehydes, alkanes, etc.; Among them, borneol is specific to the healthy C.funebris, while (Z)-2-decena is to the damaged ones, the rests are presented in both but different in the concentrations. After the occurrence of insect pest, 32 components were identified in both samples, however, the other 5 components, borneol, (Z)-2-decenal, menthol, naphthalene and alpha-caryophyllene, had not been detected. Moreover, most of the detected ones had the contrary trends in the changes of concentrations to the results before the occurrence of insect pest. The results suggested that the difference of VOCs emission in the healthy and the damaged C.funebris is one of the important mechanisms of C.funebris defending insect pest, which would be a desirable trait and index for the selection and breeding of C.funebris against C.flagellicornis.