针叶小爪螨——寄主植物——芬兰钝绥螨相互关系的研究Ⅱ.挥发性物质在寄主植物——针叶小爪螨——芬兰钝绥螨之间的作用

用气相色谱 -质谱联用仪分析了板栗健康叶片、被针叶小爪螨危害过 (除去叶螨 )的叶片和被该叶螨危害并带有该叶螨的叶片挥发性物质的成分和相对含量。在受害和未受害叶片中 ,石竹烯和α 法尼烯均占较大的比例。石竹烯在受害叶中的峰值增高 ;而α 法尼烯在无叶螨的受害叶中的峰值增高 ;1 辛烯在未受害叶片中未检测到 ,但在受害的叶片中则含量均较高 ,尤其有叶螨的受害叶片较无叶螨的受害叶片 1 辛烯的峰值显著增高 ;苯甲酸乙酯在有叶螨的受害叶片中较其余 2种也显著增高 ;3,7,11 三甲基 1 6 10 十二碳三烯 3 醇以有螨的受害叶中含量最高 ,无叶螨的受害叶次之 ,未受害叶含量极微 ,几乎检测不到 ;但 4 溴 2 戊烯却呈现相反的趋势 ,在未受害叶中的含量显著高于受害叶。根据生物测试结果做出如下推断 :叶片受害后 ,挥发性物质的种类和含量发生了变化 ,改变了原来寄主植物气味的化学指纹图 ,使针叶小爪螨在识别寄主植物时遇到困难 ,甚至产生了忌避作用而从受害叶转移到未受害叶上。同时这些物质对引诱芬兰钝绥螨起着重要的引诱作用

STUDIES ON THE INTERRELATIONSHIP AMONG DLYGONYCHUS UNUNGUIS HOST PLANTS AND AMBLYSEIUS FINLANDICUSⅡ.The effects of volatile on the correlation of host platns-Oligonychus ununguis-Amblyseius finlandicus

With GC MS,the composition and relative contents of the volatiles in three kinds of leaves of Castanea mollissima BL. were analyzed:uninfested leaves, infested leaves with Oligonychus ununguis, and infected leaves without the mites. Caryophyllene and Alpha|fanesene were of large proportion in all the three kinds of leaves. Peak of the Caryophyllene was higher in the infested leaves, while that of the Alpha|fanesene was higher in the infested leaves without mites. 1|octene was not found in the uninfested leaves, but was found of high content in the infested leaves, and the peak of it in these leaves with mites was higher significantly than in those without mites. Peak of Benzoic acid ethyl ester in the infested leaves with mites was higher significantly than in the other two kinds of leaves. Content of 1,6,10|doclecatrien|3|ol, 3,7,11|trimethyl was highest in the infested leaves with mites, while there were little of it in the uninfested leaves. 4|bromo|2|bentenl showed the opposite trend:the content of it in the uninfested leaves was higher significantly than in the infested leaves. It was inferred from the biological test that:having been infested, the change of the kinds and content of the volatiles changed the chemical fingerprint of the host plants' odor so that Oligonychus ununguis had difficulty in recognizing its host plants even had epellent action and migrated from the infested leaves to the uninfested leaves. At the same time, these volatiles have important inducement action in attracting Amblyseius finlandicus.