2001年,松黑木吉丁Melanophila acuminata De Geer*首次在我国北京地区发生。北京植物园的481株移栽的油松死亡173株,死亡株率为36%2006年,再次发现其在香山停车场油松林内成灾,死亡株率为33%。本文在2004-2006年对该虫生物学特性、发生规律研究的基础上提出:北京应进一步深入调查研究该虫在北京的分布及其成灾的条件与机理,高度重视该虫再次成灾的预防。
A study was conducted to explore the defense response in woody plants after insect herbivory. The activities of two enzymes, lipoxygenase （LOX）, a key enzyme ofjasmonate （JA） pathway, and phenylalanine ammonia lyase （PAL）, a rate-limiting enzyme of phenyl- propanoid pathway, were measured in the leaves of one-year-old poplar （Populus simonii × P. pyramidalis ＇Opera 8277＇） cuttings after Clostera anachoreta larvae attack. The results show that the increased activities of LOX and PAL were found not only in the leaves wounded by C. anachoreta larvae but also in their tipper systemic leaves, indicating that JA and phenylpropanoid pathways were activated, and the defense response was stimulated systemically. The increase in LOX and PAL activities in neighboring intact poplar cuttings sug- gested that there exists the interplant communication between poplar plants mediated by the herbivore-induced volatiles. Methyl jasmonate （MeJA） was also proved to be an airborne signal to induce defense response in P simonii × P pyramidalis ＇Opera 8277＇ cuttings.
