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打破传统观念:雄性产生的科罗拉多马铃薯甲虫聚集信息素

Breaking a paradigm: male-produced aggregation pheromone for the Colorado potato beetle.

作者信息

Dickens Joseph C, Oliver James E, Hollister Benedict, Davis John C, Klun Jerome A

机构信息

United States Department of Agriculture, Agricultural Research Service, Plant Sciences Institute, Vegetable Laboratory, Beltsville, MD 20705, USA.

出版信息

J Exp Biol. 2002 Jul;205(Pt 13):1925-33. doi: 10.1242/jeb.205.13.1925.

Abstract

A male-produced aggregation pheromone was identified for the Colorado potato beetle Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae). While male beetles produced only minor amounts of the pheromone, its production could be enhanced by topical application of juvenile hormone III (JH III) (eightfold), by antennectomy (40-fold) or by the combined treatment of JH III and antennectomy (almost 200-fold); this enhancement enabled the identification of the compound as (S)-3,7-dimethyl-2-oxo-oct-6-ene-1,3-diol [(S)-CPB I], a unique structure for an insect pheromone. Antennal receptors of both sexes responded selectively to the (S)-enantiomer. Both male and female Colorado potato beetles were attracted to serial source loads of (S)-CPB I in laboratory bioassays; (R)-CPB I was inactive or inhibitory, as demonstrated by the inactivity of the racemate. This is the first identification of a pheromone for the Colorado potato beetle and differs from the paradigm of a female-produced pheromone for this insect. The attractant is also the first male-produced pheromone identified for the Chrysomelidae. The discovery that both JH III and antennectomy increase levels of the pheromone (S)-CPB I indicates the existence of a feedback system involving antennal input, and this system may be under hormonal control.

摘要

已鉴定出一种由雄性产生的聚集信息素,用于科罗拉多马铃薯甲虫(Leptinotarsa decemlineata (Say),鞘翅目:叶甲科)。虽然雄性甲虫仅产生少量的信息素,但通过局部应用保幼激素III(JH III)(提高8倍)、切除触角(提高40倍)或联合应用JH III和切除触角(提高近200倍),可增强其产生;这种增强使得该化合物被鉴定为(S)-3,7-二甲基-2-氧代-辛-6-烯-1,3-二醇[(S)-CPB I],这是一种昆虫信息素的独特结构。两性的触角感受器对(S)-对映体有选择性反应。在实验室生物测定中,雄性和雌性科罗拉多马铃薯甲虫都被(S)-CPB I的系列源负荷所吸引;外消旋体无活性,这表明(R)-CPB I无活性或具有抑制作用。这是首次鉴定出科罗拉多马铃薯甲虫的信息素,与该昆虫由雌性产生信息素的模式不同。这种引诱剂也是首次为叶甲科鉴定出的由雄性产生的信息素。保幼激素III和切除触角均能提高信息素(S)-CPB I的水平,这一发现表明存在一个涉及触角输入的反馈系统,并且该系统可能受激素控制。

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