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调控褐飞虱及其天敌稻虱缨小蜂行为的活性化合物筛选及其田间效果的初步测定
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摘要
植物在遭受植食性昆虫为害后能特异性地释放挥发性物质,这些挥发物不仅能对植食性昆虫的寄生性或捕食性天敌产生引诱作用,而且亦能对周围的植物、植食性昆虫以及微生物等产生影响。鉴定这些挥发物中的活性组分,可望开发治理害虫的新方法。为此,本文以我们前期报道的褐飞虱为害诱导的水稻挥发物为基础,筛选了能对褐飞虱及其天敌稻虱缨小蜂行为产生影响的活性组分,并对能引诱稻虱缨小蜂的活性化合物或混合物进行了初步的田间试验。主要结果如下
     室内测定了褐飞虱对人工合成挥发物组分的行为反应。结果表明,共有6种挥发物组分对褐飞虱的行为反应具有明显的影响。其中farnesene、MeSA和2-heptanone对褐飞虱表现为趋避作用,linalool、E-3-ocimene和2-heptanol对褐飞虱表现为引诱作用。在具有趋避作用的组分中,farnesene和MeSA的作用较强;在具有引诱作用的活性组分中,linalool的作用最强。
     利用Y型嗅觉仪测定稻虱缨小蜂对18种单一挥发物组分和32种混配物的行为反应。结果表明,有5种单一挥发物组分,包括3种绿叶性气味(E-3-hexenyl acetate,1-penten-3-ol, E-3-hexenal均为50ppm)、1种萜类化合物(linalool,50ppm)和水杨酸甲酯(MeSA,5ppm和50ppm),对稻虱缨小蜂具有明显的引诱作用。有趣的是,我们也发现了2种挥发物组分,(+)-limonene和2-heptanol,对该蜂具有一定的趋避作用。在32种混配物中,发现有3种对稻虱缨小蜂具有显著引诱作用。
     在田间初步测定了对稻虱缨小蜂具有引诱作用的5种单一活性组分和1种混配物对田间褐飞虱卵被寄生率和被捕食率的影响。结果表明,3种单一活性组分,Linalool, E-3-hexenal和E-3-hexenyl acetate,和混配物在田间使用后能显著提高褐飞虱卵的被寄生率,分别比对照上的被寄生率上升31.67%、17.47%、7.76%和34.93%。另2种组分,MeSA和1-penten-3-ol虽然没有显著提高褐飞虱卵的被寄生率,但与对照相比仍有上升趋势。所有单一活性组分和混配物均没有显著提高褐飞虱卵的被捕食率,但除了E-3-hexenal外,其余化合物的使用都比对照有增加的趋势。
     上述研究结果表明,虫害诱导的水稻挥发物中确实存在能对褐飞虱及其天敌稻虱缨小蜂行为反应产生影响的活性组分,对这些活性组分的进一步研究,可望开发褐飞虱治理的新方法与新途径。
In response to herbivory, plants will emit specific blends of volatiles, which may not only attract the natural enemies of the herbivores, but also influence the behavior and/or performance of herbivores, microbes and the nearby plants. It will be important for finding new methods for pest control to identify active chemicals that manipulate behavioral responses of the herbivores and their natural enemies in herbivore-induced plant volatiles (HIPVs). Based on our previous identified volatiles from rice plants infested by rice brown planthopper (BPH) Nilaparvata lugens (Stal), we screened the bioactive chemicals that modulate behavioral response of BPH and its egg parasitoid Anagrus nilaparvatae. Moreover, the efficiency of the active chemicals in enhancing effect of the parasitoid in the field was tested. The main results are as follows:
     Responses of N. lugens to synthetic HIPVs were determined under laboratory conditions. The results showed that 6 chemicals have significant influence on the behavioral response of BPH. Among the 6 chemicals, farnesene, MeSA and 2-heptanone significantly repelled BPH, while linalool, E-3-ocimene and 2-heptanol significantly attracted BPH. Farnesene and MeSA were more active in repelling BPH than 2-heptanone, and linalool, on the other hand, was the most active among the 3 chemicals that were attractive to BPH.
     Attractiveness of 18 single synthetic HIPVs and 32 blends to A. nilaparvatae were tested in a Y-tube olfactometer. Five single chemicals, including three green leafy volatiles (E-3-hexenyl acetate, 1-penten-3-ol, E-3-hexenal)(50ppm), one terpenoid (linalool,50ppm) and methyl salicylate (MeSA,5ppm and 50ppm), were found to be strongly attractive to A. nilaparvatae. On the other hand, the parasitoid was also attracted by 3 blends. Interestingly, we also found that the parasitoid was repelled by 2 single chemicals, (+)-limonene and 2-heptanol.
     Primary field experiments were conducted to evaluate the effectiveness of these bioactive compounds or blends in attracting A. nilaparvatae and predators of BPH. The results showed that parasitism rates of BPH eggs by the parasitoid in the field were significantly increased when plants were hang up a seprum containing linalool, E-3-hexenal, E-3-hexenyl acetate or the mixture; the parasitism rates, compared with those in the control field, were increased by 31.67%,17.47%,7.76% and 34.93%, respectively. Application of other 2 single compounds, MeSA and 1-penten-3-ol, also increased the parasitism rates of BPH eggs, though this difference was not significant compared to the control. Application of all of the single chemicals or the blend did not cause significant increases in predation rates of BPH eggs.
     The results indicate that some chemicals from HIPVs did have influences on behavioral responses of rice brown planthopper N. lugens and its egg parasitoid A. nilaparvatae. Further elucidation of these active chemicals will exploit new methods and strategies for pest management.
引文
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