Solar ultraviolet-B radiation alters the attractiveness of Arabidopsis plants to diamondback moths (Plutella xylostella L.):: impacts on oviposition and involvement of the jasmonic acid pathway
Solar ultraviolet-B radiation alters the attractiveness of Arabidopsis plants to diamondback moths (Plutella xylostella L.):: impacts on oviposition and involvement of the jasmonic acid pathway
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DOI：
10.1007/s00442-006-0422-3
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发表时间：
2006-08-01
期刊：
影响因子：
2.7
通讯作者：
Ballare, Carlos L.
中科院分区：
文献类型：
--
作者：
Caputo, Carla;Rutitzky, Mariana;Ballare, Carlos L.
太阳紫外线-B辐射（UV-B）对植物和食草昆虫之间的相互作用有很大的影响。一些研究记录了紫外线B引起的植物组织质量变化对昆虫幼虫取食性能的影响。相反，UV-B诱导的植物反应对成虫行为的影响却很少受到关注。以模式植物拟南芥为材料，进行了一系列的田间和温室试验。和专门研究十字花科植物的小菜蛾Plutella xylostella L.（小菜蛾），研究UV-B对天然植食性和植物-昆虫相互作用的影响。自然草食动物在野外条件下是不太严重的植物暴露于环境中的UV-B比过滤器，衰减太阳辐射的UV-B成分下生长的植物。这种减少的植食性不能解释为UV-B对幼虫取食偏好和性能的影响，因为小菜蛾毛虫对UV-B引起的植物质量变化没有反应。相反，在成虫阶段，昆虫提出了明确的行为反应：小菜蛾沉积显着更多的卵在植物上生长在减弱的UV-B水平比暴露于环境UV-B。茉莉酸敏感性受损的突变体jar 1 -1不存在UV-B对昆虫产卵的抑制作用，但在乙烯信号转导改变的突变体中具有保守性。与我们测试的其他基因型相比，jar 1 -1突变体也呈现出降低的紫外线吸收酚类化合物水平。我们的研究结果表明，在自然条件下的UV-B暴露的变化可以有显着的影响，昆虫植食性改变植物性状，雌成虫产卵的过程中使用的信息来源的主机选择。天然UV-B对植物质量的这些影响似乎是通过激活信号通路介导的，其中防御相关激素JA起着功能性作用。
Solar ultraviolet-B radiation (UV-B) can have large impacts on the interactions between plants and herbivorous insects. Several studies have documented effects of UV-B-induced changes in plant tissue quality on the feeding performance of insect larvae. In contrast, the effects of UV-B-induced plant responses on the behavior of adult insects have received little attention. We carried out a series of field and glasshouse experiments using the model plant Arabidopsis thaliana L. and the crucifer-specialist insect Plutella xylostella L. (diamondback moth) to investigate the effects of UV-B on natural herbivory and plant-insect interactions. Natural herbivory under field conditions was less severe on plants exposed to ambient UV-B than on plants grown under filters that attenuated the UV-B component of solar radiation. This reduced herbivory could not be accounted for by effects of UV-B on larval feeding preference and performance, as P. xylostella caterpillars did not respond to changes in plant quality induced by UV-B. In contrast, at the adult stage, the insects presented clear behavioral responses: P. xylostella moths deposited significantly more eggs on plants grown under attenuated UV-B levels than on plants exposed to ambient UV-B. The deterring effect of UV-B exposure on insect oviposition was absent in jar1-1, a mutant with impaired jasmonic acid (JA) sensitivity, but it was conserved in mutants with altered ethylene signaling. The jar1-1 mutant also presented reduced levels of UV-absorbing phenolic compounds than the other genotypes that we tested. Our results suggest that variations in UV-B exposure under natural conditions can have significant effects on insect herbivory by altering plant traits that female adults use as sources of information during the process of host selection for oviposition. These effects of natural UV-B on plant quality appear to be mediated by activation of signaling circuits in which the defense-related hormone JA plays a functional role.