Chemoattraction in Pristionchus nematodes and implications for insect recognition
Chemoattraction in Pristionchus nematodes and implications for insect recognition
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DOI：
10.1016/j.cub.2006.10.031
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发表时间：
2006-12-05
期刊：
影响因子：
9.2
通讯作者：
Sommer, Ralf J.
中科院分区：
文献类型：
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作者：
Hong, Ray L.;Sommer, Ralf J.
线虫和昆虫是物种数量上占优势的两个动物类群，线虫-昆虫相互作用构成了生态系统多样性中种间关系的重要组成部分。据推测，大多数昆虫代表了移动的微生境，线虫可以在其中获得食物、移动性和庇护所。线虫-昆虫共生体可分为泳虫共生体（昆虫用于运输，而不是作为食物）、尸虫共生体（昆虫用于运输，然后尸体作为食物）和昆虫病原共生体（昆虫被杀死并用作食物）。为了确定线虫如何靶向其宿主，我们分析了与金龟子甲虫和科罗拉多马铃薯甲虫形成物种特异性坏死关联的密切相关的Pristionchus线虫的化学感觉反应和行为参数[1，2]。我们发现，所有四个研究的Pristionchus物种对昆虫信息素和植物挥发物与Pristionchus栖息地的链接显示出独特的化学吸引力配置文件。此外，太平洋对虾的化学吸引作用与C.不仅在引诱剂的种类上，而且在其反应的克里思、方式和浓度范围上也有明显的差异。我们的结论是，Pristionchus嗅觉密切相关的物种之间是高度多样化的，很可能参与塑造线虫-宿主的相互作用。
Nematodes and insects are the two dominant animal taxa in species numbers, and nematode-insect interactions constitute a significant portion of interspecies associations in a diversity of ecosystems. It has been speculated that most insects represent mobile microhabitats in which nematodes can obtain food, mobility, and shelter. Nematode-insect associations can be classified as phoretic (insects used for transportation, not as food), necromenic (insect used for transportation, then carcass as food), and entomopathogenic (insect is killed and used as food). To determine how nematodes target their hosts, we analyzed the chemosensory response and behavioral parameters of closely related Pristionchus nematodes that form species-specific necromenic associations with scarab beetles and the Colorado potato beetle [1, 2]. We found that all four studied Pristionchus species displayed unique chemoattractive profiles toward insect pheromones and plant volatiles with links to Pristionchus habitats. Moreover, chemoattraction in P. pacificus differs from that of C. elegans not only in the types of attractants, but also in its tempo, mode, and concentration response range. We conclude that Pristionchus olfaction is highly diverse among closely related species and is likely to be involved in shaping nematode-host interactions.