Odor-regulated oviposition behavior in an ecological specialist.
Odor-regulated oviposition behavior in an ecological specialist.
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生态专家中气味调节的产卵行为。
DOI：
10.1038/s41467-023-38722-z
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发表时间：
2023-05-26
影响因子：
16.6
通讯作者：
Benton, Richard
中科院分区：
文献类型：
--
作者：
alvarez-Ocana, Raquel;Shahandeh, Michael P. P.;Ray, Vijayaditya;Auer, Thomas O. O.;Gompel, Nicolas;Benton, Richard
一个新的生态位的殖民可能需要，或者是由动物行为的进化来促进它们的繁殖成功。本文研究了黑腹果蝇（Drosophila melanogaster）的近亲、对Morinda citrifolia noni果实表现出极端专一性的黑腹果蝇（Drosophila sechellia）的产卵进化和感觉基础。d.s hellia产生的卵比其他果蝇少，并且几乎完全在noni基质上产卵。我们发现，视觉、纹理和社会线索并不能解释这种物种特有的偏好。相比之下，我们发现嗅觉输入的损失在黑腹龙舌兰中，而不是黑腹龙舌兰中，基本上消除了产卵，这表明嗅觉限制了味觉驱动的noni偏好。Noni气味是通过多余的嗅觉通路检测到的，但我们发现了己酸和同源的嗜离子受体75b （Ir75b）在气味诱发产卵中的作用。通过受体交换，我们提供了Ir75b基因气味调节变化对黑腹瓢虫产卵行为进化的因果贡献的证据。人们对动物如何在行为上适应其生态位很感兴趣。在这里，作者证明了嗅觉在诺丽果专家果蝇的产卵偏好中所起的作用，并证明了Ir75b的重要贡献，Ir75b是诺丽气味己酸的受体。
Colonization of a novel ecological niche can require, or be driven by, evolution of an animal’s behaviors promoting their reproductive success. We investigated the evolution and sensory basis of oviposition in Drosophila sechellia, a close relative of Drosophila melanogaster that exhibits extreme specialism for Morinda citrifolia noni fruit. D. sechellia produces fewer eggs than other drosophilids and lays these almost exclusively on noni substrates. We show that visual, textural and social cues do not explain this species-specific preference. By contrast, we find that loss of olfactory input in D. sechellia, but not D. melanogaster, essentially abolishes egg-laying, suggesting that olfaction gates gustatory-driven noni preference. Noni odors are detected by redundant olfactory pathways, but we discover a role for hexanoic acid and the cognate Ionotropic receptor 75b (Ir75b) in odor-evoked oviposition. Through receptor exchange in D. melanogaster, we provide evidence for a causal contribution of odor-tuning changes in Ir75b to the evolution of D. sechellia’s oviposition behavior. There is much interest in how animals adapt behaviorally to their ecological niche. Here, the authors demonstrate a role for olfaction in the oviposition preference of the noni fruit specialist Drosophila sechellia, and evidence for an important contribution of Ir75b, a receptor for the noni odor hexanoic acid.
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