Sensory specificity and speciation: a potential neuronal pathway for host fruit odour discrimination in Rhagoletis pomonella.
Sensory specificity and speciation: a potential neuronal pathway for host fruit odour discrimination in Rhagoletis pomonella.
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DOI：
10.1098/rspb.2016.2101
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发表时间：
2016-12-28
期刊：
影响因子：
--
通讯作者：
Olsson SB
中科院分区：
文献类型：
--
作者：
Tait C;Batra S;Ramaswamy SS;Feder JL;Olsson SB
栖息地或配偶选择的行为变化会引发种群分化，从而导致物种形成。然而，人们对这种变化的神经学基础知之甚少。毛囊绦虫（双翅目：绦虫科）是通过寄主植物转移形成生态物种的典范。在过去的180年里，危害山楂（Crataegus spp.）的Rhagoletis蝇转向了对驯化苹果（Malus pumila）的攻击。这两个种群对苹果和山楂的嗅觉偏好不同。在这里，我们通过表征对寄主果实和非寄主挥发物作出反应的Rhagoletis触角上嗅觉感觉神经元（OSNs）的形态、特异性和分布，寻找可能促成这种转变的感觉组织模式。在鉴定的28个OSN类别中，发现两个共定位的OSN对每个蝇群的主要行为引诱剂和拮抗挥发物有特异性反应。因此，通过这些成对神经元之间受体表达的转换或大脑中神经元投影的变化，这些OSNs对水果挥发物的反应发生逆转，可以解释苹果和山楂果蝇之间的行为差异。这一发现支持了一种假设，即嗅觉感觉通路的相对较小的变化可能有助于Rhagoletis宿主的快速转移和分化。
Behavioural changes in habitat or mate choice can trigger population divergence, leading to speciation. However, little is known about the neurological bases for such changes. Rhagoletis pomonella (Diptera: Tephritidae) is a model for ecological speciation via host plant shifts. Within the past 180 years, Rhagoletis flies infesting hawthorn (Crataegus spp.) shifted to attack domesticated apple (Malus pumila). The two populations differ in their olfactory preferences for apple versus hawthorn fruit. Here, we looked for patterns of sensory organization that may have contributed to this shift by characterizing the morphology, specificity and distribution of olfactory sensory neurons (OSNs) on the antennae of Rhagoletis responding to host fruit and non-host volatiles. Of 28 OSN classes identified, two colocalized OSN pairs were found that specifically responded to the major behavioural attractant and antagonist volatiles for each fly population. A reversal in the response of these OSNs to fruit volatiles, either through a switch in receptor expression between these paired neurons or changes in neuronal projections in the brain, could therefore account for the behavioural difference between apple and hawthorn flies. The finding supports the hypothesis that relatively minor changes in olfactory sensory pathways may contribute to rapid host shifting and divergence in Rhagoletis.
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影响因子：
2.8
作者：
Karpati, Zsolt;Dekker, Teun;Hansson, Bill S.
通讯作者：
Hansson, Bill S.
果蝇的时间反应动力学，嗅觉感觉神经元取决于受体类型和反应极性。
影响因子：
5.3
作者：
Getahun MN;Wicher D;Hansson BS;Olsson SB
通讯作者：
Olsson SB
DOI：
10.1111/j.1749-6632.1998.tb10616.x
发表时间：
1998-01-01
期刊：
OLFACTION AND TASTE XII
影响因子：
--
作者：
Baker, TC;Cossé, AA;Todd, JL
通讯作者：
Todd, JL
影响因子：
9.2
作者：
Dekker, T;Ibba, I;Hansson, BS
通讯作者：
Hansson, BS
影响因子：
3.3
作者：
Forbes, AA;Fisher, J;Feder, JL
通讯作者：
Feder, JL