Behavioral antagonism in the moth Helicoverpa zea in response to pheromone blends of three sympatric heliothine moth species is explained by one type of antennal neuron
Behavioral antagonism in the moth Helicoverpa zea in response to pheromone blends of three sympatric heliothine moth species is explained by one type of antennal neuron
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DOI：
10.1111/j.1749-6632.1998.tb10616.x
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发表时间：
1998-01-01
期刊：
影响因子：
--
通讯作者：
Todd, JL
中科院分区：
文献类型：
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作者：
Baker, TC;Cossé, AA;Todd, JL
我们已经发现了一种类型的感器上的触角的雄性玉米穗蛾，Helicoverpa茶，房子两种类型的受体神经元（RN），既解释了逆风飞行的吸引力男性自己的物种的信息素混合物和吸引力相当相似的混合物发出的女性的其他三个同域的北美heliothine物种。第一种RN类型是一个大的尖峰神经元，对（Z）-9-十六碳烯醛（Z9-16：Ald）最敏感，次级H。玉米信息素成分，其沿着主要成分（Z）-11-十六烯醛，引起对雌性的吸引。该RN也响应于（Z）-9-十四烯醛（Z9-14：Ald;不是H.茶信息素组分）。因此，该RN的灵敏度解释了当将小比例的Z9-14：Ald加入Z11-16：Ald以模拟同种混合物时在其他研究中观察到的吸引力。第二种类型的RN在这个感器是一个小的尖峰神经元，再次响应Z9-14：Ald（在较大的比例作为一个强大的拮抗剂逆风飞行），但这个RN实际上是更敏感的两个其他强大的行为拮抗剂，（Z）-11-十六碳烯乙酸酯和（Z）-11-十六烯醇。因此，激活这个单一的广泛调谐的“拮抗剂”RN可以解释为什么H。茶树雄株只对它们的同种雌株定向。这三种化合物是由其他三种北美物种的雌性释放的，H。subflexa，H. phloxiphaga，和R. virescens作为激动剂在它们的混合物中也含有H.茶组分Z11-16：Ald和Z9-16：Ald。这种拮抗剂RN也可以解释为什么Z11-16：Ald和少量Z9-14：Ald的混合物对H没有吸引力。茶雄作为同种混合物。同种混合物的特异性增强，因为拮抗剂RN从未被刺激激发，即使当大比例的信息素组分Z9-16：Ald加入到Z11-16：Ald中时。然而，当使用Z9-14：Ald代替Z9-16：Ald时，并且Z9-14：Ald的比例变得太大时，超过拮抗神经元的阈值以及激动神经元的阈值，并且逆风飞行反应开始受到抑制。
We have discovered a type of sensillum on the antennae of male corn earworm moths, Helicoverpa tea, that houses two types of receptor neuron (RN) that explains both the upwind flight attraction of males to their own species' pheromone blend and arrestment to the quite similar blends emitted by females of three other sympatric North American heliothine species. The first RN type is a large-spiking neuron that is most sensitive to (Z)-9-hexadecenal (Z9-16:Ald), the secondary H. zea pheromone component that along with the major component, (Z)-11-hexadecenal, causes attraction to the female. This RN is also responsive to (Z)-9-tetradecenal (Z9-14:Ald; not a H. tea pheromone component) at higher dosages. The sensitivity of this RN thus explains the attraction that has been observed in other studies when small proportions of Z9-14:Ald are added to Z11-16:Ald to mimic the conspecific blend. The second type of RN in this sensillum is a small-spiking neuron that is again responsive to Z9-14:Ald (which in larger proportions acts as a strong antagonist to upwind flight), but this RN is actually more sensitive to two other strong behavioral antagonists, (Z)-11-hexadecenyl acetate and (Z)-11-hexadecenol. Thus, activation of this single broadly tuned 'antagonist' RN could explain why H. tea males mill orient only to their conspecific females. These three compounds are emitted by females of three other North American species, H. subflexa, H. phloxiphaga, and R. virescens, as agonists in their blends, which also contain the H. tea components Z11-16:Ald and Z9-16:Ald. This antagonist RN may also explain why a blend of Z11-16:Ald and a small amount of Z9-14:Ald is never as attractive to H. tea males as the conspecific blend. Enhanced specificity for the conspecific blend arises because the antagonist RN is never stimulated to fire, even when large proportions of the pheromone component, Z9-16:Ald, are added to Z11-16:Ald. When Z9-14:Ald is used instead of Z9-16:Ald, however, and the proportion of Z9-14:Ald becomes too great, the threshold of the antagonist neuron as well as that of the agonist neuron is exceeded, and the upwind flight response begins to be suppressed.