Induction of preference and performance after acclimation to novel hosts in a phytophagous spider mite: Adaptive plasticity?
Induction of preference and performance after acclimation to novel hosts in a phytophagous spider mite: Adaptive plasticity?
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DOI：
10.1086/339463
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发表时间：
2002-05-01
影响因子：
2.9
通讯作者：
Sabelis, MW
中科院分区：
文献类型：
--
作者：
Agrawal, AA;Vala, F;Sabelis, MW
我们研究了两个实验室种群的多食性二斑叶螨，一个人口适应豆和其他人口适应番茄诱导的偏好和性能的新的宿主植物。我们只培育了四个大豆种群的同雌株系，并将它们用于所有的测定。菜豆种群在番茄上的繁殖力比菜豆上低30%，而番茄种群在两种寄主植物上的繁殖力相等。驯化的成年女性的新的宿主植物的两个人口增加了接受新的主机，但并没有增加拒绝原主机。大豆种群在适应番茄的产卵量方面经历了60%的收益和30%的成本，从而体现了适应性可塑性。番茄群体表现出23%的利益，适应豆类，但没有成本。螨从豆人口适应番茄喂养番茄比螨不适应番茄。当这些螨喂食细胞色素P-450解毒酶的抑制剂，他们的表现是严重抑郁症（84%），番茄，但不是在豆。然而，螨喂食P-450酶抑制剂并没有减少他们接受番茄作为宿主。因此，在新的主机（但不是偏好）在这个物种的性能可能与诱导解毒酶。已知蜘蛛螨会在新宿主上迅速形成宿主种族。诱导的偏好和生理驯化通过解毒酶可能会提高性能，因此，强烈有助于宿主小种形成的初始阶段。
We examined induction of preference and performance on novel host plants for two laboratory populations of the polyphagous spider mite Tetranychus urticae, with one population adapted to bean and the other population adapted to tomato. We bred four isofemale lines of the bean population only and used them in all the assays. The bean population had a 30% lower fecundity on tomato than on bean, while the tomato population had equal fecundity on both host plants. Acclimation of adult females to the novel host plant for both populations increased acceptability of that novel host but did not increase rejection of the original host. The bean population experienced a 60% benefit and a 30% cost in terms of egg production for acclimating to tomato, thus exemplifying adaptive plasticity. The tomato population showed a 23% benefit for acclimating to bean but no cost. Mites from the bean population that were acclimated to tomato fed more on tomato than did mites that were not acclimated to tomato. When these mites were fed inhibitors of cytochrome P-450 detoxification enzymes, their performance was severely depressed (84%) on tomato but not on bean. However, mites that were fed inhibitors of P-450 enzymes did not reduce their acceptance of tomato as a host. Thus, performance on novel hosts (but not preference) in this species is likely correlated with the induction of detoxifying enzymes. Spider mites are known to form host races rapidly on novel hosts. Induction of preference and physiological acclimation via detoxification enzymes may enhance performance and, thus, strongly contribute to initial stages of host race formation.