GENETICS OF PHYSIOLOGICAL AND BEHAVIORAL RESISTANCE TO HOST FURANOCOUMARINS IN THE PARSNIP WEBWORM
GENETICS OF PHYSIOLOGICAL AND BEHAVIORAL RESISTANCE TO HOST FURANOCOUMARINS IN THE PARSNIP WEBWORM
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DOI：
10.1111/j.1558-5646.1992.tb01130.x
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发表时间：
1992-10-01
期刊：
影响因子：
3.3
通讯作者：
ZANGERL, AR
中科院分区：
文献类型：
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作者：
BERENBAUM, MR;ZANGERL, AR
Depressaria patinacella 是一种防风草网虫，几乎只以野生防风草 Pastinaca sativa 的花和果实为食。野生防风草种群对网虫的抵抗力很大程度上归因于呋喃香豆素化学成分的遗传变异；通过不同程度地减少化学表型的坐果率，防风草网虫可以作为野生防风草种群的选择剂。为了确定野生防风草化学物质是否可以作为网虫种群的选择剂，有必要确定网虫对呋喃香豆素的抗性机制是基于遗传的。在这项研究中，我们估计了网虫对防风草呋喃香豆素的行为和生理反应的遗传变异量。事实上，在不同的网络蠕虫家族中，对于呋喃香豆素含量相差四倍的饮食的摄食偏好几乎没有发现差异。在检测期间，平均呋喃香豆素摄入量也没有发现显着变化，但在一种情况下，母亲的影响可能是家庭之间差异的原因。相比之下，细胞色素 P450 介导的香柠檬烯和黄蜂毒素（两种宿主呋喃香豆素）的代谢存在显着的家族变异。新陈代谢中存在加性遗传变异，而区别性摄食行为中不存在这种变异，表明对呋喃香豆素化学变化的适应可能是通过生理手段而不是行为手段来促进的，这种变化要么是由于防风草种群中化学表型分布的变化，要么是由于向新的化学上不同的寄主植物的转变而引起。
Depressaria pastinacella, the parsnip webworm, feeds almost exclusively on the flowers and fruits of Pastinaca sativa, the wild parsnip. Resistance to webworms in wild parsnip populations is largely attributable to genetically based variation in furanocoumarin chemistry; by differentially reducing fruit set among chemical phenotypes, parsnip webworms may act as selective agents on wild parsnip populations. To determine whether wild parsnip chemistry can act as a selective agent on webworm populations, it is necessary to establish that resistance mechanisms in the webworm to furanocoumarins are genetically based. In this study, we estimated the amount of genetic variation in behavioral and physiological responses of webworms to parsnip furanocoumarins. Virtually no variation was found among webworm families for feeding preferences for diets varying as much as fourfold in furanocoumarin content. Nor was significant variation found for mean furanocoumarin intake over the assay period, except in one case, in which maternal effects may account for differences among families. In contrast, substantial familial variation existed for cytochrome P450-mediated metabolism of bergapten and xanthotoxin, two host furanocoumarins. The presence of additive genetic variation in metabolism, and the absence of such variation in discriminative feeding behavior, suggests that adaptation to changes in furanocoumarin chemistry, resulting either from changes in the distribution of chemical phenotypes in parsnip populations or from shifts to new chemically different host plants, is likely to be facilitated by physiological rather than behavioral means.