Clonal variation and covariation in aphid resistance to parasitoids and a pathogen
Clonal variation and covariation in aphid resistance to parasitoids and a pathogen
复制标题
DOI：
10.1111/j.0014-3820.2001.tb00829.x
复制
发表时间：
2001-09-01
期刊：
影响因子：
3.3
通讯作者：
Godfray, HCJ
中科院分区：
文献类型：
--
作者：
Ferrari, J;Müller, CB;Godfray, HCJ
对天敌抗性的潜在进化速度取决于种群中存在的遗传变异，以及抗性和其他适应性成分之间的权衡。我们测定了豌豆蚜(Acyrthosiphon Pisum)对两种寄生蜂(Aphdius ervi和A.eadyi)和一种真菌病原菌(Erynia New Apidis)的克隆变异和协变。我们发现对三种天敌的抗性存在显著的无性系变异。我们测试了这一假设，即针对不同天敌的防御能力可能存在权衡(负协变)，但没有发现任何证据。两种寄生蜂在防御能力上的相关均为正相关，且相关性显著。防御能力与繁殖力不相关。一些无性系对一种寄生蜂(A.eadyi)具有完全抗性，但这些无性系中的一部分随后无法繁殖。我们讨论了可能维持天敌抗性克隆变异的因素。
The potential rate of evolution of resistance to natural enemies depends on the genetic variation present in the population and any trade-offs between resistance and other components of fitness. We measured clonal variation and covariation in pea aphids (Acyrthosiphon pisum) for resistance to two parasitoid species (Aphidius ervi and A. eadyi) and a fungal pathogen (Erynia neoaphidis). We found significant clonal variation in resistance to all three natural enemies. We tested the hypothesis that there might be trade-offs (negative covariation) in defensive ability against different natural enemies, but found no evidence for this. All correlations in defensive ability were positive, that between the two parasitoid species significantly so. Defensive ability was not correlated with fecundity. A number of aphid clones were completely resistant to one parasitoid (A. eadyi), but a subset of these failed to reproduce subsequently. We discuss the factors that might maintain clonal variation in natural enemy resistance.