Intrinsic pre-zygotic reproductive isolation of distantly related pea aphid host races.
Intrinsic pre-zygotic reproductive isolation of distantly related pea aphid host races.
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远缘豌豆蚜宿主种族的内在合子前生殖隔离。
DOI：
10.1098/rsbl.2018.0332
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发表时间：
2018
期刊：
影响因子：
3.3
通讯作者：
Fazalova V
中科院分区：
文献类型：
--
作者：
Fazalova V
人类活动可能会削弱或破坏年轻类群之间的生殖隔离，导致他们的融合与人口和社区生态的后果。豌豆蚜虫寄主种族适应不同的豆科植物类群，提供了一定程度的交配前隔离介导的栖息地选择。然而，所有的种族都可以在蚕豆（蚕豆）上喂养和繁殖，蚕豆是一种代表“通用宿主植物”的主要作物，可以促进种族之间的杂交。在这里，我们问，如果豌豆蚜虫主机种族有生殖障碍，防止或减少基因流时，他们共同出现在通用的主机植物。我们观察了交配行为，女性的生存，卵数和卵受精率为三种类型的杂交：在同一个主机种族的个人之间，密切相关的主机种族之间和远亲主机种族之间。我们没有发现在交配行为和女性之间的三种类型的杂交生存显着差异。然而，我们观察到在远缘杂交中，产卵数量和受精卵数量急剧减少。我们的结论是，广泛的蚕豆种植在农业中可能倾向于密切相关，但不是远亲宿主种族杂交，破坏生殖隔离之间的初期物种。
Human activities may weaken or destroy reproductive isolation between young taxa, leading to their fusion with consequences for population and community ecology. Pea aphid host races are adapted to different legume taxa, providing a degree of pre-mating isolation mediated by habitat choice. Yet, all races can feed and reproduce on the broad bean (Vicia faba), a major crop which represents a ‘universal host plant’, which can promote hybridization between races. Here, we ask if pea aphid host races have reproductive barriers which prevent or reduce gene flow when they co-occur on the universal host plant. We observed mating behaviour, female survival, number of eggs and egg fertilization rates for three types of crosses: among individuals of the same host race, between closely related host races and between distantly related host races. We did not find significant differences in mating behaviour and female survival among the three types of crosses. However, we observed a drastic reduction in the number of eggs laid, and in the number of fertilized eggs, in distant crosses. We conclude that widespread broad bean cultivation in agriculture may predispose closely related—but not distantly related—host races to hybridize, disrupting reproductive isolation between incipient species.