Asymmetrical reinforcement and Wolbachia infection in Drosophila.
Asymmetrical reinforcement and Wolbachia infection in Drosophila.
复制标题
DOI：
10.1371/journal.pbio.0040325
复制
发表时间：
2006-10
期刊：
影响因子：
9.8
通讯作者：
Minhas MS
中科院分区：
文献类型：
--
作者：
Jaenike J;Dyer KA;Cornish C;Minhas MS
强化是指在地理重叠区对异种个体的交配歧视增加的进化，可以被认为是物种形成过程的最后阶段。可能影响强化的因素之一是杂交交配导致物种基因库中基因永久丢失的程度。亚昆那果蝇（Drosophila subquinaria）雌虫与果蝇（D. recens导致高水平的后代死亡率，这是由于Wolbachia感染D. recens.这种杂种的不成活性在D. recens females和D. subquinaria雄性。在这里，我们问是否不对称的混合活力与相应的不对称的水平的强化。D. recens和D. subquinaria被发现在加拿大中部的北方森林的广阔地带重叠。雌性D.来自同域带的subquinaria对D. recens比女性从异地种群。相反，D. recens，与单向细胞质不相容性的预期效果一致。此外，在D中存在大量的行为隔离。subquinaria，因为雌性来自与D. recens歧视异地同种男性，而女性来自异地种群与D。最近的研究表明，对任何同种雄性都没有歧视。群体间的一般遗传分化模式与行为歧视模式并不一致，这表明杜父鱼群体内的行为隔离可能是由于群体间的行为隔离造成的。subquinaria的结果选择反对与沃尔巴克氏体感染D. recens.种间细胞质的不相容性可能不仅有助于交配后隔离，一种已经被广泛认可的效果，但也加强，特别是在未感染的物种。由此产生的生殖特征位移不仅增加了行为隔离从沃尔巴克氏体感染的物种，但也可能导致未感染的物种种群之间的行为隔离。鉴于沃尔巴克氏体在昆虫中的广泛存在，因此似乎有多种方式，这些内共生体可能直接和间接地有助于生殖隔离和物种形成。由Wolbachia感染引起的种间细胞质不亲和性不仅有助于交配后隔离，而且还可以加强，特别是在未感染的物种中，因此有助于促进生殖隔离。
Reinforcement refers to the evolution of increased mating discrimination against heterospecific individuals in zones of geographic overlap and can be considered a final stage in the speciation process. One the factors that may affect reinforcement is the degree to which hybrid matings result in the permanent loss of genes from a species' gene pool. Matings between females of Drosophila subquinaria and males of D. recens result in high levels of offspring mortality, due to interspecific cytoplasmic incompatibility caused by Wolbachia infection of D. recens. Such hybrid inviability is not manifested in matings between D. recens females and D. subquinaria males. Here we ask whether the asymmetrical hybrid inviability is associated with a corresponding asymmetry in the level of reinforcement. The geographic ranges of D. recens and D. subquinaria were found to overlap across a broad belt of boreal forest in central Canada. Females of D. subquinaria from the zone of sympatry exhibit much stronger levels of discrimination against males of D. recens than do females from allopatric populations. In contrast, such reproductive character displacement is not evident in D. recens, consistent with the expected effects of unidirectional cytoplasmic incompatibility. Furthermore, there is substantial behavioral isolation within D. subquinaria, because females from populations sympatric with D. recens discriminate against allopatric conspecific males, whereas females from populations allopatric with D. recens show no discrimination against any conspecific males. Patterns of general genetic differentiation among populations are not consistent with patterns of behavioral discrimination, which suggests that the behavioral isolation within D. subquinaria results from selection against mating with Wolbachia-infected D. recens. Interspecific cytoplasmic incompatibility may contribute not only to post-mating isolation, an effect already widely recognized, but also to reinforcement, particularly in the uninfected species. The resulting reproductive character displacement not only increases behavioral isolation from the Wolbachia-infected species, but may also lead to behavioral isolation between populations of the uninfected species. Given the widespread occurrence of Wolbachia among insects, it thus appears that there are multiple ways by which these endosymbionts may directly and indirectly contribute to reproductive isolation and speciation. Interspecific cytoplasmic incompatibility caused byWolbachia infection can contribute not only to post-mating isolation, but also to reinforcement, particularly in uninfected species, and therefore helps to promote reproductive isolation.
登录
查看更多内容
影响因子：
64.8
作者：
Bordenstein, SR;O'Hara, FP;Werren, JH
通讯作者：
Werren, JH
影响因子：
64.8
作者：
NOOR, MA
通讯作者：
NOOR, MA
影响因子：
3.8
作者：
BATEMAN, AJ
通讯作者：
BATEMAN, AJ
影响因子：
3.3
作者：
Coyne, JA;Orr, HA
通讯作者：
Orr, HA
DOI：
10.1073/pnas.78.6.3721
发表时间：
1981-01-01
期刊：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子：
--
作者：
LANDE, R
通讯作者：
LANDE, R