Gene flow between sexual and asexual strains of parasitic wasps: a possible case of sympatric speciation caused by a parthenogenesis-inducing bacterium
Gene flow between sexual and asexual strains of parasitic wasps: a possible case of sympatric speciation caused by a parthenogenesis-inducing bacterium
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DOI：
10.1111/j.1420-9101.2011.02257.x
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发表时间：
2011-06-01
影响因子：
2.1
通讯作者：
Abe, Yoshihisa
中科院分区：
文献类型：
--
作者：
Adachi-Hagimori, Tetsuya;Miura, Kazuki;Abe, Yoshihisa
同域物种形成的严格定义是在交配伙伴的出生地随机交配的种群中出现两个物种。数学模型表明，同域物种形成是可能的，但自然界中记录的例子很少。在这篇文章中，我们证明了寄生黄蜂Neochrysocharis Formosa的寄生品系和寄生品系通过共生细菌立克次体的感染而特有地共生：首先，在日本各地收集的所有寄生寄生品系中都检测到立克次体感染。其次，交配采集了两种不同的寄主菌株。第三，这两个菌株之间的杂交实验没有产生受精的后代。此外，这两株病毒在核基因和线粒体基因上都是分离出来的。第四，这两株毒株在核28S rRNA基因上表现出姐妹关系。最后，用抗生素处理的受精性雌性产生了与受精性雌性相同生殖形式的无立克次体雄性后代，这表明受精性品系可能是从有性受精性品系的个体共生物种。
Sympatric speciation is strictly defined as the emergence of two species from a population in which mating has been random with respect to the place of birth of the mating partners. Mathematical models have shown that sympatric speciation is possible, but very few examples have been documented in nature. In this article, we demonstrate that arrhenotokous and thelytokous strains of a parasitic wasp, Neochrysocharis formosa, speciated sympatrically through infection by a symbiotic bacterium Rickettsia for the following reasons: First, Rickettsia infection was detected in all of the thelytokous strains collected throughout Japan. Second, the arrhenotokous and thelytokous strains have been collected sympatrically. Third, crossing experiments between the two strains did not result in fertilized offspring. In addition, the two strains were genetically isolated at the nuclear and mitochondrial genes. Fourth, the two strains showed a sister relationship in nuclear 28S rRNA gene. Finally, thelytokous females treated with antibiotics produced Rickettsia-free male offspring of the same reproductive form as arrhenotokous females indicating that the thelytokous strain could have speciated sympatrically from an individual of the arrhenotokous strain.