Two kinds of sex ratio distorters in a moth, Ostrinia scapulalis
Two kinds of sex ratio distorters in a moth, Ostrinia scapulalis
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DOI：
10.1139/g03-083
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发表时间：
2003-12-01
期刊：
影响因子：
3.1
通讯作者：
Ishikawa, Y
中科院分区：
文献类型：
--
作者：
Kageyama, D;Nishimura, G;Ishikawa, Y
我们调查了来自日本六个地理位置的蛾 Ostrinia scapulalis（鳞翅目：Crambidae）的雌性性别比例特征（SR 特征）。一小部分（8.3%）女性表现出 SR 特征。其中大约一半与沃尔巴克氏体感染（SRw（+））有关，而其余的则与沃尔巴克氏体感染无关（SRw（-））。对于 SRw(+) 或 SRw(-) 女性，不同地点和年份之间的频率没有显着差异。在SRw(+)母系中，SR性状被遗传。在幼虫阶段用四环素治愈沃尔巴克氏体感染，导致下一代全雄性幼崽。这些特征与之前在相关物种亚洲玉米螟中观察到的沃尔巴克氏体诱导的 SR 特征相同。肩胛圆线虫中的沃尔巴克氏体菌株与亚洲圆线虫中的沃尔巴克氏体菌株在 wsp 和 ftsZ 基因序列方面无法区分，这表明感染要么起源于两个宿主的共同祖先，要么沃尔巴克氏体在宿主物种之间水平传播。另一方面，在 SRw(-) 母系中，SR 性状不是由细菌感染引起的，而是由其他一些母系遗传因素引起的，因为抗生素治疗没有效果，而且细菌 PCR 也没有给出特征产物。这些母系的 SR 性状有时无法表现出来，表明存在抑制 SR 性状的核因子。
We surveyed female-biased sex ratio traits (SR traits) in a moth, Ostrinia scapulalis (Lepidoptera: Crambidae) from six geographic locations in Japan. A small proportion (8.3%) of females showed the SR trait. About half of them were associated with a Wolbachia infection (SRw(+)), whereas the remaining ones were not (SRw(-)). No significant differences in frequencies were detected among locations and years for either SRw(+) or SRw(-) females. In SRw(+) matrilines, the SR trait was inherited., Curing the Wolbachia infection by tetracycline at the larval stages resulted in all-male broods in the next generation. These characteristics were identical to the Wolbachia-induced SR trait observed previously in the related species Ostrinia furnacalis. The Wolbachia strain in O. scapulalis was indistinguishable from that in O. furnacalis in terms of the wsp and ftsZ gene sequences, suggesting either that infection originated from a common ancestor of the two hosts or that Wolbachia was transmitted horizontally between the host species. In SRw(-) matrilines, on the other hand, the SR trait was not due to bacterial infection but some other maternally inherited element, since antibiotic treatment had no effect and bacterial PCR did not give the characteristic product. It, these matrilines, the SR trait occasionally failed to show, suggesting the presence of nuclear factor(s) suppressing the SR trait.