Population dynamics of Japanese male planthoppers canceling the male-killing phenomenon by symbiotic bacteria in the small brown planthopper, Laodelphax striatellus.

螺旋体感染的小褐飞虱，在台湾种群中造成雌性感染后的后代雄杀和雌偏性。在日本东部和南部不同种群中，对雌性偏倚系的雌性与雄性进行了交叉实验。九州种群中与雄性杂交的所有配对只产生雌性成年后代。然而，在日本西部和东部人口中，一些与雄性杂交的配对产生了正常性别比例的雄性后代。这一结果表明，在日本西部和东部人群中，螺原体的雄性杀死现象被一些雄性所抵消。

Spiroplasma infected in the small brown planthopper causes male-killing and female-biased sex ratio of progenies produced by infected females in Taiwan populations. We performed cross experiments between females of female biased lines and males in various populations from eastern and southern parts of Japan. All of the pairs crossed with males in Kyushu populations produced only female adult progenies. However, some pairs crossed with males in western and eastern Japanese populations produced male progenies at the normal sex ratio. This result suggests that male-killing phenomenon in Spiroplasma is canceled by some of males in the western and eastern Japanese populations.