中华稻蝗不同地理种群杂交子代的滞育率

为弄清中华稻蝗Oxya chinensis Thunberg卵滞育的遗传特征,调查中华稻蝗济宁、泗洪及株洲3个地理种群卵滞育的地理变异及亲本对杂交子代滞育的影响。结果表明:南方的株洲种群仅部分卵进入滞育,滞育率较低,而纬度较高的济宁、泗洪种群的卵滞育率达100%。说明不同地理种群的中华稻蝗卵滞育率存在着地理变异。将完全滞育的济宁、泗洪种群与滞育率较低的株洲种群的雌雄成虫进行正反杂交,济宁与株洲种群、泗洪与株洲种群的子代均有部分卵为非滞育卵,与株洲种群的滞育特征相似。但不管是以株洲种群为父本,还是为母本,杂交子代的滞育率均显著高于株洲种群,而与完全滞育的济宁、泗洪种群更为接近,说明中华稻蝗卵滞育的发生受雌雄基因的共同作用,但滞育程度与滞育率高的亲本的关联性更大。

The diapause rate of hybrid offsprings among three geographic populations in a grasshopper, Oxya chinensis

To understand the genetic characteristics of egg diapause in a grasshopper, Oxya chinensis Thunberg,we investigated geographical variation of egg diapause and diapause percentage of hybrid offsprings among three geographic populations of the grasshopper species, which collected from Jining、Sihong and Zhuzhou. The results indicated that eggpods of the Zhuzhou population contained diapause and non-diapause eggs, the diapause rate was only 20%～30%, but egg diapause rate were 100% in the Jining and Sihong populations。These suggested that egg diapause shows obvious geographic variation in different populations. In reciprocal crossings between Jining and Zhuzhou populations or Sihong and Zhuzhou populations, some eggs of offsprings were non-diapause which had the same characteristics with Zhuzhou populations. But no matter Zhuzhou populations acted as maternity or paternity, the diapause rates of offsprings were higher than Zhuzhou populations which were approximately with the Jining and Sihong populations. These results suggested that the diapause occurance controlled by female and male gene, while the diapause extent is more close to the parent which has a higher diapause rate.