英语语法分析

The critical problem encountered in the breeding work of autotetraploid rice is the low and unstable fertility.

结实低而不稳是四倍体水稻育种遇到的重要障碍。

This paper studied the fertilization of the hybrid between autotetraploid sorghum and Johnson grass and the genetic characters of the hybrid generation.

本试验研究了高粱同源四倍体与约翰逊草远缘杂交的结实性及其后代表现。

The seed setting rate has no obvious difference between autotriploid and autotetraploid, but it will rise with the increase of the self-bred generations.

③同源三倍体和同源四倍体之间的自交结实率没有明显的区别，结实率会随着自交代数的增加而上升。