红莲型不育系“青四矮2号A”(简称“青A”),株型好,丰产性能好,抗性较强,异交结实率高,F_1有较强的适应性。用“青A”与“红梅早”配制成的“青优早”是目前红莲型杂种中推广面积最大的一个组合。为充分发挥“青A”的作用,笔者近几年开展了红莲型恢复系的选育研究。徐静斐(1980)、李成荃(1981)的研究指出,与产量有关的数量性状的遗传距离大小与杂种优势强弱是一致的。可见,用遗传距离 HONGLIAN CMS “Qing Si Za 2 A” (referred to as “Green A”), plant type is good, high yield performance, strong resistance, outcrossing rate, F_1 ​​has strong adaptability. “Green A” and “Hongmei early” formulated “green early” is the current Honglian hybrids in the promotion of a combination of the largest area. In order to give full play to the role of “Green A”, the author carried out in recent years the breeding of Honglian-type restorer. Studies by Xu Jingfei (1980) and Li Chengquan (1981) point out that the genetic distances to quantitative traits associated with yield are consistent with the strength of heterosis. Can be seen with genetic distance