水稻的常规育种一般指的是系统选育和杂交育种。系统选育是在现有的品种群体内,根据当地的育种目标,选择某些性状与群体有差别的优良变异单株,经过培育、比较、鉴定,从而获得新的品种。在品种群体中产 Conventional breeding of rice generally refers to systematic breeding and crossbreeding. System selection is to select new varieties with good variation in traits and groups according to the local breeding objectives within the current population. Through breeding, comparison and identification, new varieties are obtained. In breed groups