根据作物的繁殖方式 ,针对当前推广利用品种的遗传组成、育种特点及繁育制种方法等 ,将作物品种划分为纯系品种、杂交种、多系品种和无性系品种等四种类型。文中讨论了各类品种的育种特点 According to the propagation mode of crops, the four types of crop varieties are divided into pure lines, hybrids, multi-lines and clones, aiming at the genetic composition, breeding characteristics and breeding and breeding methods of the current popularized and utilized varieties. The article discusses the breeding characteristics of all varieties