无性繁殖系即克隆，又称无性系，无性繁殖系可以采用无性繁殖方法繁殖后代的某些植物，利用它们的无性繁殖器官(如马铃薯的块茎、甘薯的块根)繁殖出的后代叫无性繁殖系。同一无性繁殖系内的植株，遗传性比较一致，后代较能保持亲本的特性，通过选择和培育，可以获得优良的新品种。
自1993年以来，试验已获得用花药培养的花粉单倍体植株和用未授粉子房培养产生的愈伤组织无性繁殖系。
The paper reports the results of the study since 1993. The haploid plant from the culture of anthers and the clone of ovary without pollination have been obtained.
在开始时每个入选无性系必须包括几个无性繁殖后代。
At the outset they must contain several ramets of every selected clone.
无性繁殖在林业中应用很普遍，而由树木发育阶段转变带来的成熟效应问题，一直是无性系造林的障碍。
Vegetative propagation is widely used in forestry, however, the maturation that due to phase changes during tree development is a huge obstacle.
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