是否依靠一个无性系的杂合性就足够了？
Will it be sufficient to rely on the heterozygosity of one clone?
对美国黑核桃1 4个良种无性系的结果习性进行了初步调查。
A primary investigation is conducted on fruiting habit of 14 improved variety clones of Juglans nigra L.
在这些家系中不同无性系被大量地繁殖，也没有进行无性系的测定。
Various clones families could be propagated commercially without having been clonally tested.
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