无性系

Production of some clonally seeds were low, these lines were easy to be lost while planting.

分无系种子产量低，育苗、造林时这些家系容易丢失。

In this study, 21 elite poplar varieties of Tacamahaca and Aigeiros were fingerprinted using AFLP markers.

本试验采用AFLP对来自青杨组和黑杨组的21个重要杨树品种（无系）的鉴定与传相进行了研究。

The content of flavanone and lactone in leaf and the leaf output were studied by randomizing block arrangement of 31 gingko female varieties (strain) and 4 staminiferous plant type single clone.

摘要采用31个银杏雌品种和4个雄株类型的单株无系，随机区组排列，对产量状及其与产量的相，黄酮、内酯含量进行了研究。