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个银杏雌性品种和4个雄株类型单株无性系，随机区组排列，对性状及关性，黄酮、内酯含进行了研究。

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

由于部分无性系种子低，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21个重要杨树品种（无性系）鉴定遗传关性进行了研究。