通过选择优良无性系，组建综合品种的途径有利于根蘖性状提高。
The way to set up synthetic variety by selecting good colone is of benefit to developing creeping rooted charcter.
采用31个银杏雌性品种和4个雄株类型的单株无性系，随机区组排列，对叶产量性状及其与叶产量的相关性，叶黄酮、内酯含量进行了研究。
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.
对优良林草品种的选择和林草复合经营技术试验结果表明：引进的速生杨、速生柳各无性系间的扦插繁育和植苗造林成活率均不存在显著性差异；
Experimental results indicated that for the introduced fast-growing poplar and willow the cutting cultivating and the seedling planting of all clones had no significant difference in survival rate.
采用体细胞融合、转基因技术等手段已经培育出了一些耐冷的品种，无性系变异的利用也已经在一些作物上取得成功。
Through gene transferring and somatic hybridization, cold-tolerant varieties have been obtained and the exploitation of somaclonal variation of some crops also succeeds.
研究了12个不同品种美国山核桃无性系嫁接苗的叶绿素荧光特性。
Chlorophyll fluorescence characteristics of engrafted seedlings of 12 different pecan clones were studied.
研究了12个不同品种美国山核桃无性系嫁接苗的叶绿素荧光特性。
Chlorophyll fluorescence characteristics of engrafted seedlings of 12 different pecan clones were studied.
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