我们过去都是靠种籽来培育新一代的种苗，但世界银行建议采取无性系种苗扦插技术，这样产生的种苗遗传增益高多了。
We used to rely on seeds to grow the next generation of trees but the World Bank proposed the use of cloning seedlings. This led to a much higher yield.
体细胞无性系变异已获得一些作物专利，并以此作为一种手段来产生可供选择的遗传变异，且假定该作物一旦移植生长，它的基因稳定。
Somaclonal variation has been patented in some crops as a means of producing genetic variability for selection, and it was assumed that the crops were genetically stable once established.
杉木无性系性状的遗传控制。
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