[英国《泰晤士报》1977年10月20日报导]一种重要的制材树——黄杉——能大量繁殖是人工繁殖的最新成就,它有希望彻底改善园艺学和植物育种等方面的工作。若干年前最早一些人工繁殖植物的技术能作到从一块生长在实验室中特殊条件下的植物组织得到许多小的植物。其所以可能,是因为一个叶片或茎的成熟细胞如果受到特殊的激素处 [The Times reported on October 20, 1977] An important timber-growing tree, Douglas fir, is the latest achievement in artificial reproduction, promising to revolutionize horticulture and plant breeding jobs. Some of the earliest techniques of artificially propagating plants some years ago made it possible to obtain many small plants from a plant tissue grown under special conditions in the laboratory. It is possible, therefore, that if a leaf or stem of mature cells is exposed to a particular hormone