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近年来,在泡桐优树无性系鉴定工作中,常用采根育苗繁殖鉴定。但是,大树根深,不易挖取,而且组织老化,再生能力差,发芽率极低,给泡桐优树无性系鉴定工作带来不少困难。如1979年春季,从一株10年生兰考桐优树上挖根27条,经沙藏催芽育苗,只有4根发芽,当年平均苗高仅0.9米。1981年春季又从3年生优树上挖根20条,发芽出土仅5根,占25％。待苗高40厘米时,由于苗弱而逐渐全部死亡。为了解决上述问题,我们采用了嫁接的方法取得了比较理想的效果。1982年春季,从
In recent years, Paulownia tree clones in the identification of the work, commonly used root seedling breeding identification. However, the deep roots, difficult to dig, and tissue aging, poor regeneration, germination rate is very low, to Pampot tree superior clones identified many difficulties. For example, in the spring of 1979, 27 roots were excised from a 10-year-old orchard tree, and only 4 sprouts were germinated in the sand bank. The average seedling height was only 0.9 meters. In the spring of 1981, 20 roots were sprouted from the 3-year-old tree, with only 5 germinations, accounting for 25%. When the seedling height 40 cm, due to weak and gradually all died. In order to solve the above problems, we have adopted the method of grafting and achieved satisfactory results. Spring 1982, from