柔毛油杉无性系嫩枝秋季扦插繁殖试验

采用嫩枝扦插繁殖的方法探讨了柔毛油杉无性系苗木快繁技术。结果表明，柔毛油杉无性系间穗条扦插生根率有显著差异，参试无性系穗条扦插生根率变幅为41.5%～87.6%。穗条带6～8片叶可显著提高穗条的生根率；GGR生根剂不同浓度处理对穗条生根率有显著影响；扦插穗条长度处理为8cm可明显提高扦插成活率。本试验筛选出了扦插生根率高的无性系3个，即湘桃7号、湘桃5号、湘桃4号。

Study on the softwood cutting technique of different Keteleerla pubescens Cheng clones in autumn

In order to improve the propagation rate of cutting of Keteleerla pubescens Cheng clones, and satisfy the market demand, the authors discussed the seedlings propagation of Keteleerla pubescens Cheng by softwood cutting with different treatments. The results showed that there was significant difference in the rooting rate among different Keteleerla pubescens Cheng clones, and the rooting rate of the clones investigated ranged from 41.5% to 87.6%, and would be enhanced significantly if the cuttings possessed 6-8 pieces of leaves. Signifi-cant difference was observed too when the cuttings were eondueted with different concentration of GGR, and the cuttings, which were 8era long, would improve the survival rate remarkably. In this experiment, the authors screened 3 clones with rather higher rooting rate, namely, Xiangtao-7, Xiangtao-5 and Xiangtao-4.