保护地集约栽培早竹衰老的激素机理研究  

Study on the Hormonal Mechanism of Earlier Aging of Phyllostachys praecox Stands Caused by Mulching Cultivation

作　　者：丁兴萃[1] 

机构地区：[1]南京林业大学森林环境资源学院

出　　处：《浙江林业科技》2006年第3期7-11,共5页Journal of Zhejiang Forestry Science and Technology

摘　　要：通过测定未覆盖、2～3a覆盖、4～5a覆盖和6～7a覆盖4种不同经营方式早竹竹鞭内源激素含量和比值的变化来研究早竹因覆盖提早衰老的规律，结果表明：①从未覆盖到6～7a覆盖，竹鞭ABA含量明显增加，而GA3、IAA、Zr、iPA含量则减少，其中，Zr、iPA含量减幅较小，上述激素含量均在从4～5a覆盖到6～7a覆盖有较明显的变化。GA3／ABA、IAA／ABA、Zr／ABA和iPA／ABA比值均随覆盖时间增加而下降，特别是GA3／ABA，IAA／ABA，GA3＋IAA／ABA比值较大，且从4～5a覆盖到6～7a覆盖时均有显著下降，与竹鞭衰老时间相吻合；②竹子衰老不是由于根部CTK合成降低向地上部分供应减少造成的，而是由GA3／ABA、IAA／ABA、GA3＋IAA／ABA比值决定的，比值高抑制衰老，反之比值低则促进衰老，其中以GA3／ABA比值为主，以IAA／ABA比值为辅。Determination was carried out on endogenous hormone content and ratio of rhizomes of Phyllostachys praecox stands treated with unmulching, 2 - 3, 4 - 5 and 6 - 7 year mulching for earlier aging rule. The result showed that from unmulching to 6 - 7 year mulching, ABA content increased markedly while that of GA3, IAA, Zr, iPA decreased, but the one of Zr, iPA declined slightly, the above 5 hormones changed significantly from 4 - 5 year mulching to 6 - 7 year mulching. The ratio of GA3/ABA, IAA/ABA, Zr/ABA and iPA/ABA declined from unmulching to 6 - 7 year mulching, particularly GA3/ABA, IAA/ABA, GA3 ＋ IAA/ABA, and also decreased from 4 - 5 year mulching to 6 - 7 year mulching, the same as the aging year of rhizome. The earlier aging caused by mulching was not determined by less synthesis of CTK in root and its less supply to the above part of bamboo, but by the ratio value of GA3/ABA, IAA/ABA, GA3 ＋ IAA/ABA, of which GA3/ABA played the most important function, and IAA/ABA the second.

关 键 词：早竹 衰老 激素 

分 类 号：S795[农业科学—林木遗传育种]