2种桉属树种插条中酚类物质及相关酶活性差异研究（摘要）

目的]为加快邓恩桉的推广提供理论基础。方法]以邓恩桉（Euca lyptus dunnii）和尾巨桉无性系U9（E.urophylla×E.Grandis.U9）为试验材料,研究了2种桉属树种插条中酚类物质及相关酶活性的差异。结果]2种桉属树种插条中酚类物质含量及吲哚乙酸氧化酶（IAAO）、过氧化物酶（POD）和多酚氧化酶（PPO）活性差异显著。与U9相比,邓恩桉插条中酚类物质含量及POD活性较高,而IAAO、PPO活性较低。结论]插条中较高含量的酚类物质及相关氧化酶活性差异可能是导致邓恩桉扦插生根困难的重要因素。

Differences in Phenolic Compounds and Related Enzyme Activities between 2 Eucalyptus Species

Objective] The aim was to provide theoretical basis for speeding up the popularization of Eucalyptus dunnii.Method] Differences in phenolic compounds and related enzyme activities between hard rooting E.dunnii and easily rooting E.urophylla×E.grandis clone （U9） were studied.Result] There were significant differences in contents of phenolic compounds and activities of indole acetic acid oxidase （IAAO）,andperoxidase （POD） and polyphenol oxidase （PPO） between the two Eucalyptus species.Compared with U9,contents of phenolic compounds and POD activity of E.dunnii cuttings were relatively high,while activities of IAAO and PPO were relatively low.Conclusion] More phenolic compounds and the differences in related enzyme activities might be the major factors to result in hard rooting of E.dunnii cuttings.