白花泡桐无性系自然接干性状的遗传变异研究

利用田间试验和统计分析的方法，研究了白花泡桐无性系自然接干性状的遗传变异规律。结果表明:（1）有8个自然接干性状（接干高、主干材积、接干材积、全干材积、接干材积/全干材积、主干平均削度、通直度、丛枝病等级）属于高度变异型（CV≥30）；有8个自然接干性状（主干高、全干高、主干1／2径、主干端径、接干1／2径、主干材积／全干材积、接干形数、冠幅）属于中度变异型（15≤CV＜30）；有6个自然接干性状（树高、胸径、主干基径、主干形数、主干形率、接干形率）属于低度变异型（CV＜15）。（2）接干高性状在影响和决定白花泡桐无性系自然接干性状的总体表现上起着重要作用，而通直度性状在白花泡桐自然接干性状的遗传改良中起着关键作用。。。

Genetic Variation of Natural Stem-join Characters of Paulownia fortunei Clones

The genetic variation of natural stem join characters of Paulownia fortunei clones was studied by means of field test and statistical analysis. The results were as follows: (1) Eight natural stem join characters, which were height of stem join, volume of main stem, volume of stem join, volume of whole stem, stem join volume / whole stem volume, average taper of main stem, straightness of stem and witches’broom grade, fell into the high grade variation type (coefficient of variation ≥ 30). Eight natural stem join characters, which were height of main stem, height of whole stem, diameter at half main stem height, diameter at top end of main stem, diameter at half stem join height, main stem volume / whole stem volume, stem join form factor and crown breadth, fell into the middle grade variation type (15≤coefficient of variation＜30). Six natural stem join characters, which were height of tree, diameter breast high, diameter at foot, main stem form factor, main stem form quotient and stem join form quotient, fell into the low grade variation type (coefficient of variation＜15). (2) Height of stem join played an important role in affecting and determining total display of natural stem join characters of P.fortunei clones. Straightness of stem played a key role in genetic improvement of natural stem join characters of P.fortunei. ...