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对29个楸树无性系的生长性状(树高、地径、胸径、节间距)、叶片性状(叶片长度、宽度、叶柄长度、叶面积、鲜比叶质量、干比叶质量)和叶绿素荧光参数(Fv/Fm)等11个指标进行测定。结果表明:Fv/Fm的日变化曲线呈“V”字型,体现了楸树无性系光能利用率的变化和叶片在高光强下的自我保护机制;29个楸树无性系树高、地径、胸径的平均值分别为4.58m、50.98cm、39.31cm,叶片鲜比叶质量和干比叶质量平均值分别为0.042和0.014g/cm2,Fv/Fm平均值为0.836。叶片长度、宽度和叶柄长度平均值均大于20.00cm,表明楸树无性系叶片较大。方差分析结果表明:各指标差异极显著,其中7个指标表型变异系数大于10%,遗传变异系数与表型变异系数接近;10个指标重复力超过0.800,表明楸树无性系各指标受较强的遗传因素控制。相关分析表明:无性系各生长指标存在显著相关性。主成分分析结果显示:11个性状前3个主成分累积贡献率为71.23%;第1主成分Y1贡献率最高(35.92%),主要包括树高、地径、胸径等生长量指标,第2主成分Y2主要为比叶质量和Fv/Fm等指标;第3主成分Y3则主要代表叶片长度、叶片宽度等叶片性状。利用综合评价法对无性系进行综合评价,当入选率为20%,无性系2-2、008-1、2-8、9-1、1-1和4001入选,这6个无性系的树高和胸径的遗传增益分别为11.23%和9.58%。楸树无性系间生物量各指标与叶绿素荧光参数差异显著,为进一步研究提供基础。
The growth traits (height, diameter, DBH, pitch) of 29 Catalpa bungei clones, leaf traits (leaf length, width, petiole length, leaf area, fresh leaf ratio, dry leaf ratio) and chlorophyll fluorescence Parameters (Fv / Fm) and other 11 indicators were measured. The results showed that the daily variation curve of Fv / Fm was “V”, which reflected the change of light energy utilization rate and the self-protection mechanism of leaves under high light intensity. The tree height, The mean values of diameter and DBH were 4.58m, 50.98cm and 39.31cm respectively. The average fresh leaf specific mass and dry leaf specific mass were 0.042 and 0.014g / cm2, respectively. The average Fv / Fm was 0.836. Leaf length, width and petiole length average more than 20.00cm, indicating Catalpa tree climax leaves larger. Analysis of variance showed that there was a significant difference among all the indexes, of which the coefficient of phenotypic variation of seven indexes was more than 10%, and the coefficient of genetic variation was close to that of phenotypic coefficient of variation. The repeatability of ten indexes exceeded 0.800, Strong genetic control. Correlation analysis showed that there was a significant correlation between the growth indexes of clones. The principal component analysis showed that the cumulative contribution rate of the first three principal components of the 11 traits was 71.23%, the highest contribution rate of the first principal component Y1 (35.92%), including the growth index of tree height, diameter and DBH, Main component Y2 is mainly specific leaf mass index and Fv / Fm index; the third main component Y3 mainly represents leaf length, leaf width and other leaf traits. The clonal evaluation was conducted by comprehensive evaluation method. When the selection rate was 20%, clones 2-2, 008-1, 2-8, 9-1, 1-1 and 4001 were selected. The trees of these six clones The genetic gains of height and DBH were 11.23% and 9.58% respectively. Catalpa bungei biomass between the various indicators and chlorophyll fluorescence parameters significantly different, to provide a basis for further study.