小叶杨不同种源一年生扦插苗速生期表型性状变异定量分析

葛会硕; 宋跃朋; 苏雪辉; 张德强; 张晓宇

doi:10.3969/j.issn.1001-3776.2020.01.004

小叶杨不同种源一年生扦插苗速生期表型性状变异定量分析

Analysis on Phenotypic traits Variation of Different Provenances of 1-year Populus simonii Seedlings

摘要

摘要: 定量分析了来自我国15 个种源（25°~ 42° N，95°~ 117° E）小叶杨Populus simonii 一年生幼苗节间长度的相关性、表型性状的地区差异性以及变异性，将选取的样本划分为4 个时期并借助因子分析对其23 ~ 26 个节间长变量进行了相关性分析，借助人工蜂群K-means 聚类（KABC）算法将样本分为2 大类；并对不同地区样本表型变异定量分析。结果表明，因子分析将节间长度变量提取为4 个公共节间长度因子，且每个因子由相邻的节间长度变量组成；KABC 能较明显地根据小叶杨幼苗的表型性状（株高、叶片数、节数和4 个公共节间长度因子）进行分类，第二类样本在株高、叶片数、节数性状上的均值大于第一类样本；15 个种源7 个表型性状的平均变异系数为6.09% ~ 40.22%，具有较丰富的遗传多样性；平均表型分化系数为17.6%，且种源内变异大于种源间变异。小叶杨幼苗节间长度的相关性反映了幼苗生长特性，对小叶杨幼苗表型性状的关联分析可用于林业的多性状选择育种，也为进一步全基因组关联分析奠定了基础。

Abstract: Measurements on April 29th, May 20th, June 4th, June 17th 2017 were carried out on height, leaf number, internode length and number of 1-year Populus simonii seedlings from 15 provenances.Quantitative analysis on internode length of tested provenances demonstrated that the upper part had faster growth, and neighboring internode had similar growth rate.Analysis by K-means clustering (KABC) algorithm on phenotypic traits variation of samples resulted that mean coefficient of variation ranged 6.09%-40.22%, indicating rich genetic diversity.The average phenotypic differentiation coefficient was 17.6%, and the variation within provenances was greater than that among provenances.

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