紫楠天然种群表型变异特征  

Phenotypic Variations in Natural Populations of Phoebe sheareri

作　　者：葛思宇 王立 陆云峰 刘伟 张俊红[1] 童再康[1] GE Si-yu;WANG Li;LU Yun-feng;LIU Wei;ZHANG Jun-hong;TONG Zai-kang(State Key Laboratory of Subtropical Silviculture,School of Forestry&Biotechnology,Zhejiang A&F University,Lin’an,Hangzhou 311300,Zhejiang,China;Ningbo Agricultural Technology Extension Station,Ningbo 315012,Zhejiang,China;Lishui Forest Resource Conservation Administration,Lishui 323000,Zhejiang,China)

机构地区：[1]浙江农林大学省部共建亚热带森林培育国家重点实验室,浙江杭州311300 [2]宁波市农业技术推广总站,浙江宁波315012 [3]丽水市森林资源保护管理总站,浙江丽水323000

出　　处：《林业科学研究》2024年第5期169-177,共9页Forest Research

基　　金：丽水市珍稀用材树种资源保育与利用(H20230153);浙江省农业新品种选育重大专项(2021C2070-10)。

摘　　要：[目的]揭示紫楠天然种群的表型变异程度及规律。[方法]以其分布区内20个种群为研究对象,运用巢式方差分析等方法,对紫楠11个表型性状及其与地理生态因子的相关性进行系统研究。[结果]紫楠11个表型性状在种群间和种群内均存在极显著差异,其变异系数为8.54%~43.75%,均值为20.83%,且6个叶片性状的平均变异系数(26.27%)高于5个种子性状(14.31%),即种子比叶片具有更大的遗传稳定性;紫楠种群间的变异(50.44%)高于种群内的变异(23.42%),平均表型分化系数为66.46%,种群间变异是紫楠表型变异的主要来源。在调查分布范围内,叶片随海拔升高而变小,呈由西向东逐渐变宽的趋势,而种子大小则表现为由东北向西南逐渐变大的趋势。依据叶片和种子性状可将20个种群聚为三大类群,基本可代表紫楠在不同分布区域的表型特征。[结论]紫楠11个表型性状在种群间和种群内均存在极显著差异,以种群间变异为主。叶片的平均变异系数高于种子,呈由西向东逐渐变宽趋势,种子则呈由东北向西南逐渐变大的趋势。聚类分析将20个紫楠天然种群依地理位置分为三大类。[Objective]To reveal the degree and pattern of phenotypic variation in natural populations of P.sheareri.[Method]Base on the 20 populations of P.sheareri in its distribution area,a systematic study of 11 phenotypic traits of P.sheareri and their correlation with geo-ecological factors was carried out through nested analysis of variance(ANOVA).[Results]There were extremely significant differences among and within populations in the 11 phenotypic traits of P.sheareri,with coefficients of variation(CoVs)ranging from 8.54%to 43.75%,with a mean value of 20.83%,and the mean CoV of six leaf traits(26.27%)was higher than that of five seed traits(14.31%),which implies that the seeds had greater genetic stability than the leaves.Inter-population variation(50.44%)of P.sheareri was higher than intra-population variation(23.42%),with an average phenotypic differentiation coefficient of 66.46%.Inter-population variation was the main source of phenotypic variation in P.sheareri.Within the surveyed distribution range,the leaves became smaller with increasing altitude,showing a trend of widening from west to east,while the seed size showed a trend of increasing from northeast to southwest.Based on the leaf and seed traits,the 20 populations could be clustered into three major groups,which basically represent the phenotypic characteristics of P.sheareri in different distribution areas.[Conclusion]There are significant differences among and within populations among the 11 phenotypic traits of P.sheareri,with inter-population variation being the main factor.The mean CoV of leaves is higher than that of seeds,showing a gradual widening trend from west to east,while seeds gradually increase from northeast to southwest.The 20 natural populations of P.sheareri are divided into three groups according to geographical location through cluster analysis.

关 键 词：紫楠 叶片性状 种子特性 表型分化 聚类分析 

分 类 号：S718.5[农业科学—林学]