柚木种源/家系种子表型变异及其与环境因子的相关性OA北大核心CSTPCD

Through the examination of the phenotypic traits of teak(Tectona grandis L.F.)seeds from diverse prove-nances and pedigrees,this study elucidated the genetic variability patterns of teak seeds and the mechanisms of response to environmental factor fluctuations,thereby fostering the conservation and genetic improvement of teak germplasm resources.Using seeds from 81 teak pedigrees representing 13 provenances across four provinces(Guangdong,Guangxi,Hainan,and Yunnan)as the experimental material,five traits,namely seed length,width,length-width ratio,length-width product,and hundred-seed weight,were quantified.Significant differences(P＜0.01)existed among the five phenotypic traits of teak seeds across provenances and pedigrees,with trait variation coefficients ranging from 10.27％to 23.88％among different pedigrees and from 4.21％to 20.32％among different provenances.Substantial cor-relations prevailed among various phenotypic traits,with varying degrees of influence on seed traits from different en-vironmental factors.Latitude,altitude,and annual precipitation were the primary determinants affecting teak seed traits,followed by annual average temperature,while the impact of annual average relative humidity was relatively minor.Distinct seed traits also exhibited heterogeneous responses to environmental changes,with seed length,seed width,and length-width product being particularly sensitive to annual precipitation,whereas length-width ratio and hundred-seed weight manifested heightened sensitivity to latitude.Cluster analysis categorized the 13 provenances into three classes.Teak seeds manifest prolific phenotypic variation across provenances and pedigrees,with seed traits being influenced by various factors,including maternal inheritance and geographical climate.The research would provide a theoretical foundation and scientific basis for the conservation and utilization of diverse teak.