付家林场樟子松种质资源表型多样性评价OA

[Objective]To reveal the phenotypic differentiation degree and variation patterns among different provenances of Pinus sylvestris var.mongolica.[Method]A total of 74 germplasm resources from four provenances at the Superior Seed Base of the Fujia Mechanized Forest Farm in Changtu County were studied.Genetic diversity and genetic differentiation of seven phenotypic traits,including twig,needle,and sheath characteristics,were investigated.[Result]Significant differences were observed for the seven phenotypic traits both within and among populations,indicating abundant overall genetic variation.The phenotypic variation coefficient ranged from 1.97％to 18.93％(mean 10.42％),and the diversity index ranged from 1.95 to 2.04(mean 1.99).The degree of variation for the traits,in descending or-der,was:twig width>needle width>needle length>twig length>needle thickness>sheath width>sheath length.The mean phenotypic differentiation coefficient(Vst)among provenances was 51.50％,indicating comparable levels of variation within and among populations.Specifically,among-provenance variation was relatively large for needle length and sheath width,accounting for 83.50％and 84.38％of the total variation,respectively.Among-provenance variation for needle width(68.75％of total varia-tion)was also greater than within-provenance variation.Variation in the other phenotypic traits was pri-marily derived from within-provenance sources.[Conclusion]Phenotypic variation among different prove-nances of Pinus sylvestris var.mongolica is abundant.Some traits(e.g.,needle length,sheath width,needle width)exhibit variation primarily among provenances,while most traits are dominated by within-provenance variation.These findings provide a scientific basis for the efficient utilization and genetic im-provement of Pinus sylvestris var.mongolica germplasm resources.