Abstract:

This study aimed to select superior provenances of Pinus koraiensis to support breeding and genetic improvement efforts in Liaoning Province.The 35-year-old provenance trial of Pinus koraiensis in the Liaoning province was conducted,measuring the height and diameter at breast height(DBH)of trees from 10 provenances from the three provinces of Northeast China,and calculating the volume.Using variance analysis,genetic parameter estimation,multiple comparisons and breeding value estimation,the study explored the genetic variation characteristics,trends,and their relationship with environmental factors.By accurately estimating the genetic parameters and breeding values of various characters,comprehensively evaluated and selected superior provenances of Pinus koraiensis.1)The differences in tree height,DBH,and individual stem volume among provenances and blocks reached significant(P<0.05)and highly significant levels.The tested provenances exhibited abundant variations in growth characters,with phenotypic variation coefficients ranging from 12.61% to 52.47%.The heritabilities of tree height,DBH,and individual stem volume were high,all exceeding 50%.2)Characters showed a trend of increase from northwest to southeast,reflecting a temperature and longitude gradient pattern,with tree height notably influenced by geographic factors.3)Based on the comprehensive breeding values for each character,provenance No.3 was identified as a superior Pinus koraiensis provenance,with a 10% selection rate.

Key words: Pinus koraiensis, provenance, variation trend, breeding value, evaluation and selection