Genetic Analysis and Comprehensive Evaluation of Main Traits of Acacia cincinnata Clones

Abstract:

In order to breeding superior clones of Acacia cincinnata, the genetic variation and trait correlation of main traits of 15 clones at 7 year old were analyzed by variance analysis, genetic parameter estimation, correlation analysis, path analysis and comprehensive evaluation. The results showed that there were significant differences in tree height, DBH, volume and height under branches among clones, and their repeatability was 0.71, 0.64, 0.42 and 0.49, respectively. Tree height and volume were significantly correlated with other traits. The DBH was significantly correlated with stem shape at 0.05 level, but with other traits at 0.01 level. The crown width was negatively correlated with height under branches and positively correlated with stem shape. The path analysis showed that DBH had the greatest contribution to single tree volume, followed by tree height and crown width, and their direct path coefficients of DBH were 0.566 5, 0.389 9 and 0.172 8, respectively, and the total effect values were 0.904 7, 0.825 8 and 0.877 9, respectively. The selected clones were SS2, SS3 and ZJ22 with the selection rate of 20% by using Breggin’s multi-character comprehensive evaluation method, which could be considered as the comprehensive improved A. acacia clones for local promotion.

Key words:Acacia cincinnata;Clone;Genetic analysis;Path analysis;Clone selection