Early selection efficiency for fiber dimensions and their relationships with growth and wood quality for Pinus elliotth Engelm.in southern China  

作　　者：Jing Wen Min Yi Leiming Dong Lu Zhang Siyu Liu Shenggui Yuan Xiaoxiao Tao Meng Lai 

机构地区：[1]Key Laboratory of Silviculture,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,People’s Republic of China [2]Beijing Floriculture Engineering Technology Research Centre,Beijing Botanical Garden,Beijing 100093,People’s Republic of China

出　　处：《Journal of Forestry Research》2023年第6期1951-1962,共12页林业研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.32260407);Science and Technology Leader Foundation of Jiangxi Province(No.20212BCJ23011);National Natural Science Foundation of China(No.31860220 and 32160385)。

摘　　要：A solid understanding of the efficiency of early selection for fiber dimensions is a prerequisite for breeding slash pine(Pinus elliottii Engelm.)with improved properties for pulp and paper products.Genetic correlations between size of fibers,wood quality and growth properties are also important.To accomplish effective early selection for size of fibers and evaluate the impact for wood quality traits and ring widths,core samples were collected from360 trees of 20 open-pollinated Pinus elliottii families from three genetic trials.Cores were measured by SilviScan,and the age trends for phenotypic values,heritability,early-late genetic correlations,and early selection efficiency for fiber dimensions,such as tangential and radial fiber widths,fiber wall thickness and fiber coarseness,and their correlations with microfibril angle(MFA),modulus of elasticity(MOE),wood density and ring width were investigated.Different phenotypic trends were found for tangential and radial fiber widths while fiber coarseness and wall thickness curves were similar.Age trends of heritability based on area-weighted fiber dimensions were different.Low to moderate heritability from pith to bark(~0.5)was found for all fiber dimension across the three sites except for tangential fiber width and wall thickness at the Ganzhou site.Early-late genetic correlations were 0.9 after age of 9 years,and early selection for fiber dimensions could be effective due to strong genetic correlations.Our results showed moderate to strong positive genetic correlations for modulus of elasticity and density with fiber dimensions.The effects on fiber dimensions were weak or moderate when ring width or wood quality traits were selected alone.Estimates of efficiency for early selection indicated that the optimal age for radial fiber width and fiber coarseness was 6-7 years,while for tangential fiber width and wall thickness was 9-10 years.

关 键 词：Pinus elliottii Early selection efficiency Genetic correlation HERITABILITY Fiber dimensions 

分 类 号：S791.246[农业科学—林木遗传育种]