摘要
[目的]通过对思茅松自由授粉子代测试林的生长与形质性状遗传参数的估计,进行优良家系选择,为建立思茅松高世代种子园及培育优良无性系苗木提供种质资源。[方法]采用随机区组试验设计,在214个思茅松自由授粉家系子代测试林中选择胸径、地径、树高、枝下高、冠幅、通直度、树干圆满度、树冠圆满度、材积及地上生物量等生长与形质性状,利用线性混合模型进行遗传参数的估计,进行优良家系筛选。[结果]思茅松自由授粉子代测试林生长与形质性状的遗传参数在家系间差异极显著。各性状的家系遗传力较高,其中,地径的家系遗传力最大(1.105)。材积的预期遗传增益高于地上生物量,利用家系/家系内选择方法进行优良家系的筛选,材积的预期遗传增益为60.75%,入选家系为60个;地上生物量的预期遗传增益为44.22%,入选家系为66个。轮盘数、通直度和树干圆满度对材积和地上生物量都有显著影响。[结论]在早期选择中,形质性状的遗传变异对思茅松自由授粉优良家系的选择有重要参考作用,4年生思茅松自由授粉家系子代测试林中各性状存在着丰富的遗传变异,在早期选择中可以筛选出适合不同培育目标的优良家系,最大限度挖掘其遗传潜力。
[Objective] Based on genetic parameter evaluation of growth traits of open-pollinated family in Pinus kesiya var. langbianensis progenies plantation, the aims of this study are to select the second generation superior families and trees and obtain better breeding strategy. And also, it intends to provide genetic resources for higher generation seed orchard of P. kesiya var. langbianensis. [Method] Randomized complete blocks design was applied to survey the diameter at ground height （DGH）, diameter at breast height （DBH）, height, under-branch height, crown, number of internodium （NO.I）, stem straightness （SS）, stem fullness （SF）, crown fullness （CF）, volume and aboveground biomass （AGB） from 214 open-pollinated family progenies. Linear mixed model was used for genetic parameter assessment for superior families and individuals. [Result] Most of the growth traits were significantly different among the open-pollinated family progenies in P. kesiya var. langbianensis. The family heritability of all growth traits were larger than 0.5. The family heritability of DGH was the largest （1.105）. The expected genetic gain of volume was more than AGB. The results of inter-and intra-family selection showed that the genetic gain of volume was 60.75% and 60 families were chosen, while the genetic gain of AGB was 44.22% and 66 families were chosen. The correlation analysis showed that NO.I, SS, SF had a significant effect on the volume and AGB. [Conclusion] During early selection, the genetic variation of traits had a vital effect on the superior families and individuals. Four-year-old open-pollinated family progenies contained abundant genetic variation. Superior families and individuals can be selected for different breeding purposes so as to give full play of their genetic potentials.
出处
《林业科学研究》
CSCD
北大核心
2017年第6期929-935,共7页
Forest Research
基金
云南省科技计划项目(2013RA004)
林业公益性行业科研专项项目(201404211)
关键词
思茅松
自由授粉
遗传参数
家系选择
材积
地上生物量
Pinus kesiya var. langbianensis
open-pollinating
genetic parameters
family selection
volume
aboveground biomass
