摘要
以杉木(Cunninghamia lanceolata)一代育种园中的自由授粉子代为对照,研究杉木第3代育种园中生长性状遗传变异性大小,了解经高强度与多世代选择后,杉木第3代育种园的群体遗传基础是否变窄,为高世代遗传改良提供科学依据。在此基础上,根据第3代亲本的自由授粉试验林的分析结果,逆向选择了若干亲本家系,同时还估计了前向选择的单株遗传力,为杉木第四代改良做准备。结果表明:(1)相对于一代育种群体,经多世代选择,树高性状在三代育种园的遗传基础没有窄化,高世代育种具有良好的前景;(2)遂昌杉木三代试验林的树高性状,有较高的遗传变异性,家系遗传力在0.8以上,单株遗传力在0.3以上;树高的遗传变异性超过一代育种园的遗传变异性:GCV在10%左右变动;(3)遂昌东丈试点的1年生树高超过群体平均值的共有18个家系,1年生树高超过群体半倍的标准差(68.1939cm)的家系有两个:b105-3;b42-3;郑岗岭试点的两年生树高超过群体平均值的共有13个家系,1年生树高超过群体半倍的标准差(2.9049m)的家系有两个:龙2代混,b03-3;(4)两个试点的杉木造林成活率较高,说明参试杉木对试验环境适应性较好。其中,东丈试点成活率最高的家系亦有两个:B109-3,b13-3;郑岗岭试点成活率最高的家系有龙2代混,a09-3,1339双,a76-3,b145-3,b03-3等六个家系。
The first open pollination test plantation of Chinese fir was selected as the reference,and the genetic variability of growth traits of the parents open pollination test plantation in the third-generation primary seed orchards of Chinese fir was studied to understand whether the genetic basis of the third-generation breeding population had been narrowed,so as to provide a scientific basis for genetic improvement of higher generation.Based on the results of the third-generation experiment,certain better families of Chinese fir third-generation were selected in the backward selection,and the individual heritability of forward selection was estimated,so as to prepare for the fourth-generation improvement of Chinese fir.The results demonstrated as follows:(1)Compared with the first-generation breeding population,the genetic basis of tree height traits in the third-generation breeding plant was not narrowed after multi-generation breeding selection,and the high-generation breeding has a promising prospect;(2)The seedling height traits of the third-generation test forest of Chinese fir in Suichang had higher genetic variability,and the heritability of family was above 0.8,and the individual heritability was above 0.3.The variability of seedling height was relatively moderation:GCV about 10%.(3)There were 18 families with annual seedling height exceeding the population average in Dongzhang site of Suichang,and there were two families with annual seedling height exceeding times half of the standard deviation(68.1939 cm)of the population:B105-3 and B42-3;(4)In Zhenggangling site,there were 13 families in which the biennial seedling height was higher than the population on average,and there were two families in which the two-year seedling height was more than times half of the standard deviation(2.9049 m)of the population:the mixed Long second-generation,B03-3;(5)The survival rate of Chinese fir plants in the two sites was relatively higher,which indicated that Chinese fir in the experiment had better adaptability to the experimental environment.Among them,there were two families with the highest survival rate in Dongzhang site:B109-3 and B13-3 respectively.Six families were included in the families with the highest survival rate in the site of Zhenggangling:the mixed Long second-generation,a09-3,biclonal-1339,a76-3,b145-3,and b03-3.
作者
包小梅
华朝晖
叶金俊
王海蓉
齐明
何贵平
BAO Xiaomei;HUA Chaohui;YEI Jingjun;WANG Hailong;QI Ming;HE Guiping(Zhejiang Suichang Eco-Forestry Development Center,Suichang 323300,China;Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Fuyang 311400,China)
出处
《四川林业科技》
2022年第1期24-30,共7页
Journal of Sichuan Forestry Science and Technology
基金
浙江省“十三五”林木新品种育种专项(2016C02056-5)
中国林业科学研究院院所基金(195005)。
关键词
杉木
高世代育种群体
遗传变异性
比较研究
早期评选
Chinese fir
Advanced generations breeding population
Genetic variability
Comparative study
Early appraisal and preliminary selection