摘要
辛夷的长期低产已成为其产业化发展的重要限制因子。以产量为中心 ,对 7个辛夷品种15个性状的遗传参数作了测定 ,并分析了产量选择指标 ,建立了产量选择指数。结果表明 :( 1)产量的重复力为 0 .69,遗传变异 42 .9% ,直接选择遗传增益 60 .3% ;百蕾质量与单枝蕾数的重复力分别为 0 .73和 0 .65 ,遗传变异系数 82 %和 43.7% ,产量相关选择效率 96.1%和 96.2 % ,是产量选择的重要指标 ;而总蕾数的重复力仅为 0 .2 4,遗传变异系数 16.9% ,产量相关选择效率仅 1% ,不能作为产量选择的指标。 ( 2 )叶长、叶宽、叶面积、叶质量等叶片性状与产量性状间存在着显著的遗传正相关。其中 ,叶面积和叶宽与产量的相关重复力较高 ,相关选择效率分别达 99.9%、97.5 % ,也是产量相关选择的重要指标。 ( 3)以单枝蕾数、百蕾质量和叶面积构成的产量选择指数 ,选择响应 3.85 9kg·株 -1,遗传增益 72 .1% ,比直接选择增效 19.5 %。 ( 4)不同品种产量指数选择的顺序为‘腋花’、‘四季’、‘铜锤’、‘桃实’、‘望春’、‘小桃’、‘奶嘴’。
Low yield of Xinyi (the flower bud of Magnolia ) has become the main factor to hinder the development of Xinyi industry. Focused on the yield,this paper analyzes the genetic parameters of 15 characters and selective index of yield for 7 varieties of Flos Magnolia . Results of analysis show that the heretability of Y (Xinyi yield) is 0.69,genetic variation 42.9%, and genetic gain by direct selection 60.3%. M f(mass of hundred floses ) and N f (flos number per branch),whose heretabilities are 0.73 and 0.65,genetic variations 43.7% and 82%,correlative selective efficiencies 96.1% and 96.2% respectively,are two main characters for the selection of Y , but the heretability of N t (total number of flos) only 0.24,and the efficiency of correlative selection for Y only 1%,may not be regared as the selective character. Leaf characters have significant genetic correlation with Y ,in which A l(area per leaf) and W l (width of leaf),whose selective efficiencies for Y 96.1% and 96.2% respectively,are two indirect characters for the selection of Y . Moreover,the selective index of yield,made of N f, M f and A l,has response (3.859 kg per tree) and genetic gain (72.1%),increase the efficiency 19.5% than by direct selection. Based on the index ,the sequence of different varieties is ‘Axilliflora’,‘Sijihua’,‘Tongchui’,‘Ovata’,‘Biondii’,‘Xiaotao’and ‘Naizui’.
出处
《林业科学研究》
CSCD
北大核心
1999年第4期350-356,共7页
Forest Research
基金
中国林业科学研究院 1999~ 2 0 0 1年科学技术发展基金
关键词
辛夷
选择指数
遗传参数
产量
Xinyi
Magnolia
selective index
genetic parameter
