摘要
[目的]本文旨在解析切花小菊一、二级分枝性状的变异情况和主基因遗传效应。[方法]以切花小菊‘南农雪峰’בMonalisa’F_1代为试验材料,调查了F_1分离群体的总侧芽数、中上部一级分枝数、一级分枝长度、一级分枝角度、二级分枝总数、二级分枝长度、二级分枝角度在2015年和2016年的表型变异,利用F_2群体主基因+多基因混合遗传模型方法分析了这7个分枝性状。[结果]7个分枝性状均呈连续分布,变异系数为12.89%~61.55%;各分枝性状均存在正向或负向的中亲优势和超亲分离个体,其中总侧芽数、中上部一级分枝数、一级分枝角度和二级分枝总数的中亲优势较大,中亲优势率分别为-9.69%、-9.10%、12.99%和25.51%。混合遗传分析表明,总侧芽数、二级分枝长度、一级分枝角度和二级分枝角度符合0MG模型,无主基因控制;中上部一级分枝数和二级分枝总数符合2MG-AD模型,由2对加-显性主基因控制;一级分枝长度符合1MG-AD遗传模型,由1对加性-显性主基因控制。中上部一级分枝数、一级分枝长度、二级分枝总数的主基因遗传率分别为74%、46%、72%。[结论]初步明确了切花小菊主要分枝性状的遗传变异和主基因遗传效应,对今后切花小菊的株型育种具有重要参考价值。
[Objectives]The present study is to investigate the genetic variability and major gene effect of the primary and secondary branch traits in spray cut chrysanthemum.[Methods]Seven branching traits,i.e.,total lateral bud number,up branch number,primary branch length,primary branch angle,total secondary branch number,secondary branch length,and secondary branch angle of the segregating‘Nannongxuefeng’בMonalisa’F 1 population were measured in 2015 and 2016,and the major gene effects for each branch trait were analyzed using mixed major gene plus polygene inheritance model in F 2 population.[Results]All the investigated branch traits showed continuous variations,with the coefficient of variation ranging from 12.89%to 61.55%.The phenoma of mid-paraent heterosis and extra-parent individuals existed generally for every branching trait,but transgressive heterosis was not yet to take shape in the F 1population,and the mid-paraent heterosis was relatively large for total lateral bud number,up-part primary branch number,primer branch angle and total secondary branch number,with the ratio of mid-parent heterosis calculated at-9.69%,-9.10%,12.99%and 25.51%,respectively.The mixed inheritance analysis indicated that the inheritances of total lateral bud number,secondary branch length,primary branch angle and secondary branch angle fit to the 0MG model with no major genes;the up primary branch number and total secondary branch number fit to the 2MG-AD model,governed by two pairs of major genes showing additive-dominant effect;the secondary branch length accords with the 1MG-AD model,controlled by a pair of major gene displaying additivity and part dominance or super-domimance effect.The heritability of major genes for the up-part primary branch number,primary branch length,total secondary branch number and secondary branch length were calculated at 74%,46%and 72%,respectively.[Conclusions]The findings present an insight into the genetic variability and major gene effects of important branching traits of spray cut chrysa
作者
杨信程
苏江硕
吴洋洋
张飞
管志勇
陈发棣
房伟民
YANG Xincheng;SU Jiangshuo;WU Yangyang;ZHANG Fei;GUAN Zhiyong;CHEN Fadi;FANG Weimin(College of Horticulture/Key Laboratory of Landscape Agriculture,Ministry of Agriculture,Nanjing Agricultural University,Nanjing 210095,China)
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2018年第3期440-446,共7页
Journal of Nanjing Agricultural University
基金
国家自然科学基金项目(31372092)
上海市种业发展项目[沪农科种字(2016)第1-14号]
关键词
切花小菊
分枝性
主基因+多基因混合遗传模型
遗传分析
spray cut chrysanthemum
branch traits
major gene plus polygene mixed inheritance model
genetic analysis
