南方农业学报2023，Vol.54Issue(12)：3502-3513,12.DOI:10.3969/j.issn.2095-1191.2023.12.005
茄子青枯病抗性遗传效应分析
Genetic effect of eggplant resistance to bacterial wilt
摘要
Abstract
[Objective]The genetic law of bacterial wilt resistance in eggplant was analyzed to provide theoretical ba-sis for cross breeding and disease resistance breeding.[Method]Using 4 eggplant germplasm as parents,the combining ability analysis of bacterial wilt resistance in each combination was conducted by Griffing complete diallel crossing method;At the same time,the six generation genetic populations(P1,P2,F1,F2,BC1P1,BC1P2)of two cross combinations"SG19×Y23"and"B1×BC03"were constructed respectively.The combined generation analysis method of major gene+ multiple gene for quantitative traits was used to analyze the genetic model of bacterial wilt resistance in each generation.[Result]The general combining ability of resistance to eggplant bacterial wilt was much higher than that of special com-bining ability,indicating that the resistance was mainly additive effect,followed by non-additive effect,and was less in-fluenced by cytoplasmic genetic inheritance.The generalized heritability was 69.8%,and the narrow heritability was 63.3%,and the resistance was partly influenced by environment.The best cross combinations of resistance to bacterial wilt were"Y23×NO21"and"NO21×Y23".The resistance of the hybrid combination"SG19×Y23"and"B1×BC03"was in line with the"MX2-ADI-ADI"genetic model,that is,it was controlled by two pairs of additive-dominance-epistatic effect major genes + additive-dominance-epistatic effect multiple genes.The additive effect was dominant,and the dis-ease susceptibility showed incomplete dominance.The BC1P2 and F2 populations were mainly inherited by major genes,with a heritability rate of 77.1%to 88.4%.The BC1P1 population was mainly inherited by multiple genes,with a heritabil-ity rate of 35.3%to 75.1%.The optimal genetic model estimated by the onset period was consistent with the optimal model estimated by the disease grade distribution.[Conclusion]In the breeding process of bacterial wilt resistance,attention should be paid to the use of additive effect,as far as possible to select strong bacterial wilt resistance parents for cross breeding;The theory of controlling bacterial wilt resistance with two pairs of major genes and multiple genes can be used as the basis for resistance gene mapping to carry out subsequent gene mapping related work to avoid blindness of resis-tance gene mining.关键词
茄子/青枯病/遗传分析/双列杂交/主基因+多基因Key words
Eggplant/Bacterial wilt/Genetic analysis/Diallel crossing/Major gene+polygene分类
农业科技引用本文复制引用
郑洁明,李永强,吴元彩,王鹏,阳燕娟,于文进..茄子青枯病抗性遗传效应分析[J].南方农业学报,2023,54(12):3502-3513,12.基金项目
国家自然科学基金项目(31660568) （31660568）
广西科技重大专项(桂科AA22068088-2) National Natural Science Foundation of China(31660568) （桂科AA22068088-2）
Guangxi Science and Technology Major Special Project(Guike AA22068088-2) （Guike AA22068088-2）
