苜蓿多叶品系BC_(2)群体农艺性状改良效果研究  

Improvement Effect of Agronomic Traits in the BC_(2) Population of Multifoliate Alfalfa

作　　者：吴嘉龙 魏臻武[1] Omer Idris Olom WU Jia-long;WEI Zhen-wu;Omer Idris Olom(College of Animal Science and Technology/Institute of Forage and Grassland Science,Yangzhou University,Yangzhou,Jiangsu Province 225009,China)

机构地区：[1]扬州大学动物科学与技术学院/扬州大学草业科学研究所,江苏扬州225009

出　　处：《草地学报》2021年第3期488-494,共7页Acta Agrestia Sinica

基　　金：国家自然科学基金(30972136);上海市科技兴农项目“紫花苜蓿冬季栽培及轮作双减关键技术的研究示范”(沪农科推字(2020)第1-2号);江苏省现代农业产业技术体系(JATS[2018]079)资助。

摘　　要：为研究苜蓿(Medicago sativa L.)多叶品种回交后代的农艺性状改良效果,本研究以‘淮阴苜蓿’为轮回亲本,多叶苜蓿‘PL34HQ’为非轮回亲本,获得BC2(回交二代)材料,对其株高、多叶率、分枝数等数据进行相关、聚类和主成分分析。结果显示:BC2群体材料在综合性状上偏向于轮回亲本‘淮阴苜蓿’,但仍有不少植株能保留高多叶特性;在欧式距离30处,BC2群体可分为5类,综合了轮回亲本‘淮阴苜蓿’和非轮回亲本‘PL34HQ’优良性状的第Ⅴ类占群体的51%;主成分分析所得4个主成分因子对各农艺性状变异累计贡献率为86.21%,其中主成分因子Y3代表苜蓿的多叶性状,贡献率为20.56%。通过综合评价得分,本研究筛选出了10个优良株系,且5号单株代表多叶性状的第3主成分得分极高,可作为重点选育对象。This study separately chose‘Huaiyin alfalfa’and‘PL34HQ’as recurrent parent and nonrecurrent parent to obtain BC2 generation to study the improving effect of agronomic traits of backcrossing generation.The plant height,multifoliate rate and branching number were measured and analyzed using the analysis of correlation,cluster and principal component.The results showed that the comprehensive characters of BC2 generation material tended to the recurrent parent‘Huaiyin alfalfa’,but many plants still retained the characteristics of high multifoliate rate.As for Euclidean distance 30,BC2 groups were divided into five types,and theⅤgroup accounted for 51%of the population,which combined the excellent characters of recurrent parent‘Huaiyin alfalfa’and non-recurrent parent‘PL34HQ’.The results of principal component analysis indicated that the cumulative contribution rate of four principal components to the variation of agronomic traits was 86.21%.The contribution rate of Y3 representing the multifoliate characteristics of alfalfa was 20.56%.Ten excellent lines were screened out through comprehensive evaluation scores.The multifoliate traits of No.5 single plant had a very high score the third principal component,so it could be used as the key breeding object.

关 键 词：苜蓿 回交二代 农艺性状 多叶性状 

分 类 号：S551.7[农业科学—作物学]