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国外紫花苜蓿种质资源表型性状与品质多样性分析 被引量:34

Diversity Analysis of Phenotypic Traits and Quality Characteristics of Alfalfa( Medicago sativa) introducted from abroad Germplasm Resources
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摘要 本研究旨在利用形态指标、农艺性状指标和品质性状指标探讨引进紫花苜蓿(Medicago sativa L.)种质资源的遗传多样性,为紫花苜蓿品种改良和亲本选择提供科学依据。研究了不同地理来源的75份紫花苜蓿种质资源的21项指标,并利用主成分分析和聚类分析方法分析其多样性。结果表明,不同紫花苜蓿种质的各个特征存在广泛变异,农艺性状变异最大,其次是形态性状和品质性状;主成分分析结果显示前8个主成分累计贡献率达到82.7748%,其中茎秆干重、单株干重、单株鲜重、叶干重4个性状是构成紫花苜蓿种质表型差异的主要因素;以21个性状为基础的聚类分析将所研究的75份种质材料分为5类,其中第Ⅱ类群的3号材料和第Ⅰ类群的25、31号材料农艺性状表现较好,可以作为苜蓿新品种选育和改良的优异亲本材料。 The objective of this research is to explore the genetic diversity of alfalfa germplasm resources by morphological traits,agronomic traits, quality traits and to provide basis for variety improvement and parent choice. Total of 21 traits were investigated on 75 alfalfa accessions which were collected from different geographical areas. The 21 traits were analyzed by principal component analysis and cluster analysis. The results showed that there were extensive variations in morphological traits, agronomic traits, and quality traits in different alfalfa accessions. The most significant variance was agronomic traits ,followed by morphological traits and quality traits. Principal component analysis showed that the additive contributing rate of first eight principal components was 82. 7748% ,four major discriminating characteristics were selected to reflect the comprehensive agronomic characters. Stem dry weight, leaf dry weight, plant fresh weight and plant dry weight were the main factors which produced morphological variation of 75 wild alfalfa accessions. Based on the 21 indexes ,cluster analysis showed that all 75 accessions of alfalfa were divided into 5 groups. The No. 3 of the second group and No. 25, No. 31 accessions of the first group had better agronomic traits compared to others,which could be excellent parent materials for the breeding and improvement of Medicago sativa L.
出处 《植物遗传资源学报》 CAS CSCD 北大核心 2018年第1期103-111,共9页 Journal of Plant Genetic Resources
基金 国家国际科技合作专项(2015DFR30570-4) 山西省农业科学院育种工程项目(17yzgc113) 现代农业牧草产业技术体系建设专项(CARS-35-25) 农作物种质资源保护与利用专项(2016NWB036-30)
关键词 紫花苜蓿 形态性状 农艺性状 品质性状 变异分析 alfalfa morphological traits agronomic traits quality traits diversity analysis
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