Quantitative trait locus mapping of yield and plant height in autotetraploid alfalfa (Medicago sativa L.)

文献类型： 外文期刊

第一作者： He, Fei

作者： He, Fei;Long, Ruicai;Zhang, Tiejun;Zhang, Fan;Wang, Zhen;Yang, Xijiang;Jiang, Xueqian;Yang, Changfu;Zhi, Xuxin;Li, Mingna;Kang, Junmei;Yang, Qingchuan;Yu, Longxi

作者机构：

关键词： Alfalfa; Yield; Plant height; Genetic linkage map; Quantitative trait loci

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2020 年 8 卷 5 期

页码：

收录情况： SCI

摘要： Alfalfa (Medicago sativa L.) is the most widely grown forage legume crop worldwide. Yield and plant height are important agronomic traits influenced by genetic and environmental factors. The objective of this study was to identify quantitative trait loci (QTL) and molecular markers associated with alfalfa yield and plant height. To understand the genetic basis of these traits, a full-sib F1 population composed of 392 individuals was developed by crossing a low-yielding precocious alfalfa genotype (male parent) with a high-yielding late-maturing alfalfa cultivar (female parent). The linkage maps were constructed with 3818 single-nucleotide polymorphism (SNP) markers on 64 linkage groups. QTL for yield and plant height were mapped using phenotypic data for three years. Sixteen QTL associated with yield and plant height were identified on chromosomes 1 to 8. Six QTL explained more than 10% of phenotypic variation, representing major loci controlling yield and plant height. One locus on chromosome 1 controlling yield traits had not been identified in previous studies. Three QTL co-located with other QTL (qyield-1 and qheight-7, qheight-5 and qyield-4, qheight-6, and qyield-6). With further validation, the markers closely linked with these QTL may be used for marker-assisted selection in breeding new alfalfa varieties with high yield. (C) 2020 Crop Science Society of China and Institute of Crop Science, CAAS. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

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