数字农科院2.0

Identification Of A Novel Seed S.ize Associated Locus Sw9-1 I n Soybean

文献类型: 外文期刊

作者: Li, JJ; Zhao, JH; Li, YH; Gao, YL; Hua, SN; Nadeem, M; Sun, GL; Zhang, WM; Hou, JF; Wang, XB; Qiu, LJ

作者机构:

关键词: Soybean [Glycine max (L.) Merr.]; Seed size/weight; SW9-1; Molecular breeding

期刊名称: CROP JOURNAL

ISSN: 2095-5421

年卷期: 2019 年 7 卷 4 期

页码:

收录情况: JCR(2021版) ; CSCD(2020-2021年度) ; 农林核心(2020版) ; 科技核心(2020版)

摘要: Seed size is one of the vital traits determining seed appearance, quality, and yield. Untangling the genetic mechanisms regulating soybean 100-seed weight (100-SW), seed length and seed width across environments may provide a theoretical basis for improving seed yield. However, there are few reports related to QTL mapping of 100-SW across multiple ecological regions. In this study, 21 loci associated with seed size traits were identified using a genome-wide association of 5361 single nucleotide polymorphisms (SNPs) across three ecoregions in China, which could explain 8.12%-14.25% of the phenotypic variance respectively. A new locus, named as SW9-2 on chromosome 9 that explained 10.05%-10.93% of the seed weight variance was found significantly related to seed size traits, and was not previously reported. The selection effect analysis showed that SW9-1 locus has a relatively high phenotypic effect (13.67) on 100-SW, with a greater contribution by the accessions with bigger seeds (3.69) than the accessions with small seeds (1.66). Increases in seed weight were accompanied by increases in the frequency of SW9-1T allele, with >90% of the bred varieties with a 100-SW >30 g carrying SW9-1T. Analysis of SW9-1 allelic variation in additional soybean accessions showed that SW9-1T allele accounting for 13.83% of the wild accessions, while in 46.55% and 51.57% of the landraces and bred accessions, respectively, this results indicating that the SW9-1 locus has been subjected to artificial selection during the early stages of soybean breeding, especially the utilisation of SW9-1T in edamame for big seed. These results suggest that SW9-1 is a novel and reliable locus associated with seed size traits, and might have an important implication for increasing soybean seed weight in molecular design breeding. Cloning this locus in future may provide new insights into the genetic mechanisms underlying soybean seed size traits. (C) 2019 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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