Genetic dynamics of earlier maturity group emergence in south-to-north extension of Northeast China soybeans
- PDF / 3,244,562 Bytes
- 19 Pages / 595.276 x 790.866 pts Page_size
- 46 Downloads / 218 Views
ORIGINAL ARTICLE
Genetic dynamics of earlier maturity group emergence in south‑to‑north extension of Northeast China soybeans Mengmeng Fu1 · Yanping Wang2 · Haixiang Ren2 · Weiguang Du2 · Deliang Wang3 · Rongjun Bao4 · Xingyong Yang5 · Zhongyan Tian6 · Lianshun Fu7 · Yanxi Cheng8 · Jiangshun Su9 · Bincheng Sun10 · Jinming Zhao1,2 · Junyi Gai1,2 Received: 22 June 2019 / Accepted: 24 January 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Key message This population genetic study is characterized with direct comparisons of days to flowering QTL–allele matrices between newly evolved and originally old maturity groups of soybeans to explore its evolutionary dynamics using the RTM-GWAS procedure. Abstract The Northeast China (NEC) soybeans are the major germplasm source of modern soybean production in Americas (> 80% of the world total). NEC is a relatively new soybean area in China, expanded after its nomadic status in the seventeenth century. At nine sites of four ecoregions in NEC, 361 varieties were tested for their days to flowering (DTF), a geography-sensitive trait as an indicator for maturity groups (MGs). The DTF reduced obviously along with soybeans extended to higher latitudes, ranging in 41–83 days and MG 000-III. Using the RTM-GWAS (restricted two-stage multilocus model genome-wide association study) procedure, 81 QTLs with 342 alleles were identified, accounting for 77.85% genetic contribution (R2 = 0.01–7.74%/locus), and other 20.75% (98.60–77.85%, h2 = 98.60%) genetic variation was due to a collective of unmapped QTLs. With soybeans northward, breeding effort made the original MG I–III evolved to MG 0-00-000. In direct comparisons of QTL–allele matrices among MGs, the genetic dynamics are identified with local exotic introduction/migration (58.48%) as the first and selection against/exclusion of positive alleles causing new recombination (40.64%) as the second, while only a few allele emergence/mutation happened (0.88%, limited in MG 0, not in MG 00-000). In new MG emergence, 24 QTLs with 19 candidate genes are the major sources. A genetic potential of further DTF shortening (13–21 days) is predicted for NEC population. The QTL detection in individual ecoregions showed various ecoregion-specific QTLs–alleles/genes after co-localization treatment (removing the random environment shifting ones).
Introduction Soybean [Glycine max (L.) Merr.] has been one of the crops extended most fast worldwide in the recent century, covering at least from 35° S to 53° N latitudes in all the six continents due to its plentiful protein (~ 40%) and oil (~ 20%) contents (Hartman et al. 2011; Jia et al. 2014; Watanabe et al. 2012). Soybean is a typical short-photoperiod crop, along with its extension from the temperate zone northward to cold zone Communicated by David A Lightfoot. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00122-020-03558-4) contains supplementary material, which is available to authorized users. * Junyi Gai [email protected]
Data Loading...