Molecular characterization of doubled haploid lines derived from different cycles of the Iowa Stiff Stalk Synthetic (BSSS) maize population

Frontiers in Plant Science

Plant Science

Thomas Lübberstedt¹  Fernando Augusto Sales Ribeiro¹  Ursula Frei¹  Alejandro Ledesma¹  Alison Uberti¹  Sarah Hearne²  Jode Edwards³ 

[1] Department of Agronomy, Iowa State University, Ames, IA, United States;International Maize and Wheat Improvement Center (CIMMYT), El Batan, Texcoco, Mexico;USDA-ARS, Corn Insects and Crop Genetics Research Unit, Ames, IA, United States;

关键词: zea mays L.;    diversity;    genetic resources;    homozygous lines;    genetic diversity;   

DOI  :  10.3389/fpls.2023.1226072

 received in 2023-05-20, accepted in 2023-07-10,  发布年份 2023

来源: Frontiers

【 摘 要 】

Molecular characterization of a given set of maize germplasm could be useful for understanding the use of the assembled germplasm for further improvement in a breeding program, such as analyzing genetic diversity, selecting a parental line, assigning heterotic groups, creating a core set of germplasm and/or performing association analysis for traits of interest. In this study, we used single nucleotide polymorphism (SNP) markers to assess the genetic variability in a set of doubled haploid (DH) lines derived from the unselected Iowa Stiff Stalk Synthetic (BSSS) maize population, denoted as C0 (BSSS(R)C0), the seventeenth cycle of reciprocal recurrent selection in BSSS (BSSS(R)C17), denoted as C17 and the cross between BSSS(R)C0 and BSSS(R)C17 denoted as C0/C17. With the aim to explore if we have potentially lost diversity from C0 to C17 derived DH lines and observe whether useful genetic variation in C0 was left behind during the selection process since C0 could be a reservoir of genetic diversity that could be untapped using DH technology. Additionally, we quantify the contribution of the BSSS progenitors in each set of DH lines. The molecular characterization analysis confirmed the apparent separation and the loss of genetic variability from C0 to C17 through the recurrent selection process. Which was observed by the degree of differentiation between the C0_DHL versus C17_DHL groups by Wright’s F-statistics (FST). Similarly for the population structure based on principal component analysis (PCA) revealed a clear separation among groups of DH lines. Some of the progenitors had a higher genetic contribution in C0 compared with C0/C17 and C17 derived DH lines. Although genetic drift can explain most of the genetic structure genome-wide, phenotypic data provide evidence that selection has altered favorable allele frequencies in the BSSS maize population through the reciprocal recurrent selection program.

【 授权许可】

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Copyright © 2023 Ledesma, Ribeiro, Uberti, Edwards, Hearne, Frei and Lübberstedt