Breeding effects on durum wheat traits detected using GWAS and haplotype block analysis

Frontiers in Plant Science

Plant Science

S. Esposito¹  P. De Vita¹  F. Fania²  F. Taranto³  R. Sica⁴  G. Logozzo⁴  S. Marzario⁴  T. Gioia⁴ 

[1] Council for Agricultural Research and Economics (CREA), Research Centre for Cereal and Industrial Crops (CREA-CI), Foggia, Italy;Council for Agricultural Research and Economics (CREA), Research Centre for Cereal and Industrial Crops (CREA-CI), Foggia, Italy;Department of Agriculture, Food, Natural Resources, and Engineering (DAFNE) - University of Foggia, Foggia, Italy;Italian National Council of Research (CNR), Institute of Biosciences and Bioresources (IBBR), Bari, Italy;School of Agricultural, Forestry, Food and Environmental Sciences, University of Basilicata, Potenza, Italy;

关键词: multi-locus GWAS;    quantitative trait nucleotide (QTN);    haplotype blocks;    plant variety protection;    UPOV protocol;   

DOI  :  10.3389/fpls.2023.1206517

 received in 2023-04-15, accepted in 2023-08-08,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionThe recent boosting of genomic data in durum wheat (Triticum turgidum subsp. durum) offers the opportunity to better understand the effects of breeding on the genetic structures that regulate the expression of traits of agronomic interest. Furthermore, the identification of DNA markers useful for marker-assisted selection could also improve the reliability of technical protocols used for variety protection and registration.MethodsWithin this motivation context, 123 durum wheat accessions, classified into three groups: landraces (LR), ancient (OC) and modern cultivars (MC), were evaluated in two locations, for 34 agronomic traits, including UPOV descriptors, to assess the impact of changes that occurred during modern breeding.ResultsThe association mapping analysis, performed with 4,241 SNP markers and six multi-locus-GWAS models, revealed 28 reliable Quantitative Trait Nucleotides (QTNs) related to plant morphology and kernel-related traits. Some important genes controlling flowering time and plant height were in linkage disequilibrium (LD) decay with QTNs identified in this study. A strong association for yellow berry was found on chromosome 6A (Q.Yb-6A) in a region containing the nadh-ubiquinone oxidoreductase subunit, a gene involved in starch metabolism. The Q.Kcp-2A harbored the PPO locus, with the associated marker (Ku_c13700_1196) in LD decay with Ppo-A1 and Ppo-A2. Interestingly, the Q.FGSGls-2B.1, identified by RAC875_c34512_685 for flag leaf glaucosity, mapped less than 1 Mb from the Epistatic inhibitors of glaucousness (Iw1), thus representing a good candidate for supporting the morphological DUS traits also with molecular markers. LD haplotype block approach revealed a higher diversity, richness and length of haploblocks in MC than OC and LR (580 in LR, 585 in OC and 612 in MC), suggesting a possible effect exerted by breeding programs on genomic regions associated with the agronomic traits.DiscussionOur findings pave new ways to support the phenotypic characterization necessary for variety registration by using a panel of cost-effectiveness SNP markers associated also to the UPOV descriptors. Moreover, the panel of associated SNPs might represent a reservoir of favourable alleles to use in durum wheat breeding and genetics.

【 授权许可】

Unknown   
Copyright © 2023 Taranto, Esposito, Fania, Sica, Marzario, Logozzo, Gioia and De Vita