| Autor: |
Wang, Xin, Hu, Yafei, He, Weiming, Yu, Kang, Zhang, Chi, Li, Yiwen, Yang, Wenlong, Sun, Jiazhu, Li, Xin, Zheng, Fengya, Zhou, Shengjun, Kong, Lingrang, Ling, Hongqing, Zhao, Shancen, Liu, Dongcheng, Zhang, Aimin |
| Zdroj: |
Plant Communications; 20220101, Issue: Preprints |
| Abstrakt: |
Triticum urartuis the progenitor of the A subgenome in tetraploid and hexaploid wheat. Uncovering the landscape of genetic variations in T. urartuwill help us understand the evolutionary and polyploid characteristics of wheat. Here, we investigated the population genomics of T. urartuby genome-wide sequencing of 59 representative accessions collected around the world. A total of 42.2 million high-quality single nucleotide polymorphisms (SNPs) as well as 3.0 million insertions and deletions (InDels) were obtained by mapping reads to the reference genome. The ancient T. urartupopulation experienced a significant reduction in effective population size (Ne) from ∼3,000,000 to ∼140,000 and subsequently split into eastern Mediterranean coastal (EMC) and Mesopotamian-Transcaucasian (MT) populations during the Younger Dryas period. A map of allelic drift paths displayed splits and mixtures between different geographic groups, and a strong genetic drift towards hexaploid wheat was also observed, indicating that the direct donor of the A subgenome originated from northwestern Syria. Genetic changes were disclosed between the EMC and MT populations in genes orthologous to those regulating plant development and response to stresses. Furthermore, the genome-wide association study (GWAS) identified two SNPs in the exonic regions of the SEMI-DWARF 37(SD37) orthologue that corresponded to the different T. urartuecotype groups. Our study provides novel insights into the origin and genetic legacy of the A subgenome in polyploid wheat and contributes a gene repertoire to genomics-enabled improvements in wheat breeding. |
| Databáze: |
Supplemental Index |
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