Genome assembly and population genomic analysis provide insights into the evolution of modern sweet corn

第一作者：Ying Hu

第一单位：佛罗里达大学

通讯作者：Marcio F. R. Resende Jr.

 Abstract 

背景回顾：Sweet corn is one of the most important vegetables in the United States and Canada. 

主要研究：Here, we present a de novo assembly of a sweet corn inbred line Ia453 with the mutated shrunken2-reference allele (Ia453-sh2).

测序个体的背景：This mutation accumulates more sugar and is present in most commercial hybrids developed for the processing and fresh markets. 

结果1-组装：The ten pseudochromosomes cover 92% of the total assembly and 99% of the estimated genome size, with a scaffold N50 of 222.2 Mb. This reference genome completely assembles the large structural variation that created the mutant sh2-R allele. 

结果2-比较基因组：Furthermore, comparative genomics analysis with six field corn genomes highlights differences in single-nucleotide polymorphisms, structural variations, and transposon composition. 

结果3-系统发育：Phylogenetic analysis of 5,381 diverse maize and teosinte accessions reveals genetic relationships between sweet corn and other types of maize. Our results show evidence for a common origin in northern Mexico for modern sweet corn in the U.S. 

结果4-选择：Finally, population genomic analysis identifies regions of the genome under selection and candidate genes associated with sweet corn traits, such as early flowering, endosperm composition, plant and tassel architecture, and kernel row number. 

结论：Our study provides a high-quality reference-genome sequence to facilitate comparative genomics, functional studies, and genomic-assisted breeding for sweet corn.

 摘 要 

doi: https://doi.org/10.1038/s41467-021-21380-4

Journal: Nature Communications

Published date: Feb 23, 2021