Identifying the Genome-wide Sequence Variations and Developing New Molecular Markers for Genetics Research by Re-sequencing a Landrace Cultivar of Foxtail Millet

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2013 Sep 17

PMID 24039970

Citations 34

Authors

Hui Bai

Yinghao Cao

Jianzhang Quan

Li Dong

Zhiyong Li

Yanbin Zhu

Lihuang Zhu

Zhiping Dong

Dayong Li

Affiliations

Soon will be listed here.

Abstract

Foxtail millet (Setariaitalica) is a drought-resistant, barren-tolerant grain crop and forage. Currently, it has become a new model plant for cereal crops and biofuel grasses. Although two reference genome sequences were released recently, comparative genomics research on foxtail millet is still in its infancy. Using the Solexa sequencing technology, we performed genome re-sequencing on one important foxtail millet Landrace, Shi-Li-Xiang (SLX). Compared with the two reference genome sequences, the following genetic variation patterns were identified: 762,082 SNPs, 26,802 insertion/deletion polymorphisms of 1 to 5 bp in length (indels), and 10,109 structural variations (SVs) between SLX and Yugu1 genomes; 915,434 SNPs, 28,546 indels and 12,968 SVs between SLX and Zhang gu genomes. Furthermore, based on the Yugu1 genome annotation, we found out that ~ 40% SNPs resided in genes containing NB-ARC domain, protein kinase or leucine-rich repeats, which had higher non-synonymous to synonymous SNPs ratios than average, suggesting that the diversification of plant disease resistance proteins might be caused by pathogen pressure. In addition, out of the polymorphisms identified between SLX and Yugu1, 465 SNPs and 146 SVs were validated with more than 90% accuracy, which could be used as DNA markers for whole-genome genotyping and marker-assisted breeding. Here, we also represented an example of fine mapping and identifying a waxy locus in SLX using these newly developed DNA markers. This work provided important information that will allow a deeper understanding of the foxtail millet genome and will be helpful for dissecting the genetic basis of important traits in foxtail millet.

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