QTL Mapping by Whole Genome Re-sequencing and Analysis of Candidate Genes for Nitrogen Use Efficiency in Rice

Overview

Journal Front Plant Sci

Date 2017 Oct 7

PMID 28983307

Citations 29

Authors

Xinghai Yang

Xiuzhong Xia

Zongqiong Zhang

Baoxuan Nong

Yu Zeng

Faqian Xiong

Yanyan Wu

Ju Gao

Guofu Deng

Danting Li

Affiliations

Soon will be listed here.

Abstract

Nitrogen is a major nutritional element in rice production. However, excessive application of nitrogen fertilizer has caused severe environmental pollution. Therefore, development of rice varieties with improved nitrogen use efficiency (NUE) is urgent for sustainable agriculture. In this study, bulked segregant analysis (BSA) combined with whole genome re-sequencing (WGS) technology was applied to finely map quantitative trait loci (QTL) for NUE. A key QTL, designated as was identified on chromosome 6 and further validated by Insertion/Deletion (InDel) marker-based substitutional mapping in recombinants from F population (NIL-13B4 × GH998). Forty-four genes were identified in this 266.5-kb region. According to detection and annotation analysis of variation sites, 39 genes with large-effect single-nucleotide polymorphisms (SNPs) and large-effect InDels were selected as candidates and their expression levels were analyzed by qRT-PCR. Significant differences in the expression levels of (peptide transporter PTR2) and (asparagine synthetase) were observed between two parents (Y11 and GH998). Phylogenetic analysis in identified two closely related homologs, () and (), which share 72.3 and 87.5% amino acid similarity with and , respectively. Taken together, our results suggested that is a possible candidate gene for NUE in rice. The fine mapping and candidate gene analysis of provide the basis of molecular breeding for genetic improvement of rice varieties with high NUE, and lay the foundation for further cloning and functional analysis.

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