Genetic variants associated with the root system architecture of oilseed rape (Brassica napus L.) under contrasting phosphate supply

Wang, Xiaohua and Chen, Yanling and Thomas, Catherine L. and Ding, Guangda and Xu, Ping and Shi, Dexu and Grandke, Fabian and Jin, Kemo and Cai, Hongmei and Xu, Fangsen and Yi, Bin and Broadley, Martin R. and Shi, Lei (2017) Genetic variants associated with the root system architecture of oilseed rape (Brassica napus L.) under contrasting phosphate supply. DNA Research . ISSN 1756-1663

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Abstract

Breeding crops with ideal root system architecture for efficient absorption of phosphorus is an important strategy to reduce the use of phosphate fertilizers. To investigate genetic variants leading to changes in root system architecture, 405 oilseed rape cultivars were genotyped with a 60K Brassica Infinium SNP array in low and high P environments. A total of 285 single-nucleotide polymorphisms were associated with root system architecture traits at varying phosphorus levels. Nine single-nucleotide polymorphisms corroborate a previous linkage analysis of root system architecture quantitative trait loci in the BnaTNDH population. One peak single-nucleotide polymorphism region on A3 was associated with all root system architecture traits and co-localized with a quantitative trait locus for primary root length at low phosphorus. Two more single-nucleotide polymorphism peaks on A5 for root dry weight at low phosphorus were detected in both growth systems and co-localized with a quantitative trait locus for the same trait. The candidate genes identified on A3 form a haplotype ‘BnA3Hap’, that will be important for understanding the phosphorus/root system interaction and for the incorporation into Brassica napus breeding programs.

Item Type: Article
Keywords: oilseed rape, root system architecture, single-nucleotide polymorphism, genome-wide association study, BnA3Hap
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences > Division of Plant and Crop Sciences
Identification Number: 10.1093/dnares/dsx013
Depositing User: Eprints, Support
Date Deposited: 26 Jun 2017 12:35
Last Modified: 26 Jun 2017 12:41
URI: http://eprints.nottingham.ac.uk/id/eprint/43766

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