Genome-Wide Association Study on Root System Architecture and Identification of Candidate Genes in Wheat (Triticum aestivum L.)

International Journal of Molecular Sciences

Xiaoxiao Tang¹  Mengyuan Xu¹  Jianhui Ma¹  Daijing Zhang¹  Lina Jiang¹  Dongyang Zhao¹  Haiyue Ren¹  Meng Yuan¹  Yingze Duan¹  Tian Li²  Jianhui Wu³  Dejun Han³  Qingdong Zeng³ 

[1] College of Life Science, Henan Normal University, Xinxiang 453007, China;Key Laboratory of Crop Gene Resources and Germplasm Enhancement, Ministry of Agriculture, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China;State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, Xianyang 712100, China;

关键词: Triticum aestivum L.;    root system architecture;    genome-wide association study;    quantitative trait loci;    candidate genes;   

DOI  :  10.3390/ijms23031843

来源: DOAJ

【 摘 要 】

The root tissues play important roles in water and nutrient acquisition, environmental adaptation, and plant development. In this study, a diversity panel of 388 wheat accessions was collected to investigate nine root system architecture (RSA) traits at the three-leaf stage under two growing environments: outdoor pot culture (OPC) and indoor pot culture (IPC). Phenotypic analysis revealed that root development was faster under OPC than that under IPC and a significant correlation was observed between the nine RSA traits. The 660K single-nucleotide polymorphism (SNP) chip was used for a genome-wide association study (GWAS). Significant SNPs with a threshold of −log₁₀ (p-value) ≥ 4 were considered. Thus, 36 quantitative trait loci (QTLs), including 13 QTL clusters that were associated with more than one trait, were detected, and 31 QTLs were first identified. The QTL clusters on chromosomes 3D and 5B were associated with four and five RSA traits, respectively. Two candidate genes, TraesCS2A01G516200 and TraesCS7B01G036900, were found to be associated with more than one RSA trait using haplotype analysis, and preferentially expressed in the root tissues. These favourable alleles for RSA traits identified in this study may be useful to optimise the root system in wheat.

【 授权许可】

Unknown