Acta Agriculturae Boreali-Sinica ›› 2024, Vol. 39 ›› Issue (6): 64-75. doi: 10.7668/hbnxb.20195086

Special Issue: Wheat Drought and water saving Biotechnology

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

Genome-wide Association Study of Tiller Related Traits in Wheat under Water and Drought Conditions

PANG Zhiyuan1, CHENG Yukun1, GUO Xiaoling1,2, REN Yi1, GENG Hongwei1   

  1. 1 College of Agronomy,Xinjiang Agricultural University,Special High Quality Triticeae Crops Engineering and Technology Research Center,Urumqi 830052,China
    2 Qitai Wheat Experimental Station,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China
  • Received:2024-05-17 Published:2024-12-28

Abstract:

Tiller-related traits are important characteristics of wheat plant type,which determine plant structure and affect grain yield.In order to understand the inheritance and drought resistance of tiller-related traits in wheat under different water conditions,and to excavate the loci related to tiller-related traits,240 wheat varieties (lines) were selected as the subjects of this study,based on the phenotypic identification of tiller angle,effective tiller number and yield per unit area under normal irrigation (NI) and drought stress (DS) conditions,and the comprehensive evaluation of drought resistance,combined with 90K gene chip,genome-wide association study (GWAS) was to identify genetic loci for tiller-related traits and to screen for superior germplasm.The tiller angle,effective tiller number and yield per unit area showed significant difference,and the coefficient of variation ranged from 0.07 to 0.33.According to D-value,the drought resistance of Zhongyou 206 was the best.A total of 54 stable genetic loci significantly associated with tiller angle and other traits were detected, distributed on all chromosomes except 3D, 4D and 5D. Three identical stable loci were commonly detected under both treatments, located on chromosomes 2B, 4B, and 6B. Additionally, four pleiotropic loci were commonly detected in different traits, located on chromosomes 2B, 2D, and 5B.At the same time,the haplotype analysis of Ra_c491_902 (R2=5.45%—17.91%),which was significantly correlated with tiller angle on chromosome 2B,showed that there were three haplotypes:TA-Hap1,TA-Hap2 and TA-Hap3,the haplotypes (lines) containing TA-Hap1 were mainly derived from Huanghuai winter wheat regain.Five candidate genes related to tiller angle were screened by screening the stable genetic loci detected under different treatments.Gene annotation of the genes selected on Ra_c491_902 showed that the genes encoding cytochrome P450 family protein can be used as important genes such as regulating tillering angle,plant drought resistance and defense,to explore the association between genes and phenotype,and lay the foundation for the genetic improvement of tiller-related traits in wheat.

Key words: Wheat, Tiller trait, Drought stress, GWAS, Haplotype, Candidate gene

Cite this article

PANG Zhiyuan, CHENG Yukun, GUO Xiaoling, REN Yi, GENG Hongwei. Genome-wide Association Study of Tiller Related Traits in Wheat under Water and Drought Conditions[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(6): 64-75. doi: 10.7668/hbnxb.20195086.

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