Genome-Wide Association Studies for Wheat Height Under Different Nitrogen Conditions

Tingzhi Yang, Wenjiao Zhang, Yutao Cui, Yalin Wang, Huimin Qin, Xinru Lv, Xiaohan Xie, Fulin Yang, Kangzhen Ren, Jinlan Ni, Xuehuan Dai, Jianbin Zeng, Wenxing Liu, Wujun Ma, Hongsheng Zhang () and Dengan Xu ()
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Tingzhi Yang: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Wenjiao Zhang: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Yutao Cui: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Yalin Wang: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Huimin Qin: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Xinru Lv: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Xiaohan Xie: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Fulin Yang: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Kangzhen Ren: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Jinlan Ni: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Xuehuan Dai: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Jianbin Zeng: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Wenxing Liu: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Wujun Ma: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Hongsheng Zhang: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China
Dengan Xu: College of Agronomy, Qingdao Agricultural University, Qingdao 266109, China

Agriculture, 2024, vol. 14, issue 11, 1-15

Abstract: Lodging causes a reduction in wheat ( Triticum aestivum L.) yield and quality. A shorter plant height (PH) can reduce the incidence of lodging. The overuse of nitrogen promotes excessive vegetative growth, leads to taller plants, and increases lodging risk. Here, we utilized genome-wide association studies (GWASs) to explore the genetic basis of PH and the nitrogen effect index (NEI), a parameter to estimate the responses of PH under varying nitrogen conditions, using 21,201 SNP markers from the Illumina Wheat 90K SNP array. A total of 191 wheat varieties from Yellow and Huai Valley regions of China, as well as other global regions, were analyzed across two growing seasons under four nitrogen treatments, namely N 0 (0 kg/ha), N 150 (150 kg/ha), N 210 (210 kg/ha), and N 270 (270 kg/ha). GWAS results showed that 30 genetic markers were associated with PH, explaining phenotypic variance from 5.92% to 13.69%. Additionally, nine significant loci were associated with the NEI. Notably, markers on chromosomes 1A and 6B were linked to both PH and the NEI, which were insensitive to low- and high-nitrogen fertilizers. In addition, the PH of the three cultivars (Zhoumai16, Zhoumai13, and Bima1) showed little variation in four nitrogen fertilizer levels. This study identified key genetic markers associated with wheat PH and the NEI, providing insights for optimizing nitrogen use in wheat breeding.

Keywords: wheat; GWAS; nitrogen level; plant height (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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