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Front Plant Sci. 2019 May 16;10:596. doi: 10.3389/fpls.2019.00596. eCollection 2019.

Genome-Wide Association Study for Adult-Plant Resistance to Stripe Rust in Chinese Wheat Landraces (Triticum aestivum L.) From the Yellow and Huai River Valleys.

Long L1,2, Yao F1,2, Yu C1,2, Ye X1,2, Cheng Y1,2, Wang Y1,2, Wu Y1,2, Li J1,2, Wang J1, Jiang Q1, Li W3, Ma J1,2, Liu Y1,2, Deng M1, Wei Y1,2, Zheng Y1, Chen G1,2.

Author information

1
Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China.
2
State Key Laboratory of Crop Genetics of Disease Resistance and Disease Control, Sichuan Agricultural University, Chengdu, China.
3
College of Agronomy, Sichuan Agricultural University, Chengdu, China.

Abstract

Stripe rust (also known as yellow rust), caused by the pathogen Puccinia striiformis f. sp. tritici (Pst), is a common and serious fungal disease of wheat (Triticum aestivum L.) worldwide. To identify effective stripe rust resistance loci, a genome-wide association study was performed using 152 wheat landraces from the Yellow and Huai River Valleys in China based on Diversity Arrays Technology and simple sequence repeat markers. Phenotypic evaluation of the degree of resistance to stripe rust at the adult-plant stage under field conditions was carried out in five environments. In total, 19 accessions displayed stable, high degrees of resistance to stripe rust development when exposed to mixed races of Pst at the adult-plant stage in multi-environment field assessments. A marker-trait association analysis indicated that 51 loci were significantly associated with adult-plant resistance to stripe rust. These loci included 40 quantitative trait loci (QTL) regions for adult-plant resistance. Twenty identified resistance QTL were linked closely to previously reported yellow rust resistance genes or QTL regions, which were distributed across chromosomes 1B, 1D, 2A, 2B, 3A, 3B, 4A, 4B, 5B, 6B, 7A, 7B, and 7D. Six multi-trait QTL were detected on chromosomes 1B, 1D, 2B, 3A, 3B, and 7D. Twenty QTL were mapped to chromosomes 1D, 2A, 2D, 4B, 5B, 6A, 6B, 6D, 7A, 7B, and 7D, distant from previously identified yellow rust resistance genes. Consequently, these QTL are potentially novel loci for stripe rust resistance. Among the 20 potentially novel QTL, five (QDS.sicau-2A, QIT.sicau-4B, QDS.sicau-4B.2, QDS.sicau-6A.3, and QYr.sicau-7D) were associated with field responses at the adult-plant stage in at least two environments, and may have large effects on stripe rust resistance. The novel effective QTL for adult-plant resistance to stripe rust will improve understanding of the genetic mechanisms that control the spread of stripe rust, and will aid in the molecular marker-assisted selection-based breeding of wheat for stripe rust resistance.

KEYWORDS:

Chinese wheat landraces; Diversity Arrays Technology; adult-plant resistance; genome-wide association study; simple sequence repeat; strip rust

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