scholarly journals Identification of Genetic Loci of Black Point in Chinese Common Wheat by Genome-Wide Association Study and Linkage Mapping

Plant Disease ◽  
2020 ◽  
Vol 104 (7) ◽  
pp. 2005-2013 ◽  
Author(s):  
Guoguo Lv ◽  
Zhongdong Dong ◽  
Yudan Wang ◽  
Junyou Geng ◽  
Jia Li ◽  
...  
Keyword(s):  
Association Study ◽  
Linkage Mapping ◽  
Genome Wide Association Study ◽  
Wheat Breeding ◽  
Genome Wide Association ◽  
Common Disease ◽  
Wheat Cultivars ◽  
Black Point ◽  
Genome Wide ◽  
A Genome

Black point is a common disease in wheat all over the world. The disease could downgrade wheat quality and cause human health problems. In this study, 406 wheat cultivars were used to investigate black point resistance. In the field tests, 20, 65.5, and 14.5% of the tested cultivars were resistant, moderately resistant, and susceptible, respectively, suggesting that improving black point resistance is necessary in Chinese wheat breeding. A genome-wide association study (GWAS) identified 386 single-nucleotide polymorphisms (SNPs) significantly related to black point resistance in the tested wheat cultivars, and they were located on all chromosomes. Linkage mapping in a biparental population identified three quantitative trait loci (QTL) for black point resistance—QBP.hau-3A, QBP.hau-6D, and QBP.hau-7D—with 6.76, 7.79, and 8.84% phenotypic variation explained, respectively. Based on both the GWAS and linkage analyses, QBP.hau-6D covered six significant SNPs from the GWAS, and the position of these SNPs indicated that this QTL is a new locus for black point resistance. This study provides valuable germplasm for breeding wheat cultivars with resistance to black point and information for further understanding of molecular and genetic basis of black point resistance.

Genome-wide Association Study of Kernel Black Point Resistance in Chinese Wheat Landraces

Plant Disease ◽  
2021 ◽  
Author(s):  
Hao Tang ◽  
Zhi Tan ◽  
Xiangxiang Wang ◽  
Lisheng Yang ◽  
Guo-Yue Chen ◽  
...  
Keyword(s):  
Association Study ◽  
Genome Wide Association Study ◽  
Genome Wide Association ◽  
Black Point ◽  
Incidence Data ◽  
Wheat Kernel ◽  
Genome Wide ◽  
A Genome ◽  
Wheat Landraces ◽  
Chinese Wheat

Black point (BP) disease of wheat has become a noticeable problem in China. The symptoms are brown to black in color around the wheat kernel embryo or in the endosperm, resulting in a significant reduction of wheat grain quality. Here, we evaluated 272 Chinese wheat landraces for BP reaction and performed a genome-wide association study (GWAS) to identify BP resistance quantitative trait loci (QTL) in five field environments without artificial inoculation. The BP incidence data showed continuous distributions and had low to moderate correlations between environments (r = 0.094 – 0.314). Among the 272 landraces, 11 had 0.1% to 4.9%, 144 had 5% to 14.9%, and 100 had 15% to 29.9%, and 17 had over 30% incidence. We found three resistant accessions: WH094 (3.33%), AS661463 (2.67%), and AS661231 (2.67%), which can be used in breeding programs to enhance BP resistance. We identified 11 QTL, which explained 8.22% to 10.99% phenotypic BP variation and mapped them to eight wheat chromosomes. Three of the QTL were novel. The molecular markers for the BP resistance could facilitate molecular breeding for developing BP resistant cultivars.

scholarly journals The Genetic Architecture of Grain Yield in Spring Wheat Based on Genome-Wide Association Study

2021 ◽  
Vol 12 ◽  
Author(s):  
Yuyao Li ◽  
Jingquan Tang ◽  
Wenlin Liu ◽  
Wenyi Yan ◽  
Yan Sun ◽  
...  
Keyword(s):  
Grain Yield ◽  
Association Study ◽  
Spring Wheat ◽  
Genetic Architecture ◽  
Genome Wide Association Study ◽  
Wheat Breeding ◽  
Genome Wide Association ◽  
Nucleotide Polymorphisms ◽  
Genome Wide ◽  
A Genome

Uncovering the genetic architecture for grain yield (GY)–related traits is important for wheat breeding. To detect stable loci for GY-related traits, a genome-wide association study (GWAS) was conducted in a diverse panel, which included 251 elite spring wheat accessions mainly from the Northeast of China. In total, 52,503 single nucleotide polymorphisms (SNPs) from the wheat 55 K SNP arrays were used. Thirty-eight loci for GY-related traits were detected and each explained 6.5–16.7% of the phenotypic variations among which 12 are at similar locations with the known genes or quantitative trait loci and 26 are likely to be new. Furthermore, six genes possibly involved in cell division, signal transduction, and plant development are candidate genes for GY-related traits. This study provides new insights into the genetic architecture of GY and the significantly associated SNPs and accessions with a larger number of favorable alleles could be used to further enhance GY in breeding.

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