scholarly journals Genome-Wide Association Study for Pre-harvest Sprouting Resistance in a Large Germplasm Collection of Chinese Wheat Landraces

2017 ◽  
Vol 08 ◽  
Author(s):  
Yong Zhou ◽  
Hao Tang ◽  
Meng-Ping Cheng ◽  
Kwame O. Dankwa ◽  
Zhong-Xu Chen ◽  
...  
Keyword(s):  
Association Study ◽  
Genome Wide Association Study ◽  
Germplasm Collection ◽  
Genome Wide Association ◽  
Genome Wide ◽  
Wheat Landraces ◽  
Sprouting Resistance ◽  
Chinese Wheat

scholarly journals Genome-wide association study of pre-harvest sprouting resistance in Chinese wheat founder parents

2017 ◽  
Vol 40 (3) ◽  
pp. 620-629 ◽  
Author(s):  
Yu Lin ◽  
Shihang Liu ◽  
Yaxi Liu ◽  
Yujiao Liu ◽  
Guoyue Chen ◽  
...  
Keyword(s):  
Association Study ◽  
Genome Wide Association Study ◽  
Genome Wide Association ◽  
Genome Wide ◽  
Sprouting Resistance ◽  
Chinese Wheat

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 A genome-wide association study of 23 agronomic traits in Chinese wheat landraces

2017 ◽  
Vol 91 (5) ◽  
pp. 861-873 ◽  
Author(s):  
Yaxi Liu ◽  
Yu Lin ◽  
Shang Gao ◽  
Zhanyi Li ◽  
Jian Ma ◽  
...  
Keyword(s):  
Association Study ◽  
Genome Wide Association Study ◽  
Agronomic Traits ◽  
Genome Wide Association ◽  
Genome Wide ◽  
A Genome ◽  
Wheat Landraces ◽  
Chinese Wheat

scholarly journals Genome-Wide Association Study Reveals Genetic Architecture of Septoria Tritici Blotch Resistance in a Historic Landrace Collection

2021 ◽  
Author(s):  
Anik Dutta ◽  
Daniel Croll ◽  
Bruce A. McDonald ◽  
Simon G. Krattinger
Keyword(s):  
Genetic Diversity ◽  
Association Study ◽  
Genome Wide Association Study ◽  
Phenotypic Variability ◽  
Genome Wide Association ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Genome Wide ◽  
A Genome ◽  
Wheat Landraces

Abstract Septoria tritici blotch (STB), caused by the fungus Zymoseptoria tritici, is a major constraint in global wheat production. The lack of genetic diversity in modern elite wheat cultivars largely hinders the improvement of STB resistance. Wheat landraces are reservoirs of untapped genetic diversity, which can be exploited to find novel STB resistance genes or alleles. Here, we characterized 188 Swiss wheat landraces for resistance to STB using four Swiss Z. tritici isolates. We used a genome-wide association study (GWAS) to identify genetic variants associated with the amount of lesion and pycnidia production by the fungus. The majority of the landraces were highly resistant for both traits to the isolate 1E4, indicating a gene-for-gene relationship, while higher phenotypic variability was observed against other isolates. GWAS detected a significant SNP on chromosome 3A that was associated with both traits in the isolate 1E4. The resistance response against 1E4 was likely controlled by the Stb6 gene. Sanger sequencing revealed that the majority of these ~100-year-old landraces carry the Stb6 resistance allele. This indicates the importance of this gene in Switzerland during the early 1900s for disease control in the field. Our study demonstrates the importance of characterizing historic landrace collections for STB resistance to provide valuable information on resistance variability and contributing alleles. This will help breeders in the future to make decisions on integrating such germplasms in STB resistance breeding.

scholarly journals Genome-Wide Association Study Reveals Candidate Genes Involved in Fruit Trait Variation in Persian Walnut (Juglans regia L.)

2021 ◽  
Vol 11 ◽  
Author(s):  
Anthony Bernard ◽  
Julie Crabier ◽  
Armel S. L. Donkpegan ◽  
Annarita Marrano ◽  
Fabrice Lheureux ◽  
...  
Keyword(s):  
Association Study ◽  
Candidate Genes ◽  
Fruit Quality ◽  
Genome Wide Association Study ◽  
Juglans Regia ◽  
Snp Array ◽  
Germplasm Collection ◽  
Genome Wide Association ◽  
Genome Wide ◽  
A Genome

Elucidating the genetic determinants of fruit quality traits in walnut is essential to breed new cultivars meeting the producers and consumers’ needs. We conducted a genome-wide association study (GWAS) using multi-locus models in a panel of 170 accessions of Juglans regia from the INRAE walnut germplasm collection, previously genotyped using the AxiomTMJ. regia 700K SNP array. We phenotyped the panel for 25 fruit traits related to morphometrics, shape, volume, weight, ease of cracking, and nutritional composition. We found more than 60 marker-trait associations (MTAs), including a highly significant SNP associated with nut face diameter, nut volume and kernel volume on chromosome 14, and 5 additional associations were detected for walnut weight. We proposed several candidate genes involved in nut characteristics, such as a gene coding for a beta-galactosidase linked to several size-related traits and known to be involved in fruit development in other species. We also confirmed associations on chromosomes 5 and 11 with nut suture strength, recently reported by the University of California, Davis. Our results enhance knowledge of the genetic control of important agronomic traits related to fruit quality in walnut, and pave the way for the development of molecular markers for future assisted selection.

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