Genetic dissection of marker trait associations for grain micro-nutrients and thousand grain weight under heat and drought stress conditions in wheat.

Autor:	Devate NB; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Krishna H; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Mishra CN; ICAR- Indian Institute of Wheat and Barley Research, Karnal, India., Manjunath KK; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Sunilkumar VP; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Chauhan D; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Singh S; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Sinha N; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Jain N; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India., Singh GP; ICAR- Indian Institute of Wheat and Barley Research, Karnal, India., Singh PK; Division of Genetics, ICAR-Indian Agricultural research institute, New Delhi, India.
Jazyk:	angličtina
Zdroj:	Frontiers in plant science [Front Plant Sci] 2023 Jan 16; Vol. 13, pp. 1082513. Date of Electronic Publication: 2023 Jan 16 (Print Publication: 2022).
DOI:	10.3389/fpls.2022.1082513
Abstrakt:	Introduction: Wheat is grown and consumed worldwide, making it an important staple food crop for both its calorific and nutritional content. In places where wheat is used as a staple food, suboptimal micronutrient content levels, especially of grain iron (Fe) and zinc (Zn), can lead to malnutrition. Grain nutrient content is influenced by abiotic stresses, such as drought and heat stress. The best method for addressing micronutrient deficiencies is the biofortification of food crops. The prerequisites for marker-assisted varietal development are the identification of the genomic region responsible for high grain iron and zinc contents and an understanding of their genetics. Methods: A total of 193 diverse wheat genotypes were evaluated under drought and heat stress conditions across the years at the Indian Agricultural Research Institute (IARI), New Delhi, under timely sown irrigated (IR), restricted irrigated (RI) and late sown (LS) conditions. Grain iron content (GFeC) and grain zinc content (GZnC) were estimated from both the control and treatment groups. Genotyping of all the lines under study was carried out with the single nucleotide polymorphisms (SNPs) from Breeder's 35K Axiom Array. Result and Discussion: Three subgroups were observed in the association panel based on both principal component analysis (PCA) and dendrogram analysis. A large whole-genome linkage disequilibrium (LD) block size of 3.49 Mb was observed. A genome-wide association study identified 16 unique stringent marker trait associations for GFeC, GZnC, and 1000-grain weight (TGW). In silico analysis demonstrated the presence of 28 potential candidate genes in the flanking region of 16 linked SNPs, such as synaptotagmin-like mitochondrial-lipid-binding domain, HAUS augmin-like complex, di-copper center-containing domain, protein kinase, chaperonin Cpn60, zinc finger, NUDIX hydrolase, etc. Expression levels of these genes in vegetative tissues and grain were also found. Utilization of identified markers in marker-assisted breeding may lead to the rapid development of biofortified wheat genotypes to combat malnutrition. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Devate, Krishna, Mishra, Manjunath, Sunilkumar, Chauhan, Singh, Sinha, Jain, Singh and Singh.)
Databáze:	MEDLINE
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