Genetic dissection of bread wheat diversity and identification of adaptive loci in response to elevated tropospheric ozone. (9th September 2020)

• Record Type: Journal Article
• Authors: Begum, Hasina; Alam, Muhammad Shahedul; Feng, Yanru; Koua, Patrice; Ashrafuzzaman, Md; Shrestha, Asis; Kamruzzaman, Mohammad; Dadshani, Said; Ballvora, Agim; Naz, Ali Ahmad; Frei, Michael
• Is Part Of: Plant, cell and environment. Volume 43:Number 11(2020)
• Page Start: 2650
• Page End: 2665
• Publication Date: 2020-09-09
• Subjects: air pollution -- cereals -- cytochrome P450 proteins -- genome‐wide association study -- global change -- molecular breeding -- ozone stress tolerance -- vegetation indices; Plant physiology -- Periodicals; Plant cells and tissues -- Periodicals; Plant communities -- Periodicals; 581.105
• DOI: 10.1111/pce.13864
• Languages: English
• ISSNs: 0140-7791

Abstract

Abstract: Rising tropospheric ozone affects the performance of important cereal crops thus threatening global food security. In this study, genetic variation of wheat regarding its physiological and yield responses to ozone was explored by exposing a diversity panel of 150 wheat genotypes to elevated ozone and control conditions throughout the growing season. Differential responses to ozone were observed for foliar symptom formation quantified as leaf bronzing score (LBS), vegetation indices and yield components. Vegetation indices representing the carotenoid to chlorophyll pigment ratio (such as Lic2) were particularly ozone‐responsive and were thus considered suitable for the non‐invasive diagnosing of ozone stress. Genetic variation in ozone‐responsive traits was dissected by a genome‐wide association study (GWAS). Significant marker‐trait associations were identified for LBS on chromosome 5A and for vegetation indices (NDVI and Lic2) on chromosomes 6B and 6D. Analysis of linkage disequilibrium (LD) in these chromosomal regions revealed distinct LD blocks containing genes with a putative function in plant redox biology such as cytochrome P450 proteins and peroxidases. This study gives novel insight into the natural genetic variation in wheat ozone response, and lays the foundation for the molecular breeding of tolerant wheat varieties. Abstract : Bread wheat ( Triticum aestivum L.) shows substantial variation in response to elevated ozone in yield, symptom formation and vegetation indices. This phenotypic variation was genetically dissected by genome‐wide association study.