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Genetic dissection of bread wheat diversity and identification of adaptive loci in response to elevated tropospheric ozone
Author(s) -
Begum Hasina,
Alam Muhammad Shahedul,
Feng Yanru,
Koua Patrice,
Ashrafuzzaman Md,
Shrestha Asis,
Kamruzzaman Mohammad,
Dadshani Said,
Ballvora Agim,
Naz Ali Ahmad,
Frei Michael
Publication year - 2020
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.13864
Subject(s) - biology , association mapping , tropospheric ozone , carotenoid , genetic diversity , quantitative trait locus , genetic variation , growing season , botany , horticulture , agronomy , ozone , gene , genetics , genotype , single nucleotide polymorphism , chemistry , population , demography , sociology , organic chemistry
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.