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Growth response of 98 barley ( Hordeum vulgare L.) genotypes to elevated CO 2 and identification of related quantitative trait loci using genome‐wide association studies
Author(s) -
Mitterbauer Esther,
Enders Matthias,
Bender Jürgen,
Erbs Martin,
Habekuß Antje,
Kilian Benjamin,
Ordon Frank,
Weigel HansJoachim
Publication year - 2017
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12501
Subject(s) - biology , quantitative trait locus , hordeum vulgare , genome wide association study , genotype , biomass (ecology) , crop , genetic association , single nucleotide polymorphism , association mapping , hordeum , genetics , agronomy , poaceae , gene
Elevated CO 2 ( eCO 2 ) concentrations can stimulate crop growth, but little is known about intraspecific variability in the response to eCO 2 and the underlying genetics in cereals. Field experiments over two years with 98 barley genotypes were conducted in open‐top chambers ( OTC s) under ambient CO 2 (400 ppm) and eCO 2 (700 ppm) concentrations. At crop maturity, different fractions of aboveground biomass ( AGB ) were measured, and genome‐wide association studies ( GWAS s) were conducted to identify quantitative trait loci ( QTL ). Averaged across all genotypes, eCO 2 significantly enhanced AGB by 15%, while the increase in culm and ear biomass alone was not significant. The AGB response to eCO 2 of the individual genotypes ranged from c. −36% to +95% compared with ambient CO 2 ( aCO 2 ), showing a large variability of growth responses. In GWAS , 51 associations between SNP markers and the relative changes ( eCO 2 / aCO 2 ) in biomass were detected on different chromosomes. Loci potentially involved in biomass alterations under eCO 2 were identified. The wide range of variability in responses might be exploited by marker‐based breeding for climate‐resilient barley.