Abstract
AbstractIntraspecific variation of response to elevated CO2 (eCO2) is a powerful option to improve crop productivity under the future climate. We evaluated genotypic variation in the biomass response to eCO2, at 200 μmol/mol above ambient CO2 (aCO2) 33 to 38 days after transplanting in 7 African rice (Oryza glaberrima Steud.) genotypes and 10 Asian rice (Oryza sativa L.) genotypes during a 3‐year experiment. A comparison at vegetative growth at aCO2, African rice genotypes showed 60% to 76% greater biomass than Asian rice genotypes. eCO2 significantly increased biomass of both species, and the magnitude of the increase was similar between the African (by 12% to 19% of averaged over three years) and Asian accessions (7 to 24%). The genotypic variation in the biomass response to eCO2 could be explained by the leaf area response rather than by the efficiency of biomass production per unit leaf area or leaf photosynthesis across the species. Dry matter partitioning to leaves determines biomass responsiveness to elevated atmospheric CO2 in comparison between African and Asian rice genotypes.
Published Version
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