2021
" ... Masuya et al. (2021) write that, "in agriculture, intraspecific variation might be used to improve crop productivity in the future elevated CO2 world,"
adding that "selection of genotypes that can effectively translate elevated CO2 to biomass will be a powerful option to respond to the impacts of unstable climate and produce yield sufficient to meet the future demand for food."
... elevated CO2 "increased biomass significantly in all three years (p < .05) by similar magnitudes between the African and Asian rice led to a general stimulation of aboveground biomass in all genotypes, irrespective of origin (African or Asian).
... it increased this parameter by
"8% to 9% in Asian rice and by
13% to 21% in African rice in 2014;
by -4% to +44% in Asian rice and by
5% to 43% in African rice in 2015;
by -18% to +28% in Asian rice and by
2% to 28% in African rice in 2016."
Consequently, the mean enhancement
over all genotypes across the three year study ranged from 7% (2016) to 24% (2015) for Asian rice and from 12% (2016) to 19% (2015) in African rice.
... to meet the growing food demands of the world, scientists must learn which crop genotypes are most responsive to atmospheric CO2 enrichment ...
The rice genotypes were grown in environment-controlled sunlit chambers under flooded conditions (< 8 cm of water above the soil surface) under ambient or elevated (+200 ppm) CO2 levels.
Elevated CO2 concentrations were maintained between the hours 0330 and 1930 each day.
Plants were harvested for above ground biomass measurements 33, 36 and 38 days after transplanting in 2014, 2015 and 2016, respectively."