Changes in Whole-Plant Metabolism during the Grain-Filling Stage in Sorghum Grown under Elevated CO2 and Drought

Plant Physiology
Amanda Pereira De SouzaMarcos Silveira Buckeridge

Abstract

Projections indicate an elevation of the atmospheric CO2 concentration ([CO2]) concomitant with an intensification of drought for this century, increasing the challenges to food security. On the one hand, drought is a main environmental factor responsible for decreasing crop productivity and grain quality, especially when occurring during the grain-filling stage. On the other hand, elevated [CO2] is predicted to mitigate some of the negative effects of drought. Sorghum (Sorghum bicolor) is a C4 grass that has important economical and nutritional values in many parts of the world. Although the impact of elevated [CO2] and drought in photosynthesis and growth has been well documented for sorghum, the effects of the combination of these two environmental factors on plant metabolism have yet to be determined. To address this question, sorghum plants (cv BRS 330) were grown and monitored at ambient (400 µmol mol(-1)) or elevated (800 µmol mol(-1)) [CO2] for 120 d and subjected to drought during the grain-filling stage. Leaf photosynthesis, respiration, and stomatal conductance were measured at 90 and 120 d after planting, and plant organs (leaves, culm, roots, prop roots, and grains) were harvested. Finally, biochemical composition ...Continue Reading

Citations

Jul 6, 2016·Frontiers in Plant Science·Vanessa F OliveiraMaria A M Carvalho
Jul 14, 2017·Journal of Proteome Research·Zhou LiYanhong Yan
Jul 12, 2019·Frontiers in Genetics·Vinícius Carvalho JardimMarcos Silveira Buckeridge
Nov 19, 2020·Plants·Renan Gonçalves da SilvaSonia Marli Zingaretti

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