Physiological and proteomic evidence for the interactive effects of post-anthesis heat stress and elevated CO2 on wheat

Publikations-Art

Zeitschriftenbeitrag (peer-reviewed)

Autoren

Zhang, X., Högy, P., Wu, X., Schmid, I., Wang, X., Schulze, W.X., Jiang, D., Fangmeier, A.

Erscheinungsjahr

2018

Veröffentlicht in

Proteomics

DOI

10.1002/pmic.201800262

Seite (von - bis)

1800262

Elevated CO₂ promotes leaf photosynthesis and improves crop grain yield. However, as a major anthropogenic greenhouse gas, CO₂ contributes to more frequent and severe heat stress, which threatens crop productivity. The combined effects of elevated CO₂ and heat stress are complex, and the underlying mechanisms are poorly understood. In the present study, we examined the effects of elevated CO₂ and high-temperature on foliar physiological traits and the proteome of spring wheat grown under two CO₂ concentrations (380 and 550 μmol mol^-1) and two temperature conditions (ambient and post-anthesis heat stress). Elevated CO₂ increased leaf photosynthetic traits, biomass and grain yield, while heat stress depressed photosynthesis and yield. Temperature-induced impacts on chlorophyll content and grain yield were not significantly different under the two CO₂ concentrations. Analysis of the leaf proteome revealed that proteins involved in photosynthesis as well as antioxidant and protein synthesis pathways were significantly down-regulated due to the combination of elevated CO₂ and heat stress. Correspondingly, plants treated with elevated CO₂ and heat stress exhibited decreased green leaf area, photosynthetic rate, antioxidant enzyme activities and 1000-kernel weight. The present study demonstrated that future post-anthesis heat episodes will diminish the positive effects of elevated CO₂ and negatively impact wheat production