Work

C and N allocation on wheat under the effects of depleted, current and elevated [CO2] are modulated by water availability

Year: 2024

Type: article

Abstract: Although elevated atmospheric [CO 2 ] has substantial indirect effects on vegetation carbon uptake via associated climate change, their dynamics remain unclear. The carbon and nitrogen allocation and partitioning in durum wheat were compared at different [CO 2 ] and different water availability. The aim of this study was to investigate how the impacts of depleted and elevated [CO 2 ] driven climate change on Mediterranean wheat plants under drought conditions. For that reason, double stable isotope labelling using 13 CO 2 and 15 NH 4 – 15 NO 3 was conducted to follow 13 C and 15 N allocation and partitioning in the different plant organs. Plants were studied in growth chambers under three different CO 2 environments (depleted, current and elevated) and two water availability conditions (well-watered and mild-water-stress). Isotopic 13 C and 15 N determination, gas exchange analyses and growth parameters were measured. We show that plants subjected to depleted and elevated [CO 2 ] suffered up and down regulation of photosynthesis respectively, but their responses were both modulated by water availability. Depleted [CO 2 ] and drought reduced plant biomass. However, elevated [CO 2 ], show that the initial positive effect of elevated [CO 2 ] on carbon uptake declined rapidly, showing a consequence of physiological acclimation and the inhibition of [Rubisco] and activity, this effect was more evident in combination with drought. In both cases, depleted [CO 2 ] and elevated [CO 2 ] condition modified the C and N allocation compared with current [CO 2 ], overall combined with drought. These results obtained highlight the different C and N management strategies of wheat and provide relevant information about the potential response of plants under global climate change conditions.

Source: Plant Stress

DOI: 10.1016/j.stress.2024.100663

Authors: Salvador Aljazairi, Brigen Manikan, Xavier Serrat, Salvador Nogués

Institutions: Universidad de Granada, Universidad Internacional de La Rioja, Universitat de Barcelona

Language: English

Topic: Plant responses to elevated CO2

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDGs: Climate action, Zero hunger

Open Access status: gold

Estimated APC paid: $1,690