Elevated [CO2] mitigates the impacts of heat stress in eucalyptus seedlings

Elevated [CO2] mitigates the impacts of heat stress in eucalyptus seedlings

Given ongoing climate changes and their impact on plant growth and development, CO 2 effects have been extensively studied, and evidence indicates that elevated CO 2 concentration ([CO 2 ]) may mitigate the impacts of warming. However, the interaction between these two environmental factors and how...

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Bibliographic Details
Published in:Theoretical and experimental plant physiology Vol. 34; no. 4; pp. 447 - 462
Main Authors: Pinto, Samuel S., Martins, Auxiliadora O., Fontes, Luiz F. P., Oliveira, Franciele S., Almeida, Iale C., Detoni, Iagor B., Oliveira, Leonardo A., Silva, Willian B., Medeiros, David B., Picoli, Edgar A. T., Ribeiro, Aristides, Fernie, Alisdair R., DaMatta, Fábio M., Martins, Samuel C. V., Araújo, Wagner L.
Format: Journal Article
Language:English
Published: Cham Springer International Publishing 01-12-2022
Springer Nature B.V
Subjects:
Acclimation
Acclimatization
Air temperature
Amino acids
Biomedical and Life Sciences
Carbon dioxide
Carbon dioxide concentration
Chain branching
Climate change
Depletion
Environmental effects
Environmental factors
Eucalyptus
Gas exchange
Heat stress
Heat tolerance
Life Sciences
Metabolism
Parameters
Physiology
Plant biomass
Plant growth
Seedlings
Primary metabolism and photosynthesis
Metabolite profile
Growth
Plant anatomy
Global change
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Summary:Given ongoing climate changes and their impact on plant growth and development, CO 2 effects have been extensively studied, and evidence indicates that elevated CO 2 concentration ([CO 2 ]) may mitigate the impacts of warming. However, the interaction between these two environmental factors and how they impact the physiology of eucalyptus seedlings under tropical conditions remain largely unknown. Here, we evaluated the alterations in morphological, physiological and metabolic traits of seedlings of two eucalyptus clones exposed either to elevated [CO 2 ] or warming or both (using a mini-Free- Air CO 2 Enrichment (FACE) and a temperature (T-FACE system). Most parameters (e.g. growth, and gas exchange parameters) were negatively affected in response to warming. By contrast, elevated [CO 2 ] improved plant biomass accumulation via changes in primary metabolism. Such changes mainly involved depletion of starch concentration in both clones, whereas changes in the amino acids (AA) profile revealed global (increases in branched-chain AA) or clone specific (increases in aromatic AA) changes. Elevated [CO 2 ] mitigated the negative effects of environmental warming in plants exposed to these two factors simultaneously. Taken together, our results indicate that in a future scenario featuring increased [CO 2 ] and temperature the process of metabolic and physiological acclimation will likely lead to the maintenance of seedling growth.
ISSN:2197-0025
2197-0025
DOI:10.1007/s40626-022-00257-x