Effect of Elevated CO2 Concentrations on Drought and Heat Tolerance of the C4-NADP Species Kochia prostrata

The effect of elevated CO 2 (eCO 2 ) on changes in the morphophysiological, biochemical, and molecular genetic parameters of the C 4 -NADP halophyte Kochia prostrata (L.) Schrad. under short-term water deficit (WD) and/or elevated temperatures (eT) was studied. The changes in the parameters of growt...

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Bibliographic Details
Published in:Russian journal of plant physiology 2024-06, Vol.71 (3), Article 85
Main Authors: Rakhmankulova, Z. F., Shuyskaya, E. V., Prokofieva, M. Yu, Kazantseva, V. V., Saidova, L. T., Zagoskina, N. V., Voronin, P. Yu
Format: Article
Language:English
Subjects:
Antioxidants
Biomass
Biomedical and Life Sciences
Carbon dioxide
Carbon dioxide concentration
Carboxylation
Catalase
Combined water
Dark adaptation
Drought
Efficiency
Electron transport
Gas exchange
Gene expression
Halophytes
Heat resistance
Heat tolerance
High temperature
Kochia prostrata
Life Sciences
Moisture content
Oxidative stress
Parameters
Phenolic compounds
Phenols
Phosphoenolpyruvate carboxylase
Photosynthesis
Photosystem II
Plant Physiology
Plant Sciences
Proline
Pyruvate phosphate dikinase
Pyruvic acid
Research Papers
Ribulose-1,5-bisphosphate
Ribulose-bisphosphate carboxylase
Salt balance
Stomata
Transpiration
Water balance
Water content
Water deficit
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Summary:The effect of elevated CO 2 (eCO 2 ) on changes in the morphophysiological, biochemical, and molecular genetic parameters of the C 4 -NADP halophyte Kochia prostrata (L.) Schrad. under short-term water deficit (WD) and/or elevated temperatures (eT) was studied. The changes in the parameters of growth, water–salt balance, CO 2 /H 2 O gas exchange, PSII efficiency, PSI cyclic electron transport (CET) activity, photosynthetic gene expression, key carboxylation enzyme content, and antioxidative system activity were studied. Plants reacted more negatively to water deficit than to other individual factors (eCO 2 or eT). The expression of genes encoding components of PSI ( psaA, psaB ), ribulose-1,5-bisphosphate carboxylase/oxygenase Rubisco ( rbcL ), and pyruvate phosphate dikinase ( PPDK ) was downregulated, and a decrease was observed in the content of the photosynthetic enzymes Rubisco and phosphoenolpyruvate carboxylase (PEPС) and fresh biomass, PSII efficiency, apparent photosynthesis, and transpiration rates, indicating a stomatal and metabolic limitation of photosynthesis associated with insufficient functioning of the C 4 carbon-concentrating mechanism. eT did not significantly affect the growth parameters and water–salt balance of K. prostrata . Decreased apparent photosynthesis intensity at eT was mainly associated with stomatal limitation (decreased transpiration). The most severe stress was caused by eT + WD. A decrease in psaA, psaB, rbcL , and PPDK expression, PSII efficiency and PSI CET activity, photosynthesis and transpiration intensity, fresh biomass and water content and an increase in proline accumulation and oxidative stress indices were observed. The effect of eCO 2 mitigated the negative effect of individual and combined water deficit and temperature stress on CO 2 /H 2 O gas exchanges (apparent photosynthesis, transpiration) but enhanced their negative effect on PSII functioning. Additionally, under eT + WD, eCO 2 contributed to a significant increase in proline content and the activation of antioxidant defense, with the participation of catalase, phenolic compounds, and PSI CET. Overall, eCO 2 affected the mechanisms of homeostatic water balance and antioxidant defense and the ratio of light and dark reactions of photosynthesis during the adaptation of K. prostrata to drought and/or eT compared with ambient CO 2 conditions.
ISSN:1021-4437
1608-3407
DOI:10.1134/S1021443724605275