Elevated Atmospheric CO2 Concentration Improved C4 Xero-Halophyte Kochia prostrata Physiological Performance under Saline Conditions

A significant increase in atmospheric CO2 concentration and associated climate aridization and soil salinity are factors affecting the growth, development, productivity, and stress responses of plants. In this study, the effect of ambient (400 ppm) and elevated (800 ppm) CO2 concentrations were eval...

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Veröffentlicht in:Plants Jg. 10; H. 3; S. 491
Hauptverfasser: Rakhmankulova, Zulfira, Shuyskaya, Elena, Toderich, Kristina, Voronin, Pavel
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Basel MDPI AG 05.03.2021
MDPI
Schlagworte:
Bassia prostrata
Biomass
Botany
Carbon dioxide
carbon dioxide enrichment
climate
Climate change
combined stress
droughts
Efficiency
elevated CO2
growth retardation
Halophytes
Kochia prostrata
Metabolism
Osmosis
Osmotic stress
Oxidation
Photosynthesis
Photosystem II
photosystems I and II
Physiology
Polyethylene glycol
Principal components analysis
Proline
QK1-989
Respiration
saline stress
Salinity
Salinity effects
Salt
Sodium chloride
Soil salinity
Stress response
synergism
Synergistic effect
Water balance
Water use
water use efficiency
ISSN:2223-7747, 2223-7747
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Zusammenfassung:A significant increase in atmospheric CO2 concentration and associated climate aridization and soil salinity are factors affecting the growth, development, productivity, and stress responses of plants. In this study, the effect of ambient (400 ppm) and elevated (800 ppm) CO2 concentrations were evaluated on the C4 xero-halophyte Kochia prostrata treated with moderate salinity (200 mM NaCl) and polyethylene glycol (PEG)-induced osmotic stress. Our results indicated that plants grown at elevated CO2 concentration had different responses to osmotic stress and salinity. The synergistic effect of elevated CO2 and osmotic stress increased proline accumulation, but elevated CO2 did not mitigate the negative effects of osmotic stress on dark respiration intensity and photosystem II (PSII) efficiency. This indicates a stressful state, which is accompanied by a decrease in the efficiency of light reactions of photosynthesis and significant dissipative respiratory losses, thereby resulting in growth inhibition. Plants grown at elevated CO2 concentration and salinity showed high Na+ and proline contents, high water-use efficiency and time required to reach the maximum P700 oxidation level (PSI), and low dark respiration. Maintaining stable water balance, the efficient functioning of cyclic transport of PSI, and the reduction of dissipation costs contributed to an increase in dry shoot biomass (2-fold, compared with salinity at 400 ppm CO2). The obtained experimental data and PCA showed that elevated CO2 concentration improved the physiological parameters of K. prostrata under salinity.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:2223-7747
2223-7747
DOI:10.3390/plants10030491