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Salinity effects on CO2 assimilation and diffusive conductance of cowpea leaves
Year:
1990
Source of publication :
Physiologia Plantarum
Authors :
Plaut, Zvi
;
.
Volume :
79
Co-Authors:
Plaut, Z., Inst. of Soils and Water, ARO, Volcani Center, Bet Dagan, 50250, Israel
Grieve, C.M., US Salinity Lab, 4500 Glen wood Drive, Riverside, California, 92501, United States
Maas, E.V., US Salinity Lab, 4500 Glen wood Drive, Riverside, California, 92501, United States
Facilitators :
From page:
31
To page:
38
(
Total pages:
8
)
Abstract:
The effect of NaCl salinity at concentrations of 43–173 mM in nutrient solution on net gas exchange of attached cowpea [Vigna unguiculata (L.) Walp cv. California Black‐eye No. 5 (CB5)] leaves was investigated under both greenhouse and growth chamber conditions. There was a marked decrease in leaf conductance to water vapor after exposure to low salinity levels and a slighter decrease when salinity levels were higher. The decrease in net assimilation was much more gradual throughout the entire salinity range. The altered responses of net assimilation and leaf conductance to salinity were more evident at a high light intensity. A decrease in intercellular partial CO2 pressure [p(CO2)] was found at the low and intermediate salinity levels but not at the high level. These findings suggest that CO, assimilation was mainly controlled by stomatal conductance and the fixation of CO, might have been increased due to stimulated biochemical activity or to higher chlorophyll concentration per unit leaf area. A decrease in assimilation was already found one day after salinization and pro‐ceeded up to 4 days when it was inhibited by 50% at 43 mM NaCl and up to 85% at 173 mM. The decrease in transpiration was larger than the decrease in net assimila‐tion, and both were attributed to osmotic stress. Partial recovery was found thereaf‐ter and new steady‐state rates, in the range of 55 to 100% of the control, were then obtained for salinity levels between 43 and 130 mM. Inhibition of net CO, assimila‐tion at this stage was attributed partly to a specific sodium effect and partly to plant water status. A linear relationship between leaf sodium content and net photosynthe‐sis was also evident at this stage. Net CO, assimilation recovered more completely than transpiration when salt stress was removed, but at 173 mM NaCl recovery was neglible. Copyright © 1990, Wiley Blackwell. All rights reserved
Note:
Related Files :
Assimilation
Cowpea
Leaf conductance
net CO
Osmotic adjustment
photosynthesis
Salinity effects
Vigna unguiculata
Show More
Related Content
More details
DOI :
10.1111/j.1399-3054.1990.tb05862.x
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29553
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:47
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Scientific Publication
Salinity effects on CO2 assimilation and diffusive conductance of cowpea leaves
79
Plaut, Z., Inst. of Soils and Water, ARO, Volcani Center, Bet Dagan, 50250, Israel
Grieve, C.M., US Salinity Lab, 4500 Glen wood Drive, Riverside, California, 92501, United States
Maas, E.V., US Salinity Lab, 4500 Glen wood Drive, Riverside, California, 92501, United States
Salinity effects on CO2 assimilation and diffusive conductance of cowpea leaves
The effect of NaCl salinity at concentrations of 43–173 mM in nutrient solution on net gas exchange of attached cowpea [Vigna unguiculata (L.) Walp cv. California Black‐eye No. 5 (CB5)] leaves was investigated under both greenhouse and growth chamber conditions. There was a marked decrease in leaf conductance to water vapor after exposure to low salinity levels and a slighter decrease when salinity levels were higher. The decrease in net assimilation was much more gradual throughout the entire salinity range. The altered responses of net assimilation and leaf conductance to salinity were more evident at a high light intensity. A decrease in intercellular partial CO2 pressure [p(CO2)] was found at the low and intermediate salinity levels but not at the high level. These findings suggest that CO, assimilation was mainly controlled by stomatal conductance and the fixation of CO, might have been increased due to stimulated biochemical activity or to higher chlorophyll concentration per unit leaf area. A decrease in assimilation was already found one day after salinization and pro‐ceeded up to 4 days when it was inhibited by 50% at 43 mM NaCl and up to 85% at 173 mM. The decrease in transpiration was larger than the decrease in net assimila‐tion, and both were attributed to osmotic stress. Partial recovery was found thereaf‐ter and new steady‐state rates, in the range of 55 to 100% of the control, were then obtained for salinity levels between 43 and 130 mM. Inhibition of net CO, assimila‐tion at this stage was attributed partly to a specific sodium effect and partly to plant water status. A linear relationship between leaf sodium content and net photosynthe‐sis was also evident at this stage. Net CO, assimilation recovered more completely than transpiration when salt stress was removed, but at 173 mM NaCl recovery was neglible. Copyright © 1990, Wiley Blackwell. All rights reserved
Scientific Publication
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