Abstract
In this investigation, the effect of salt stress on Portulaca oleracea L. was monitored at salinity levels of 100 and 300 mM NaCl. At a concentration of 100 mM NaCl there was a decrease in stomatal conductance (gs) simultaneously with an increase in CO2 assimilation (A) at the beginning of salt exposure (day 3). However, the leaf water potential (ψw), the substomatal concentration of CO2 (Ci), the maximum quantum yield of photosystem II (Fv/Fm), and the proline and malondialdehyde (MDA) content remained unchanged. Exposure to 300 mM NaCl caused a decrease in gs from day 3 and a decrease in water potential, CO2 assimilation, and Fv/Fm from day 9. There was a large increase in proline content and a significantly higher MDA concentration on days 6 and 9 of salt stress compared to the control group. After 22 days of exposure to 300 mM NaCl, there was a transition from the C4 cycle to crassulacean acid metabolism (CAM), manifested by a rapid increase in substomatal CO2 concentration and negative CO2 assimilation values. These results document the tolerance of P. oleracea to a lower level of salt stress and the possibility of its use in saline localities.
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Claims 12
Claim · model-written summary
At 100 mM NaCl, stomatal conductance decreased on day 3.
- Taxon
- Portulaca oleracea L.
Portulaca oleraceat0 - Treatment
- 100 mM NaCle0
- Outcome
- stomatal conductance (gs)e0
- Direction
- decreasee0
- Qualifier
- day 3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a concentration of 100 mM NaCl there was a decrease in stomatal conductance (gs) simultaneously with an increase in CO2 assimilation (A) at the beginning of salt exposure (day 3).”
t0“Portulaca oleracea L.”
Claim · model-written summary
At 100 mM NaCl, CO2 assimilation increased on day 3.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 100 mM NaCle0
- Outcome
- CO2 assimilation (A)e0
- Direction
- increasee0
- Qualifier
- day 3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At a concentration of 100 mM NaCl there was a decrease in stomatal conductance (gs) simultaneously with an increase in CO2 assimilation (A) at the beginning of salt exposure (day 3).”
t0“Portulaca oleracea L.”
Claim · model-written summary
At 300 mM NaCl, stomatal conductance decreased from day 3.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- gse0
- Direction
- decreasee0
- Qualifier
- day 3e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 300 mM NaCl caused a decrease in gs from day 3 and a decrease in water potential, CO2 assimilation, and Fv/Fm from day 9.”
t0“Portulaca oleracea L.”
Claim · model-written summary
At 300 mM NaCl, water potential decreased from day 9.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- water potentiale0
- Direction
- decreasee0
- Qualifier
- day 9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 300 mM NaCl caused a decrease in gs from day 3 and a decrease in water potential, CO2 assimilation, and Fv/Fm from day 9.”
t0“Portulaca oleracea L.”
Claim · model-written summary
At 300 mM NaCl, CO2 assimilation decreased from day 9.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- CO2 assimilatione0
- Direction
- decreasee0
- Qualifier
- day 9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 300 mM NaCl caused a decrease in gs from day 3 and a decrease in water potential, CO2 assimilation, and Fv/Fm from day 9.”
t0“Portulaca oleracea L.”
Claim · model-written summary
At 300 mM NaCl, Fv/Fm decreased from day 9.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- Fv/Fme0
- Direction
- decreasee0
- Qualifier
- day 9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to 300 mM NaCl caused a decrease in gs from day 3 and a decrease in water potential, CO2 assimilation, and Fv/Fm from day 9.”
t0“Portulaca oleracea L.”
Claim · model-written summary
Proline content increased greatly at 300 mM NaCl.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- salt stresse0
- Outcome
- proline contente0
- Direction
- increasee0
- Qualifier
- days 6 and 9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a large increase in proline content and a significantly higher MDA concentration on days 6 and 9 of salt stress compared to the control group.”
t0“Portulaca oleracea L.”
Claim · model-written summary
MDA concentration was significantly higher on days 6 and 9 of salt stress.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- salt stresse0
- Outcome
- MDA concentratione0
- Direction
- highere0
- Qualifier
- days 6 and 9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a large increase in proline content and a significantly higher MDA concentration on days 6 and 9 of salt stress compared to the control group.”
t0“Portulaca oleracea L.”
Claim · model-written summary
At 100 mM NaCl, leaf water potential, substomatal CO2, Fv/Fm, proline and MDA remained unchanged.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 100 mM NaCle1
- Outcome
- leaf water potential (ψw), the substomatal concentration of CO2 (Ci), the maximum quantum yield of photosystem II (Fv/Fm), and the proline and malondialdehyde (MDA) contente0
- Direction
- remained unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the leaf water potential (ψw), the substomatal concentration of CO2 (Ci), the maximum quantum yield of photosystem II (Fv/Fm), and the proline and malondialdehyde (MDA) content remained unchanged.”
e1“100 mM NaCl”
t0“Portulaca oleracea L.”
Claim · model-written summary
After 22 days at 300 mM NaCl, photosynthesis transitioned from C4 to CAM.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- transition from the C4 cycle to crassulacean acid metabolism (CAM)e0
- Qualifier
- After 22 dayse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 22 days of exposure to 300 mM NaCl, there was a transition from the C4 cycle to crassulacean acid metabolism (CAM), manifested by a rapid increase in substomatal CO2 concentration and negative CO2 assimilation values.”
t0“Portulaca oleracea L.”
Claim · model-written summary
Substomatal CO2 increased rapidly after 22 days at 300 mM NaCl.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- substomatal CO2 concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 22 days of exposure to 300 mM NaCl, there was a transition from the C4 cycle to crassulacean acid metabolism (CAM), manifested by a rapid increase in substomatal CO2 concentration and negative CO2 assimilation values.”
t0“Portulaca oleracea L.”
Claim · model-written summary
CO2 assimilation became negative after 22 days at 300 mM NaCl.
- Taxon
- Portulaca oleracea L.Portulaca oleraceat0
- Treatment
- 300 mM NaCle0
- Outcome
- negative CO2 assimilation valuese0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 22 days of exposure to 300 mM NaCl, there was a transition from the C4 cycle to crassulacean acid metabolism (CAM), manifested by a rapid increase in substomatal CO2 concentration and negative CO2 assimilation values.”
t0“Portulaca oleracea L.”
The same questions in other papers
sodium chloride · physiology: oxidative · Portulaca oleraceaResults agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.