Abstract
The invasion of Spartina alterniflora along the coasts of China has allowed this C4 grass to outcompete often much of the native, salt marsh vegetation, such as Phragmites australis (C3 grass), in the Yangtze Estuary. In this study, native grass, P. australis, and non-native grass, S. alterniflora, were grown in fresh and saline water (moderate salinity of 15‰ and high salinity of 30‰) to compare the effects of salinity on photosynthetic and biochemical parameters in combination with measurement temperatures. The C4 grass, S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures. The net photosynthetic rate declined significantly with increasing salinity as a result of inhibited stomatal conductance together with a greater decrease in the maximum rate of electron transport (J max). In P. australis, salt treatments shifted the optimum temperatures for the maximum rate of carboxylation by Rubisco (V cmax) and J max to lower temperatures. S. alterniflora showed a greater salt tolerance to moderate stress than that of the native grass, with lower sensitivity of V cmax, J max, and the maximum rate of phosphoenolpyruvate carboxylation. Both moderate and high stress decreased significantly stomatal conductance of S. alterniflora; high salinity reduced significantly photosynthetic efficiency and J max. Our findings indicated that the combination of stomatal conductance, enzyme activity, and electron transport affected the photosynthetic performance of the plants in response to salt treatments. The success of S. alterniflora could be probably attributed to its C4 photosynthetic pathway and the tolerance to moderate salinity. In this study, a modified parameterization of the photosynthetic model was suggested to support a more reasonable simulation of photosynthesis under salt stress.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
S. alterniflora had greater CO2 assimilation than P. australis across tested temperatures.
- Taxon
- S. alterniflora
Sporobolus alternifloruse0e1 - Direction
- greatere0
- Comparator
- P. australise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
Net photosynthetic rate declined significantly as salinity increased.
- Taxon
- P. australis
Phragmites australise0e1 - Treatment
- increasing salinitye0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate declined significantly with increasing salinity”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
Salt shifted the optimum temperature of P. australis Rubisco carboxylation to lower temperatures.
- Taxon
- P. australisPhragmites australise0e1
- Treatment
- salt treatmentse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In P. australis, salt treatments shifted the optimum temperatures for the maximum rate of carboxylation by Rubisco (V cmax) and J max to lower temperatures”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
Salt shifted the optimum temperature of P. australis J max to lower temperatures.
- Taxon
- P. australisPhragmites australise0e1
- Treatment
- salt treatmentse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In P. australis, salt treatments shifted the optimum temperatures for the maximum rate of carboxylation by Rubisco (V cmax) and J max to lower temperatures”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
S. alterniflora had greater tolerance to moderate salt stress than native grass.
- Taxon
- S. alternifloraSporobolus alternifloruse0e1
- Direction
- greatere0
- Comparator
- native grasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S. alterniflora showed a greater salt tolerance to moderate stress than that of the native grass”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
S. alterniflora V cmax, J max, and phosphoenolpyruvate carboxylation were less sensitive to moderate salt stress.
- Taxon
- S. alternifloraSporobolus alternifloruse0e1
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with lower sensitivity of V cmax, J max, and the maximum rate of phosphoenolpyruvate carboxylation”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
Moderate and high salt stress significantly decreased S. alterniflora stomatal conductance.
- Taxon
- S. alternifloraSporobolus alternifloruse0e1
- Treatment
- moderate and high stresse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both moderate and high stress decreased significantly stomatal conductance of S. alterniflora”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
High salinity significantly reduced S. alterniflora photosynthetic efficiency and J max.
- Taxon
- S. alternifloraSporobolus alternifloruse0e1
- Treatment
- high salinitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high salinity reduced significantly photosynthetic efficiency and J max”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
Stomatal conductance, enzyme activity, and electron transport jointly affected photosynthetic performance under salt treatment.
- Taxon
- plantsViridiplantaee0t0e1
- Qualifier
- combination of stomatal conductance, enzyme activity, and electron transporte0
Verbatim
e0“the combination of stomatal conductance, enzyme activity, and electron transport affected the photosynthetic performance of the plants in response to salt treatments”
t0“a native C3 and a non-native C4 marsh grass”
e1“the combination of stomatal conductance, enzyme activity, and electron transport affected the photosynthetic performance of the plants in response to salt treatments”
Claim · model-written summary
The authors attributed S. alterniflora success to its C4 pathway and moderate salt tolerance.
- Taxon
- S. alternifloraSporobolus alternifloruse0e1
- Qualifier
- C4 photosynthetic pathway and the tolerance to moderate salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The success of S. alterniflora could be probably attributed to its C4 photosynthetic pathway and the tolerance to moderate salinity”
e1“S. alterniflora, showed a greater CO2 assimilation rate than P. australis, across the tested temperatures”
Claim · model-written summary
A modified photosynthesis model parameterization was suggested for salt stress simulation.
- Taxon
- plantsViridiplantaee0t0e1
Not reportedComparatorValue
Verbatim
e0“a modified parameterization of the photosynthetic model was suggested to support a more reasonable simulation of photosynthesis under salt stress”
t0“a native C3 and a non-native C4 marsh grass”
e1“the combination of stomatal conductance, enzyme activity, and electron transport affected the photosynthetic performance of the plants in response to salt treatments”
The same questions in other papers
salinity · physiology: photosynthesis · Phragmites australis (common reed)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →salinity · physiology: photosynthesis · Sporobolus alterniflorus (smooth cordgrass)Results agree
2 papers in the same direction as this paper
- negative
- 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.