Abstract
Madrid, E.N.; Armitage, A.R., and Quigg, A., 2012. The response of photosystem II to soil salinity and nutrients in wetland plant species of the Northwestern Gulf of Mexico. The photosynthetic response of many wetland plant species to soil salinity and nutrients has been described in the laboratory, but less is known about the cumulative effect of these abiotic factors in the natural environment. In this investigation we correlated field measurements of chlorophyll fluorescence with simultaneous measurements of soil nitrogen and phosphorus content, soil salinity, and relative leaf nitrogen content in Spartina alterniflora (Loisel), Spartina patens ((Aiton) Muhl), Schoenoplectus californicus ((C.A. Mey.) Steud.) and Schoenoplectus robustus ((Pursh) M.T. Strong), common in brackish and salt marshes of the northwestern Gulf of Mexico. The relationship between chlorophyll fluorescence and soil N ∶ P ratio was not significant in S. alterniflora, nonlinear in S. patens and S. robustus, and significant and positive in S. californicus. The relationship between leaf nitrogen content and effective quantum yield was significant and positive in S. alterniflora and S. robustus, but only S. alterniflora appeared to be able to increase relative leaf nitrogen content over a wide range of soil nutrient and salinity regimes. Schoenoplectus californicus had the greatest potential for photosynthetic light capture but also had the narrowest ecological distribution. Thus, the species best adapted to high levels of abiotic stress (S. alterniflora) was less dominant at lower salinities, and the species with the highest potential for photosynthetic performance (S. robustus and S. californicus) were only found in locations with favorable abiotic conditions. We found that the range of environmental conditions experienced by each species in the field is greater than what has been considered in laboratory investigations.
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Claims 13
Claim · model-written summary
Soil N to P ratio was not significantly related to chlorophyll fluorescence in S. alterniflora.
- Taxon
- S. alterniflora
Sporobolus alternifloruse0 - Outcome
- chlorophyll fluorescencee0
- Setting
- soil N ∶ P ratioe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between chlorophyll fluorescence and soil N ∶ P ratio was not significant in S. alterniflora”
Claim · model-written summary
The fluorescence relation with soil N to P ratio was nonlinear in S. patens.
- Taxon
- S. patens
Sporobolus pumiluse0 - Outcome
- nonlineare0
- Setting
- soil N ∶ P ratioe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nonlinear in S. patens and S. robustus”
t0“The Response of Photosystem II to Soil Salinity and Nutrients”
e1“The relationship between chlorophyll fluorescence and soil N ∶ P ratio was not significant in S. alterniflora”
Claim · model-written summary
The fluorescence relation with soil N to P ratio was nonlinear in S. robustus.
Not reportedDirection
Verbatim
e0“nonlinear in S. patens and S. robustus”
t0“The Response of Photosystem II to Soil Salinity and Nutrients”
e1“The relationship between chlorophyll fluorescence and soil N ∶ P ratio was not significant in S. alterniflora”
Claim · model-written summary
Chlorophyll fluorescence was positively related to soil N to P ratio in S. californicus.
- Taxon
- S. californicus
Schoenoplectus californicuse0 - Outcome
- chlorophyll fluorescencet0
- Direction
- positivee0
- Setting
- soil N ∶ P ratiot0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant and positive in S. californicus.”
t0“The relationship between chlorophyll fluorescence and soil N ∶ P ratio was not significant in S. alterniflora”
Claim · model-written summary
Leaf nitrogen content was positively related to effective quantum yield in S. alterniflora.
- Taxon
- S. alternifloraSporobolus alternifloruse0
- Organ / stage
- leafe0
- Outcome
- effective quantum yielde0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between leaf nitrogen content and effective quantum yield was significant and positive in S. alterniflora and S. robustus”
Claim · model-written summary
Leaf nitrogen content was positively related to effective quantum yield in S. robustus.
Verbatim
e0“The relationship between leaf nitrogen content and effective quantum yield was significant and positive in S. alterniflora and S. robustus”
Claim · model-written summary
S. alterniflora increased relative leaf nitrogen content over a wide range of nutrient and salinity regimes.
- Taxon
- S. alternifloraSporobolus alternifloruse0
- Outcome
- relative leaf nitrogen contente0
- Direction
- increasee0
- Qualifier
- over a wide range of soil nutrient and salinity regimese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only S. alterniflora appeared to be able to increase relative leaf nitrogen content over a wide range of soil nutrient and salinity regimes.”
Claim · model-written summary
S. californicus had the greatest potential for photosynthetic light capture.
- Taxon
- Schoenoplectus californicusSchoenoplectus californicuse0
- Outcome
- potential for photosynthetic light capturee0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Schoenoplectus californicus had the greatest potential for photosynthetic light capture but also had the narrowest ecological distribution.”
Claim · model-written summary
S. californicus had the narrowest ecological distribution.
- Taxon
- Schoenoplectus californicusSchoenoplectus californicuse0
- Outcome
- ecological distributione0
- Direction
- narroweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Schoenoplectus californicus had the greatest potential for photosynthetic light capture but also had the narrowest ecological distribution.”
Claim · model-written summary
S. alterniflora was less dominant at lower salinity.
- Taxon
- S. alternifloraSporobolus alternifloruse0
- Outcome
- dominante0
- Direction
- lesse0
- Setting
- lower salinitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the species best adapted to high levels of abiotic stress (S. alterniflora) was less dominant at lower salinities”
Claim · model-written summary
S. robustus occurred only where abiotic conditions were favorable.
Verbatim
e0“S. robustus and S. californicus) were only found in locations with favorable abiotic conditions.”
Claim · model-written summary
S. californicus occurred only where abiotic conditions were favorable.
- Taxon
- S. californicusSchoenoplectus californicuse0
- Outcome
- only found in locations with favorable abiotic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S. robustus and S. californicus) were only found in locations with favorable abiotic conditions.”
Claim · model-written summary
Field conditions spanned a wider range than those considered in laboratory investigations.
Verbatim
e0“the range of environmental conditions experienced by each species in the field is greater than what has been considered in laboratory investigations.”
t0“Wetland Plant Species”