Abstract
Laboratory expenments were conducted to evaluate the effects of increased so11 salinity on gas exchange functlonlng and growth of the braclush-marsh grass Spartlna patens (Alt) Muhl under controlled soil redox potentials (Eh) which were malntalned at either aerobic (+489 mV) or hypoxlc (-40 mV) conditions Plants were subjected to salinities of 0 5, 15 and 25 ppt gradually over a 7 d penod and leaf tissue chlorophyll content, gas exchange and growth responses were measured Leaf hssue chlorophyll content was not affected by the treatments Gas exchange of S patens was adversely influenced by increases in salinity Leaf conductance was reduced by 36 % and net photosynthesis by 23 % of control plants under aeration plus 25 ppt salinity and water use efficiency increased to 161 % of control plants When increased salinity accompanied hypoxia leaf conductance and net photosynthesis were reduced by 60 and 44 % of control plants respectively The Interaction between sallnity and hypoxla was not significant Sahnity of 25 ppt reduced root dry weight leaf dry weight and height growth sign~f~cantly Sallnlty and hypoxla combined affected various biomass components whlle hypoxla pnmanly affected root dry weights Elevated salinity and hypoxia also adversely affected gas exchange functions and growth Results presented suggested that saltwater intrusion is a malor factor contnbuting to the rapid rate of marsh deterioration in coastal Lolusiana (USA) brackish marshes which are dormnated by S patens
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Claims 11
Claim · model-written summary
Leaf tissue chlorophyll content was not affected by the treatments.
- Taxon
- Spartina patens
Sporobolus pumilust0 - Treatment
- treatmentse0
- Outcome
- chlorophyll contente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf hssue chlorophyll content was not affected by the treatments”
t0“Spartina patens”
Claim · model-written summary
Gas exchange of S patens was adversely influenced by increasing salinity.
- Taxon
- S patensSporobolus pumiluse1
- Treatment
- increases in salinitye1
- Outcome
- Gas exchangee1
- Direction
- adversely influencede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Gas exchange of S patens was adversely influenced by increases in salinity”
t0“Spartina patens”
Claim · model-written summary
Under 25 ppt salinity with aeration, leaf conductance was reduced by 36 % compared with control plants.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- 25 ppt salinitye2
- Outcome
- Leaf conductancee2
- Direction
- reducede2
- Value
- 36 %e2
- Comparator
- control plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Leaf conductance was reduced by 36 % and net photosynthesis by 23 % of control plants under aeration plus 25 ppt salinity and water use efficiency increased to 161 % of control plants”
t0“Spartina patens”
Claim · model-written summary
Under 25 ppt salinity with aeration, net photosynthesis was reduced by 23 % compared with control plants.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- 25 ppt salinitye2
- Outcome
- net photosynthesise2
- Direction
- reducede2
- Value
- 23 %e2
- Comparator
- control plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Leaf conductance was reduced by 36 % and net photosynthesis by 23 % of control plants under aeration plus 25 ppt salinity and water use efficiency increased to 161 % of control plants”
t0“Spartina patens”
Claim · model-written summary
Under 25 ppt salinity with aeration, water use efficiency increased to 161 % of control plants.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- 25 ppt salinitye2
- Outcome
- water use efficiencye2
- Direction
- increasede2
- Value
- 161 %e2
- Comparator
- control plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Leaf conductance was reduced by 36 % and net photosynthesis by 23 % of control plants under aeration plus 25 ppt salinity and water use efficiency increased to 161 % of control plants”
t0“Spartina patens”
Claim · model-written summary
When increased salinity accompanied hypoxia, leaf conductance was reduced to 60 % of control plants.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- increased salinity accompanied hypoxiae3
- Outcome
- leaf conductancee3
- Direction
- reducede3
- Value
- 60e3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“When increased salinity accompanied hypoxia leaf conductance and net photosynthesis were reduced by 60 and 44 % of control plants respectively”
t0“Spartina patens”
Claim · model-written summary
When increased salinity accompanied hypoxia, net photosynthesis was reduced to 44 % of control plants.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- increased salinity accompanied hypoxiae3
- Outcome
- net photosynthesise3
- Direction
- reducede3
- Value
- 44 %e3
- Comparator
- control plantse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“When increased salinity accompanied hypoxia leaf conductance and net photosynthesis were reduced by 60 and 44 % of control plants respectively”
t0“Spartina patens”
Claim · model-written summary
The interaction between salinity and hypoxia was not significant.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- sallnity and hypoxlae4
- Outcome
- Interactione4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The Interaction between sallnity and hypoxla was not significant”
t0“Spartina patens”
Claim · model-written summary
Salinity of 25 ppt significantly reduced root dry weight, leaf dry weight and height growth.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- Sahnity of 25 ppte5
- Outcome
- root dry weight leaf dry weight and height growthe5
- Direction
- reducede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Sahnity of 25 ppt reduced root dry weight leaf dry weight and height growth sign~f~cantly”
t0“Spartina patens”
Claim · model-written summary
Elevated salinity and hypoxia adversely affected gas exchange functions and growth.
- Taxon
- Spartina patensSporobolus pumilust0
- Treatment
- Elevated salinity and hypoxiae7
- Outcome
- gas exchange functions and growthe7
- Direction
- adversely affectede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Elevated salinity and hypoxia also adversely affected gas exchange functions and growth”
t0“Spartina patens”
Claim · model-written summary
Saltwater intrusion is a major factor contributing to the rapid rate of marsh deterioration in Spartina patens brackish marshes of coastal Louisiana.
- Taxon
- S patensSporobolus pumiluse1
- Treatment
- saltwater intrusione0
- Outcome
- rapid rate of marsh deterioratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“saltwater intrusion is a malor factor contnbuting to the rapid rate of marsh deterioration in coastal Lolusiana (USA) brackish marshes”
e1“which are dormnated by S patens”
The same questions in other papers
salinity · physiology: photosynthesis · Sporobolus pumilusResults 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.