Abstract
Abstract. Plantago maritima L. was grown at three levels of salinity, 50, 200, 350 mol m −3 NaCl, and the effects on growth, ion content and photosynthetic capacity were studied. Shoot and root dry weight, leaf production and leaf length were all substantially reduced in plants grown at high salinity. Total leaf area of plants grown at 350 mol m −3 NaCl was only 20% of that in plants at low salinity. Both the Na + and K + content of leaves and roots increased with external salinity. There was no change in the Na + /K + ratio of leaves or roots at different salinity levels. Despite the large reductions in growth and high accumulation of Na + ions, leaf photosynthetic rate was only slightly reduced by salinity stress. The reduction in photosynthesis was not caused by reduced biochemical capacity as judged by photosynthetic response to intercellular CO 2 and by ribulose‐1,5‐bisphosphate carboxylase activity, but was due to reduced leaf conductance and low intercellular CO 2 concentration. The increased stomatal limitation of photosynthesis resulted in higher water‐use efficiency of plants grown at high salinity.
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Claims 8
Claim · model-written summary
High salinity substantially reduced shoot and root dry weight, leaf production, and leaf length.
- Taxon
- Plantago maritima L.
Plantago maritimat0 - Treatment
- high salinitye0
- Outcome
- Shoot and root dry weight, leaf production and leaf lengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot and root dry weight, leaf production and leaf length were all substantially reduced in plants grown at high salinity”
t0“Plantago maritima L.”
Claim · model-written summary
At 350 mol m −3 NaCl, total leaf area was 20% of that under low salinity.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Treatment
- 350 mol m −3 NaCle0
- Outcome
- Total leaf areae0
- Direction
- onlye0
- Value
- 20%e0
- Comparator
- low salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total leaf area of plants grown at 350 mol m −3 NaCl was only 20% of that in plants at low salinity”
t0“Plantago maritima L.”
Claim · model-written summary
Leaf and root Na content increased with external salinity.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Organ / stage
- leaves and rootse0
- Treatment
- external salinitye0
- Outcome
- Na +e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the Na + and K + content of leaves and roots increased with external salinity”
t0“Plantago maritima L.”
Claim · model-written summary
Leaf and root K content increased with external salinity.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Organ / stage
- leaves and rootse0
- Treatment
- external salinitye0
- Outcome
- K + content of leaves and rootse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the Na + and K + content of leaves and roots increased with external salinity”
t0“Plantago maritima L.”
Claim · model-written summary
Leaf and root Na/K ratios did not change across salinity levels.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Treatment
- different salinity levelse0
- Outcome
- Na + /K + ratio of leaves or rootse0
- Direction
- no changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no change in the Na + /K + ratio of leaves or roots at different salinity levels”
t0“Plantago maritima L.”
Claim · model-written summary
Salinity stress only slightly reduced leaf photosynthesis.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Treatment
- salinity stresse0
- Outcome
- leaf photosynthetic ratee0
- Direction
- reducede0
- Qualifier
- only slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf photosynthetic rate was only slightly reduced by salinity stress”
t0“Plantago maritima L.”
Claim · model-written summary
Reduced conductance and low intercellular CO2 were attributed as causes of reduced photosynthesis.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Outcome
- reduction in photosynthesise0
- Qualifier
- reduced leaf conductance and low intercellular CO 2 concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in photosynthesis was not caused by reduced biochemical capacity as judged by photosynthetic response to intercellular CO 2 and by ribulose‐1,5‐bisphosphate carboxylase activity, but was due to reduced leaf conductance and low intercellular CO 2 concentration”
t0“Plantago maritima L.”
Claim · model-written summary
Increased stomatal limitation raised water-use efficiency at high salinity.
- Taxon
- Plantago maritima L.Plantago maritimat0
- Outcome
- water‐use efficiencye0
- Direction
- highere0
- Qualifier
- increased stomatal limitation of photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increased stomatal limitation of photosynthesis resulted in higher water‐use efficiency of plants grown at high salinity”
t0“Plantago maritima L.”
The same questions in other papers
sodium chloride · growth · Plantago maritima (sea plantain)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
salinity · physiology: photosynthesis · Plantago maritima (sea plantain)Results 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.