Abstract
Attributes of the coastal halophyte Spergularia marina (L.) Griseb. that make it useful for studies of the physiological basis for salt tolerance in fully autotrophic higher plants are discussed. Growth, morphological, and ion-content characteristics are presented to serve as a background for subsequent studies of transport physiology. Plants were grown in solution culture on dilutions of artificial seawater or on the same solution without NaCl ("fresh water") from the time at which they could be conveniently transferred as seedlings (about 2 weeks old) to the onset of flowering about 5 weeks later. Eighteen days after transfer, plants growing on 0.2 × seawater were larger, being nearly twice the size of plants on fresh water. A Na + specific effect was indicated, as the major part of the growth stimulation (54%) resulted from a 1 mM NaCl supplementation of "fresh water." Succulence was not a consideration in the growth response: root length was directly proportional to weight as was leaf surface area and neither was affected by salinity. Total Na + plus K + per gram root or shoot showed little variation with salinity from 1 to 180 mM Na + levels. In roots, the relative Na + and K + contents were also little affected by salinity, but in the shoots, increasing salinity resulted in higher Na + and lower K + contents. Distribution within the shoots of 0.2 × plants showed no regions either free of or exceptionally high in Na + . The ion content and distribution patterns are compared with those in a number of other halophytes.
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 9
Claim · model-written summary
At 0.2 × seawater, plants were nearly twice as large as fresh-water plants after 18 days.
- Taxon
- Spergularia marina
_-_geograph.org.uk_-_215994.jpg?width=60)
Spergularia marinat0 - Treatment
- 0.2 × seawatere0
- Outcome
- size of plantse0
- Direction
- largere0
- Value
- nearly twicee0
- Comparator
- fresh watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_geograph.org.uk_-_215994.jpg?width=500)
Verbatim
e0“Eighteen days after transfer, plants growing on 0.2 × seawater were larger, being nearly twice the size of plants on fresh water”
t0“Spergularia marina”
Claim · model-written summary
Adding 1 mM NaCl accounted for 54% of the growth stimulation over fresh water.
- Taxon
- Spergularia marinaSpergularia marinat0
- Treatment
- 1 mM NaCl supplementatione0
- Outcome
- growth stimulatione0
- Direction
- stimulatione0
- Value
- 54%e0
- Comparator
- fresh watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the major part of the growth stimulation (54%) resulted from a 1 mM NaCl supplementation of "fresh water."”
t0“Spergularia marina”
Claim · model-written summary
Root length was proportional to weight and leaf surface area.
- Taxon
- Spergularia marinaSpergularia marinat0
- Organ / stage
- roote0
- Outcome
- root lengthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root length was directly proportional to weight as was leaf surface area”
t0“Spergularia marina”
Claim · model-written summary
Salinity did not affect root length or leaf surface area relationships.
- Taxon
- Spergularia marinaSpergularia marinat0
- Treatment
- salinitye0
- Outcome
- root lengthe0
- Direction
- neither was affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root length was directly proportional to weight as was leaf surface area and neither was affected by salinity”
t0“Spergularia marina”
Claim · model-written summary
Total Na + plus K + per gram root or shoot varied little across salinity levels.
- Taxon
- Spergularia marinaSpergularia marinat0
- Outcome
- Total Na + plus K + per gram root or shoote0
- Direction
- little variatione0
- Qualifier
- 1 to 180 mM Na + levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total Na + plus K + per gram root or shoot showed little variation with salinity from 1 to 180 mM Na + levels”
t0“Spergularia marina”
Claim · model-written summary
Root relative Na + and K + contents were little affected by salinity.
- Taxon
- Spergularia marinaSpergularia marinat0
- Organ / stage
- rootse0
- Outcome
- relative Na + and K + contentse0
- Direction
- little affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In roots, the relative Na + and K + contents were also little affected by salinity”
t0“Spergularia marina”
Claim · model-written summary
Increasing salinity raised shoot Na + content.
- Taxon
- Spergularia marinaSpergularia marinat0
- Organ / stage
- shootse0
- Treatment
- increasing salinitye0
- Outcome
- Na +e0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the shoots, increasing salinity resulted in higher Na + and lower K + contents”
t0“Spergularia marina”
Claim · model-written summary
Increasing salinity lowered shoot K + content.
- Taxon
- Spergularia marinaSpergularia marinat0
- Organ / stage
- shootse0
- Treatment
- increasing salinitye0
- Outcome
- K + contentse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the shoots, increasing salinity resulted in higher Na + and lower K + contents”
t0“Spergularia marina”
Claim · model-written summary
Shoots of 0.2 × seawater plants had no regions free of or exceptionally high in Na +.
- Taxon
- Spergularia marinaSpergularia marinat0
- Organ / stage
- shootse0
- Outcome
- no regions either free of or exceptionally high in Na +e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Distribution within the shoots of 0.2 × plants showed no regions either free of or exceptionally high in Na +”
t0“Spergularia marina”
The same questions in other papers
sodium chloride · growth · Spergularia marina (salt sandspurry)Positive and negative results
2 in the opposite direction
- 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.