Abstract
Abstract The interaction between salinity and nitrogen (N) forms and concentration was studied with alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions. Salinity (0–100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area, while transpiration rate was least affected. Salinity effects were considerably moderated by additional N supply, varied with form, concentration, and stage of plant growth. The photosynthesis was reduced more in ammonium‐ than in nitrate‐fed plants, while the transpiration rate was relatively lower in nitrate‐fed plants grown either with or without NaCl. The plants also responded differently to salinity and N levels at two harvests. This indicated a change in plant behaviour with age. The promotive effect of N on photosynthesis and other parameters in saline as well as in non‐saline conditions may be attributed to the enhanced synthesis and availability of carbon assimilatory enzymes and cofactors required for optimal photosynthesis.
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
Salinity substantially reduced carbon assimilation rate.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- Salinity (0–100 mM NaCl)e1
- Outcome
- carbon assimilation ratee1
- Direction
- substantial reductione1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“Salinity (0–100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area”
Claim · model-written summary
Salinity substantially reduced stomatal conductance.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Salinity (0–100 mM NaCl)e1
- Outcome
- stomatal conductancee1
- Direction
- substantial reductione1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“Salinity (0–100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area”
Claim · model-written summary
Salinity substantially reduced water use efficiency.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Salinity (0–100 mM NaCl)e1
- Outcome
- water use efficiencye1
- Direction
- substantial reductione1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“Salinity (0–100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area”
Claim · model-written summary
Salinity substantially reduced leaf area.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Salinity (0–100 mM NaCl)e1
- Outcome
- leaf areae1
- Direction
- substantial reductione1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“Salinity (0–100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area”
Claim · model-written summary
Transpiration rate was least affected by salinity.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Salinity (0–100 mM NaCl)e1
- Outcome
- transpiration ratee1
- Direction
- least affectede1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“Salinity (0–100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area, while transpiration rate was least affected.”
Claim · model-written summary
Additional nitrogen supply moderated salinity effects.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- additional N supplye1
- Outcome
- Salinity effectse1
- Direction
- considerably moderatede1
- Qualifier
- varied with form, concentration, and stage of plant growthe1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“Salinity effects were considerably moderated by additional N supply, varied with form, concentration, and stage of plant growth.”
Claim · model-written summary
Ammonium-fed plants had a greater photosynthesis reduction than nitrate-fed plants.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- ammonium‐e1
- Outcome
- photosynthesise1
- Direction
- reduced moree1
- Comparator
- nitrate‐fed plantse1
- Setting
- greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“The photosynthesis was reduced more in ammonium‐ than in nitrate‐fed plants”
Claim · model-written summary
Nitrate-fed plants had relatively lower transpiration than ammonium-fed plants with or without NaCl.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- nitrate‐fed plantse1
- Outcome
- transpiration ratee1
- Direction
- relatively lowere1
- Qualifier
- either with or without NaCle1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“the transpiration rate was relatively lower in nitrate‐fed plants grown either with or without NaCl”
Claim · model-written summary
Responses to salinity and nitrogen differed between two harvests.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- salinity and N levelse1
- Outcome
- responded differentlye1
- Qualifier
- at two harvestse1
- Setting
- greenhouse conditionse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“The plants also responded differently to salinity and N levels at two harvests.”
Claim · model-written summary
Nitrogen promoted photosynthesis and other parameters under saline and nonsaline conditions.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Ne1
- Outcome
- photosynthesis and other parameterse1
- Direction
- promotive effecte1
- Qualifier
- in saline as well as in non‐saline conditionse1
- Setting
- greenhouse conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“The promotive effect of N on photosynthesis and other parameters in saline as well as in non‐saline conditions”
Claim · model-written summary
The authors attributed the nitrogen promotion to greater carbon assimilatory enzyme and cofactor availability.
- Taxon
- alfalfaMedicago sativae0
- Outcome
- optimal photosynthesise1
- Qualifier
- enhanced synthesis and availability of carbon assimilatory enzymes and cofactorse1
- Setting
- greenhouse conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions”
e1“may be attributed to the enhanced synthesis and availability of carbon assimilatory enzymes and cofactors required for optimal photosynthesis.”
The same questions in other papers
sodium chloride · growth · Medicago sativa (alfalfa)Results differ
38 papers in the same direction as this paper · 4 in the opposite direction
- negative
- positive
- positive
39 papers more in this group
See all 43 papers →sodium chloride · physiology: photosynthesis · Medicago sativa (alfalfa)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- negative
4 papers more in this group
See all 8 papers →sodium chloride · physiology: gas exchange · Medicago sativa (alfalfa)Results agree
1 paper in the same direction as this paper
- negative
sodium chloride · physiology: water · Medicago sativa (alfalfa)Results agree
1 paper in the same direction as this paper
- negative
salinity · physiology: photosynthesis · Medicago sativa (alfalfa)Results differ
15 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
13 papers more in this group
See all 17 papers →salinity · physiology: water · Medicago sativa (alfalfa)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
6 papers more in this group
See all 10 papers →salinity · growth · Medicago sativa (alfalfa)Positive and negative results
75 papers in the same direction as this paper · 19 in the opposite direction
- negative
- positive
- positive
91 papers more in this group
See all 95 papers →salinity · physiology: gas exchange · Medicago sativa (alfalfa)Results agree
1 paper in the same direction as this paper
- negative
8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.