Abstract
Abstract The effects of the interaction between salinity, nitrogen (N) forms and concentration were studied with alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions. Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length. Additional N considerably moderated the salinity effects on these parameters. The promotive effect of nitrate‐N was more pronounced on shoot and root dry weight and root lengths while number of root tips relatively increased more by ammonium‐N on all salinity levels. Moreover, salinity affected root length per plant relatively more than number of root tips per plant. The plants were relatively tolerant at the second harvest to salinity and N levels. It is suggested that exogenous supply of N as nitrate would improve the vegetative growth of alfalfa by moderating the suppression by salinity effects. This was also observed that during vegetative growth, alfalfa plants do not require excessive N for further shoot regrowth. It was inferred that the extent of moderation of salinity effects depends on N forms, concentration and growth stages. Notes Address for reprints: Dr. M. G. Khan, Department of Botany, Barilly College, P.O. Box 6, Bareilly, India 243 005.
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Claims 14
Claim · model-written summary
Increased salinity reduced dry weight of roots and shoots in alfalfa.
- Taxon
- alfalfa
Medicago sativae1 - Treatment
- Increased salinity (0–100 mM NaCl)e0
- Outcome
- dry weight of roots and shootse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length.”
Claim · model-written summary
Increased salinity reduced relative growth rate (RGR) of the plant in alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Increased salinity (0–100 mM NaCl)e0
- Outcome
- relative growth rate (RGR) of the plante0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length.”
Claim · model-written summary
Increased salinity reduced relative multiplication rate of root in alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Increased salinity (0–100 mM NaCl)e0
- Outcome
- relative multiplication rate of roote0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length.”
Claim · model-written summary
Increased salinity reduced mean extension rate of root in alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Increased salinity (0–100 mM NaCl)e0
- Outcome
- mean extension rate of roote0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length.”
Claim · model-written summary
Increased salinity reduced number of root branches in alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Increased salinity (0–100 mM NaCl)e0
- Outcome
- number of root branchese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length.”
Claim · model-written summary
Increased salinity reduced root length in alfalfa.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Increased salinity (0–100 mM NaCl)e0
- Outcome
- root lengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Increased salinity (0–100 mM NaCl) substantialy reduced the dry weight of roots and shoots, relative growth rate (RGR) of the plant, relative multiplication rate of root, mean extension rate of root, number of root branches, and root length.”
Claim · model-written summary
Additional nitrogen moderated the salinity effects on alfalfa growth and roots.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Additional Ne0
- Outcome
- salinity effects on these parameterse0
- Direction
- moderatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Additional N considerably moderated the salinity effects on these parameters.”
Claim · model-written summary
Nitrate nitrogen promoted shoot and root dry weight and root lengths more than ammonium nitrogen.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- nitrate‐Ne0
- Outcome
- shoot and root dry weight and root lengthse0
- Direction
- more pronouncede0
- Comparator
- ammonium‐Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“The promotive effect of nitrate‐N was more pronounced on shoot and root dry weight and root lengths while number of root tips relatively increased more by ammonium‐N on all salinity levels.”
Claim · model-written summary
Ammonium nitrogen increased root tip number more than nitrate nitrogen at all salinity levels.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- ammonium‐Ne0
- Outcome
- number of root tipse0
- Direction
- increased moree0
- Qualifier
- all salinity levelse0
- Comparator
- nitrate‐Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“The promotive effect of nitrate‐N was more pronounced on shoot and root dry weight and root lengths while number of root tips relatively increased more by ammonium‐N on all salinity levels.”
Claim · model-written summary
Salinity affected root length more than root tip number per alfalfa plant.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- salinitye0
- Outcome
- root length per plante0
- Direction
- relatively moree0
- Comparator
- number of root tips per plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“Moreover, salinity affected root length per plant relatively more than number of root tips per plant.”
Claim · model-written summary
Alfalfa plants at the second harvest were relatively tolerant of salinity and nitrogen levels.
- Taxon
- alfalfaMedicago sativae1
- Organ / stage
- second harveste0
- Outcome
- relatively tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“The plants were relatively tolerant at the second harvest to salinity and N levels.”
Claim · model-written summary
The authors suggest nitrate supply to improve alfalfa vegetative growth under salinity.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- exogenous supply of N as nitratee0
- Outcome
- exogenous supply of N as nitrate would improve the vegetative growth of alfalfae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that exogenous supply of N as nitrate would improve the vegetative growth of alfalfa by moderating the suppression by salinity effects.”
Claim · model-written summary
Alfalfa plants did not require excessive nitrogen for further shoot regrowth during vegetative growth.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- vegetative growthe0
- Outcome
- do not require excessive N for further shoot regrowthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during vegetative growth, alfalfa plants do not require excessive N for further shoot regrowth.”
Claim · model-written summary
Moderation of salinity effects depended on nitrogen form, concentration and growth stage.
- Taxon
- alfalfaMedicago sativae1
- Organ / stage
- growth stagese0
- Treatment
- N forms, concentratione0
- Outcome
- extent of moderation of salinity effectse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“alfalfa (Medicago sativa L.)”
e0“the extent of moderation of salinity effects depends on N forms, concentration and growth stages.”
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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.