Abstract
Abstract The Interaction between the effects of nitrate (NO3) and sodium chloride (NaCl) concentration on growth) water relations, nitrogen (N) contents and N fixation were investigated in alfalfa (Medicago sativa L. cv. Magali). The plants were grown hydroponically in a growth chamber, in the presence or absence of 3 mM potassium nitrate (KNO3) and exposed to various concentrations of NaCl. Increased salinity resulted in a significant decrease in shoot and root biomass, relative water content and water potential. Shoot growth was more inhibited by NaCl than root biomass. The plants grown in the presence of NO3 were slightly less affected by NaCl than the plants dependent on N fixation for their N nutrition. Nitrogenase activity measured by acetylene reduction activity was substantially inhibited by NaCl, and this inhibition was significantly correlated to the inhibition of shoot growth and total N contents. The comparison of the curves of ARA response to oxygen (O2) partial pressure showed that the salt‐induced inhibition of nitrogenase activity was associated with a significant increase in the critical O2 pressure of the nodules exposed to NaCl. This result shows that NaCl decreases the nodule permeability to O2 diffusion in undeterminate nodule of alfalfa, like previously shown with determinate nodules of soybean.
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Claims 11
Claim · model-written summary
Increasing salinity significantly reduced alfalfa shoot biomass.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- Increased salinitye0
- Outcome
- shoote0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salinity resulted in a significant decrease in shoot and root biomass, relative water content and water potential.”
t0“alfalfa”
Claim · model-written summary
Increasing salinity significantly reduced alfalfa root biomass.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Increased salinitye0
- Outcome
- root biomasse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salinity resulted in a significant decrease in shoot and root biomass, relative water content and water potential.”
t0“alfalfa”
Claim · model-written summary
Increasing salinity significantly reduced relative water content.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Increased salinitye0
- Outcome
- relative water contente0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salinity resulted in a significant decrease in shoot and root biomass, relative water content and water potential.”
t0“alfalfa”
Claim · model-written summary
Increasing salinity significantly reduced water potential.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Increased salinitye0
- Outcome
- water potentiale0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salinity resulted in a significant decrease in shoot and root biomass, relative water content and water potential.”
t0“alfalfa”
Claim · model-written summary
Salt inhibited shoot growth more than root biomass.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- NaCle0
- Outcome
- Shoot growthe0
- Direction
- more inhibitede0
- Comparator
- root biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot growth was more inhibited by NaCl than root biomass.”
t0“alfalfa”
Claim · model-written summary
Nitrate-fed plants were slightly less affected by salt than nitrogen-fixing plants.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- NO3e0
- Outcome
- affected by NaCle0
- Direction
- less affectede0
- Comparator
- plants dependent on N fixatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants grown in the presence of NO3 were slightly less affected by NaCl than the plants dependent on N fixation for their N nutrition.”
t0“alfalfa”
Claim · model-written summary
Salt substantially inhibited nitrogenase activity.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- NaCle0
- Outcome
- Nitrogenase activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogenase activity measured by acetylene reduction activity was substantially inhibited by NaCl”
t0“alfalfa”
Claim · model-written summary
Inhibition of nitrogenase activity was significantly correlated with inhibition of shoot growth.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- inhibition of shoot growthe0
- Comparator
- this inhibitione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this inhibition was significantly correlated to the inhibition of shoot growth and total N contents.”
t0“alfalfa”
Claim · model-written summary
Inhibition of nitrogenase activity was significantly correlated with total nitrogen contents.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- total N contentse0
- Comparator
- this inhibitione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this inhibition was significantly correlated to the inhibition of shoot growth and total N contents.”
t0“alfalfa”
Claim · model-written summary
Salt exposure significantly increased critical oxygen pressure of nodules.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- nodulese0
- Treatment
- NaCle0
- Outcome
- critical O2 pressure of the nodulese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salt‐induced inhibition of nitrogenase activity was associated with a significant increase in the critical O2 pressure of the nodules exposed to NaCl.”
t0“alfalfa”
Claim · model-written summary
Salt decreased oxygen diffusion permeability of alfalfa nodules.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- undeterminate nodulee0
- Treatment
- NaCle0
- Outcome
- nodule permeability to O2 diffusione0
- Direction
- decreasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl decreases the nodule permeability to O2 diffusion in undeterminate nodule of alfalfa”
t0“alfalfa”
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See all 95 papers →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.