Abstract
The effects of salinity at different light intensities on fresh weight growth and on carbon dioxide influx and efflux were examined in young plants of lucerne (Medicago sativa L.) that had been grown in solution culture with nitrogen supplied either as nitrate or by a symbiotic rhizobium. Although the inoculated plants grew more slowly than those supplied with nitrate, NaCl at a level equivalent to an osmotic stress of −0.3 MPa did not reduce the growth rate of either type of plant under a 12 h day-length in a growth chamber. With a day-length of 5 h salt stress (0.0 to −0.6 MPa) did not greatly affect gross photosynthesis of plants grown on nitrate but respiration rate reached a maximum at −0.3 MPa and declined at larger salt concentrations. Salt diminished both gross and net photosynthesis in the inoculated plants at a 5 h day-length without stimulating respiration. The relationship between photosynthesis and respiration as the photon flux density was successively decreased was used to infer the effect of salt on maintenance respiration of the plants supplied with nitrate. Growth and maintenance components of respiration could not clearly be separated in the inoculated plants suggesting that these were unable to maintain themselves under the combined stresses of salt and low light intensity. This view was supported by chemical analysis of the plant material. We conclude that the failure of the inoculated plants to adapt to these conditions could be attributed to the greater demand for assimilates by the rhizobium.
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Claims 10
Claim · model-written summary
Rhizobium-inoculated lucerne grew more slowly than nitrate-supplied plants.
- Taxon
- Lucerne
Medicago sativat0 - Treatment
- symbiotic rhizobiume1
- Outcome
- plants grewe0
- Direction
- more slowlye0
- Comparator
- nitratee1
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the inoculated plants grew more slowly than those supplied with nitrate”
e1“nitrogen supplied either as nitrate or by a symbiotic rhizobium”
t0“Lucerne”
Claim · model-written summary
NaCl at −0.3 MPa did not reduce growth rate of nitrate-supplied lucerne under a 12 h day-length.
- Taxon
- LucerneMedicago sativat0
- Treatment
- NaCl at a level equivalent to an osmotic stress of −0.3 MPae0
- Outcome
- growth ratee0
- Direction
- did not reducee0
- Qualifier
- 12 h day-lengthe0
- Setting
- growth chambere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl at a level equivalent to an osmotic stress of −0.3 MPa did not reduce the growth rate of either type of plant under a 12 h day-length in a growth chamber”
t0“Lucerne”
Claim · model-written summary
NaCl at −0.3 MPa did not reduce growth rate of inoculated lucerne under a 12 h day-length.
- Taxon
- LucerneMedicago sativat0
- Treatment
- NaCl at a level equivalent to an osmotic stress of −0.3 MPae0
- Outcome
- growth ratee0
- Direction
- did not reducee0
- Qualifier
- inoculated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the inoculated plants grew more slowly than those supplied with nitrate, NaCl at a level equivalent to an osmotic stress of −0.3 MPa did not reduce the growth rate of either type of plant under a 12 h day-length in a growth chamber”
e1“a symbiotic rhizobium”
t0“Lucerne”
Claim · model-written summary
At a 5 h day-length, salt stress had little effect on gross photosynthesis of nitrate-grown lucerne.
- Taxon
- LucerneMedicago sativat0
- Treatment
- salt stress (0.0 to −0.6 MPa)e0
- Outcome
- gross photosynthesise0
- Direction
- did not greatly affecte0
- Qualifier
- day-length of 5 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With a day-length of 5 h salt stress (0.0 to −0.6 MPa) did not greatly affect gross photosynthesis of plants grown on nitrate”
t0“Lucerne”
Claim · model-written summary
At a 5 h day-length, nitrate-grown lucerne respiration peaked at −0.3 MPa and declined at higher salt concentrations.
- Taxon
- LucerneMedicago sativat0
- Treatment
- −0.3 MPae0
- Outcome
- respiration ratee0
- Direction
- reached a maximume0
- Comparator
- larger salt concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“respiration rate reached a maximum at −0.3 MPa and declined at larger salt concentrations”
t0“Lucerne”
Claim · model-written summary
At a 5 h day-length, salt reduced gross photosynthesis in inoculated lucerne.
- Taxon
- LucerneMedicago sativat0
- Treatment
- Salte0
- Outcome
- grosse0
- Direction
- diminishede0
- Qualifier
- 5 h day-lengthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt diminished both gross and net photosynthesis in the inoculated plants at a 5 h day-length without stimulating respiration.”
e1“a symbiotic rhizobium”
t0“Lucerne”
Claim · model-written summary
At a 5 h day-length, salt reduced net photosynthesis in inoculated lucerne.
- Taxon
- LucerneMedicago sativat0
- Treatment
- Salte0
- Outcome
- net photosynthesise0
- Direction
- diminishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt diminished both gross and net photosynthesis in the inoculated plants at a 5 h day-length without stimulating respiration.”
e1“a symbiotic rhizobium”
t0“Lucerne”
Claim · model-written summary
At a 5 h day-length, salt did not stimulate respiration in inoculated lucerne.
- Taxon
- LucerneMedicago sativat0
- Treatment
- Salte0
- Outcome
- respiratione0
- Direction
- without stimulatinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt diminished both gross and net photosynthesis in the inoculated plants at a 5 h day-length without stimulating respiration.”
e1“a symbiotic rhizobium”
t0“Lucerne”
Claim · model-written summary
Growth and maintenance respiration components could not clearly be separated in inoculated lucerne.
- Taxon
- LucerneMedicago sativat0
- Outcome
- Growth and maintenance components of respiration could not clearly be separatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth and maintenance components of respiration could not clearly be separated in the inoculated plants”
e1“a symbiotic rhizobium”
t0“Lucerne”
Claim · model-written summary
The authors attribute inoculated lucerne failure to adapt to salt and low light to increased assimilate demand by rhizobium.
- Taxon
- LucerneMedicago sativat0
- Outcome
- failure of the inoculated plants to adapte0
- Qualifier
- greater demand for assimilatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“failure of the inoculated plants to adapt to these conditions could be attributed to the greater demand for assimilates by the rhizobium”
t0“Lucerne”
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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.