Abstract
Vacuum infiltration of nitrate and ammonium ions into nitrogen-starved leaf tissue of Themeda triandra and Zea mays increased the carbon dioxide compensation point well in excess of the level normally associated with C4 photosynthetic pathway plants. The net photosynthetic rate was stimulated by the nitrate ions and but slightly inhibited by the ammonium ions. These effects were immediate. The ions increased the Themeda triandra carbon dioxide compensation point and had no effect on that of Zea mays when these plants were grown on fertilized soil. The dark respiration rates of nitrogen-starved Themeda triandra leaves were unaffected by the infiltration of inorganic nitrogen ions. The results suggest that photosynthesis and photorespiration are directly influenced by inorganic nitrogen ions.
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Claims 10
Claim · model-written summary
Nitrate infiltration increased the carbon dioxide compensation point of nitrogen-starved Themeda triandra.
- Taxon
- Themeda triandra
Themeda triandrae1 - Treatment
- nitratee0
- Outcome
- carbon dioxide compensation pointe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuum infiltration of nitrate and ammonium ions into nitrogen-starved leaf tissue of Themeda triandra and Zea mays increased the carbon dioxide compensation point”
e1“of Themeda triandra and Zea mays”
Claim · model-written summary
Ammonium infiltration increased the carbon dioxide compensation point of nitrogen-starved Themeda triandra.
- Taxon
- Themeda triandraThemeda triandrae0
- Treatment
- ammonium ionse0
- Outcome
- carbon dioxide compensation pointe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuum infiltration of nitrate and ammonium ions into nitrogen-starved leaf tissue of Themeda triandra and Zea mays increased the carbon dioxide compensation point”
Claim · model-written summary
Nitrate infiltration increased the carbon dioxide compensation point of nitrogen-starved Zea mays.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuum infiltration of nitrate and ammonium ions into nitrogen-starved leaf tissue of Themeda triandra and Zea mays increased the carbon dioxide compensation point”
Claim · model-written summary
Ammonium infiltration increased the carbon dioxide compensation point of nitrogen-starved Zea mays.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vacuum infiltration of nitrate and ammonium ions into nitrogen-starved leaf tissue of Themeda triandra and Zea mays increased the carbon dioxide compensation point”
Claim · model-written summary
Nitrate ions stimulated net photosynthetic rate.
- Taxon
- Themeda triandra and Zea mays
Zea maysThemeda triandrae1 - Treatment
- nitrate ionse0
- Outcome
- net photosynthetic ratee0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate was stimulated by the nitrate ions”
e1“Themeda triandra and Zea mays”
Claim · model-written summary
Ammonium ions slightly inhibited net photosynthetic rate.
- Taxon
- Themeda triandra and Zea maysZea maysThemeda triandrae1
- Treatment
- ammonium ionse0
- Outcome
- net photosynthetic ratee0
- Direction
- slightly inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The net photosynthetic rate was stimulated by the nitrate ions and but slightly inhibited by the ammonium ions”
e1“Themeda triandra and Zea mays”
Claim · model-written summary
Inorganic nitrogen ions increased the compensation point of Themeda triandra grown on fertilized soil.
- Taxon
- Themeda triandraThemeda triandrae0
- Treatment
- The ionse0
- Outcome
- carbon dioxide compensation pointe0
- Direction
- increasede0
- Qualifier
- grown on fertilized soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ions increased the Themeda triandra carbon dioxide compensation point and had no effect on that of Zea mays when these plants were grown on fertilized soil.”
Claim · model-written summary
Inorganic nitrogen ions had no effect on the compensation point of Zea mays grown on fertilized soil.
- Treatment
- The ionse0
- Outcome
- carbon dioxide compensation pointe0
- Direction
- no effecte0
- Qualifier
- grown on fertilized soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ions increased the Themeda triandra carbon dioxide compensation point and had no effect on that of Zea mays when these plants were grown on fertilized soil.”
Claim · model-written summary
Inorganic nitrogen ion infiltration did not alter dark respiration rates in nitrogen-starved Themeda triandra leaves.
- Taxon
- Themeda triandraThemeda triandrae0
- Treatment
- infiltration of inorganic nitrogen ionse0
- Outcome
- dark respiration ratese0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The dark respiration rates of nitrogen-starved Themeda triandra leaves were unaffected by the infiltration of inorganic nitrogen ions.”
Claim · model-written summary
The authors infer that inorganic nitrogen ions directly influence photosynthesis and photorespiration.
- Taxon
- Themeda triandra and Zea maysZea maysThemeda triandrae1
- Treatment
- inorganic nitrogen ionse0
- Outcome
- photosynthesis and photorespiratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that photosynthesis and photorespiration are directly influenced by inorganic nitrogen ions.”
e1“Themeda triandra and Zea mays”
The same questions in other papers
ammonium · physiology: photosynthesis · Zea mays (maize)Positive and negative results
1 in the opposite direction
- positive
nitrogen · physiology: photosynthesis · Themeda triandra (kangaroo grass)Positive and negative results
1 in the opposite direction
- no effect
nitrogen · physiology: photosynthesis · Zea mays (maize)Positive and negative results
77 papers in the same direction as this paper · 18 in the opposite direction · 2 reporting no difference from an alternative
- positive
- negative
- negative
94 papers more in this group
See all 98 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.