Abstract
The influence of nutrient nitrate level (0-20 millimolar) on the effects of NO(2) (0-0.5 parts per million) on growth, K, photosynthetic pigment, N contents, and the activities of enzymes of N assimilation was studied in bean (Phaseolus vulgaris L. cv Kinghorn Wax) leaves. Exposing 7-day old bean seedlings for 5 days continuously to 0.02 to 0.5 parts per million NO(2) increased plant height, fresh weight, chlorophyll, carotenoid, organic N and nitrate contents, and nitrate reductase and glutamate synthase activities in the leaves of seedlings supplied with no external N. At 20 millimolar nitrate, most of the parameters examined were inhibited except for organic N and nitrate contents and glutamate synthase activity which increased in most cases. Generally, with an increase in NO(2) concentration, the stimulatory effect declined and/or the inhibitory effect increased. A 3-hour exposure of 12-day-old bean seedlings to 0.1 to 2.0 parts per million NO(2) increased nitrate content and nitrate reductase activity at each nutrient nitrate level except for a slight inhibition of enzyme activity during exposure to 2.0 parts per million NO(2) at 20 millimolar nitrate. The experiments demonstrated that the effect of NO(2) is strongly influenced by nutrient N level and that NO(2) is assimilated into organic nitrogenous compounds to serve as a source of N, only to a limited extent.
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Claims 11
Claim · model-written summary
Five days of NO(2) raised plant height and fresh weight without external N.
- Taxon
- beane0
- Treatment
- 0.02 to 0.5 parts per million NO(2)e0
- Outcome
- plant height, fresh weighte0
- Direction
- increasede0
- Qualifier
- seedlings supplied with no external Ne0
Not reportedComparator
Verbatim
e0“Exposing 7-day old bean seedlings for 5 days continuously to 0.02 to 0.5 parts per million NO(2) increased plant height, fresh weight, chlorophyll, carotenoid, organic N and nitrate contents, and nitrate reductase and glutamate synthase activities in the leaves of seedlings supplied with no external N.”
Claim · model-written summary
Five days of NO(2) raised chlorophyll and carotenoid contents without external N.
- Taxon
- beane0
- Treatment
- 0.02 to 0.5 parts per million NO(2)e0
- Outcome
- chlorophyll, carotenoide0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Exposing 7-day old bean seedlings for 5 days continuously to 0.02 to 0.5 parts per million NO(2) increased plant height, fresh weight, chlorophyll, carotenoid, organic N and nitrate contents, and nitrate reductase and glutamate synthase activities in the leaves of seedlings supplied with no external N.”
Claim · model-written summary
Five days of NO(2) raised organic N and nitrate contents without external N.
- Taxon
- beane0
- Treatment
- 0.02 to 0.5 parts per million NO(2)e0
- Outcome
- organic N and nitrate contentse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Exposing 7-day old bean seedlings for 5 days continuously to 0.02 to 0.5 parts per million NO(2) increased plant height, fresh weight, chlorophyll, carotenoid, organic N and nitrate contents, and nitrate reductase and glutamate synthase activities in the leaves of seedlings supplied with no external N.”
Claim · model-written summary
Five days of NO(2) raised nitrate reductase and glutamate synthase activities without external N.
- Taxon
- beane0
- Treatment
- 0.02 to 0.5 parts per million NO(2)e0
- Outcome
- nitrate reductase and glutamate synthase activitiese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Exposing 7-day old bean seedlings for 5 days continuously to 0.02 to 0.5 parts per million NO(2) increased plant height, fresh weight, chlorophyll, carotenoid, organic N and nitrate contents, and nitrate reductase and glutamate synthase activities in the leaves of seedlings supplied with no external N.”
Claim · model-written summary
At 20 millimolar nitrate, NO(2) inhibited most examined growth and physiological parameters.
- Taxon
- beane1
- Treatment
- 20 millimolar nitratee0
- Outcome
- most of the parameters examinede0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“At 20 millimolar nitrate, most of the parameters examined were inhibited except for organic N and nitrate contents and glutamate synthase activity which increased in most cases.”
e1“bean (Phaseolus vulgaris L. cv Kinghorn Wax)”
Claim · model-written summary
At 20 millimolar nitrate, organic N and nitrate contents and glutamate synthase activity increased in most cases.
- Taxon
- beane1
- Treatment
- 20 millimolar nitratee0
- Outcome
- organic N and nitrate contents and glutamate synthase activitye0
- Direction
- increasede0
- Qualifier
- in most casese0
Not reportedComparator
Verbatim
e0“At 20 millimolar nitrate, most of the parameters examined were inhibited except for organic N and nitrate contents and glutamate synthase activity which increased in most cases.”
e1“bean (Phaseolus vulgaris L. cv Kinghorn Wax)”
Claim · model-written summary
Increasing NO(2) concentration weakened stimulation or strengthened inhibition.
Verbatim
e0“Generally, with an increase in NO(2) concentration, the stimulatory effect declined and/or the inhibitory effect increased.”
e1“bean (Phaseolus vulgaris L. cv Kinghorn Wax)”
Claim · model-written summary
Three hours of NO(2) exposure increased nitrate content across nitrate levels.
- Taxon
- beane0
- Treatment
- 0.1 to 2.0 parts per million NO(2)e0
- Outcome
- nitrate contente0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“A 3-hour exposure of 12-day-old bean seedlings to 0.1 to 2.0 parts per million NO(2) increased nitrate content and nitrate reductase activity at each nutrient nitrate level except for a slight inhibition of enzyme activity during exposure to 2.0 parts per million NO(2) at 20 millimolar nitrate.”
Claim · model-written summary
Three hours of NO(2) exposure increased nitrate reductase activity except at the highest stated NO(2) and nitrate combination.
- Taxon
- beane0
- Treatment
- 0.1 to 2.0 parts per million NO(2)e0
- Outcome
- nitrate reductase activitye0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“A 3-hour exposure of 12-day-old bean seedlings to 0.1 to 2.0 parts per million NO(2) increased nitrate content and nitrate reductase activity at each nutrient nitrate level except for a slight inhibition of enzyme activity during exposure to 2.0 parts per million NO(2) at 20 millimolar nitrate.”
Claim · model-written summary
At 20 millimolar nitrate, 2.0 parts per million NO(2) slightly inhibited enzyme activity.
Not reportedComparator
Verbatim
e0“a slight inhibition of enzyme activity during exposure to 2.0 parts per million NO(2) at 20 millimolar nitrate”
e1“old bean seedlings for 5 days continuously”
Claim · model-written summary
NO(2) was assimilated into organic nitrogenous compounds as an N source only to a limited extent.
Verbatim
e0“NO(2) is assimilated into organic nitrogenous compounds to serve as a source of N, only to a limited extent.”
e1“bean (Phaseolus vulgaris L. cv Kinghorn Wax)”
The same questions in other papers
nitrogen · physiology: enzyme activity · Phaseolus vulgaris (common bean)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
3 papers more in this group
See all 7 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.