Abstract
This investigation was carried out in order to elucidate the mechanisms involved in the sensitivity of plants to nitrogen dioxide (NO2) . Kidney bean, cucumber, tomato, egg-plant and spinach were used as experimental plants in this study.Application of OED (oxyethylene decasanol) solution to leaves of kidney beans showed a remarkable effect to reduce the damage by NO2, especially when it was applied to the lower surface of the leaf. Leaves exposed to NO2 in the dark were severely damaged and their nitrite content was very high, while that of leaves exposed in the light was negligible. Application of NaNO2 solution onto leaves caused damage very similar to the damage by gaseous NO2. When plants were treated with 10-4-10-3 mol of DCMU (3- (3, 4-dichlorophenyl) -1, 1-dimethylurea), an inhibitor of Hill reaction, they were markedly injured by NO2 even in the light. It was found that DCMU-treated leaves contained much more nitrite than untreated ones. When plants grown in the media with sufficient nitrate nitrogen were exposed to NO2, their leaves contained less amount of nitrite and showed less sensitivity to the gas.From these results, it is suggested that the plant damage by NO2 is caused by nitrite ions and that the sensitivity of plants to NO2 is related both to the amount of NO2 taken in through stomata, and to the physiological activities of plants to reduce nitrite ions. The present results lend support to conclude that the effect of light to lessen the damage by NO2 is associated with the photochemical reduction of NO2 by nitrite reductase in the chloroplasts.
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Claims 11
Claim · model-written summary
OED applied to kidney bean leaves reduced NO2 damage, especially on the lower leaf surface.
- Taxon
- kidney beans
Phaseolus vulgarise0 - Organ / stage
- leavese0
- Treatment
- OED (oxyethylene decasanol) solutione0
- Outcome
- damage by NO2e0
- Direction
- reducee0
- Qualifier
- lower surface of the leafe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of OED (oxyethylene decasanol) solution to leaves of kidney beans showed a remarkable effect to reduce the damage by NO2, especially when it was applied to the lower surface of the leaf.”
Claim · model-written summary
Leaves exposed to NO2 in darkness were severely damaged relative to light exposure.
- Organ / stage
- Leavese0
- Treatment
- NO2 in the darke0
- Outcome
- Leaves exposed to NO2 in the dark were severely damagede0
- Direction
- severely damagede0
- Comparator
- leaves exposed in the lighte0
Not reportedTaxon
Verbatim
e0“Leaves exposed to NO2 in the dark were severely damaged and their nitrite content was very high, while that of leaves exposed in the light was negligible.”
Claim · model-written summary
Dark-exposed leaves had very high nitrite content while light-exposed leaves had negligible content.
- Organ / stage
- Leavese0
- Treatment
- NO2 in the darke0
- Outcome
- nitrite contente0
- Direction
- very highe0
- Comparator
- leaves exposed in the lighte0
Not reportedTaxon
Verbatim
e0“Leaves exposed to NO2 in the dark were severely damaged and their nitrite content was very high, while that of leaves exposed in the light was negligible.”
Claim · model-written summary
NaNO2 applied to leaves caused damage resembling gaseous NO2 injury.
- Organ / stage
- leavese0
- Treatment
- NaNO2 solutione0
- Outcome
- damagee0
- Direction
- very similare0
- Comparator
- gaseous NO2e0
Not reportedTaxon
Verbatim
e0“Application of NaNO2 solution onto leaves caused damage very similar to the damage by gaseous NO2.”
Claim · model-written summary
DCMU-treated plants were markedly injured by NO2 even in light.
- Taxon
- plantsViridiplantaee0
- Treatment
- 10-4-10-3 mol of DCMUe0
- Outcome
- injured by NO2e0
- Direction
- markedly injurede0
- Qualifier
- even in the lighte0
Not reportedComparator
Verbatim
e0“When plants were treated with 10-4-10-3 mol of DCMU (3- (3, 4-dichlorophenyl) -1, 1-dimethylurea), an inhibitor of Hill reaction, they were markedly injured by NO2 even in the light.”
Claim · model-written summary
DCMU-treated leaves contained more nitrite than untreated leaves.
- Organ / stage
- leavese0
- Treatment
- DCMU-treatede0
- Outcome
- nitritee0
- Direction
- much moree0
- Comparator
- untreated onese0
Not reportedTaxon
Verbatim
e0“DCMU-treated leaves contained much more nitrite than untreated ones.”
Claim · model-written summary
Plants grown with sufficient nitrate nitrogen had less leaf nitrite after NO2 exposure.
- Taxon
- plantsViridiplantaee0
- Organ / stage
- leavese0
- Treatment
- sufficient nitrate nitrogene0
- Outcome
- nitritee0
- Direction
- lesse0
Not reportedComparator
Verbatim
e0“When plants grown in the media with sufficient nitrate nitrogen were exposed to NO2, their leaves contained less amount of nitrite and showed less sensitivity to the gas.”
Claim · model-written summary
Plants grown with sufficient nitrate nitrogen showed less sensitivity to NO2.
- Taxon
- plantsViridiplantaee0
- Treatment
- sufficient nitrate nitrogene0
- Outcome
- sensitivity to the gase0
- Direction
- lesse0
Not reportedComparator
Verbatim
e0“When plants grown in the media with sufficient nitrate nitrogen were exposed to NO2, their leaves contained less amount of nitrite and showed less sensitivity to the gas.”
Claim · model-written summary
The authors attribute NO2 plant damage to nitrite ions.
Verbatim
e0“the plant damage by NO2 is caused by nitrite ions”
Claim · model-written summary
The authors relate NO2 sensitivity to NO2 uptake through stomata and physiological nitrite reduction.
- Taxon
- plantsViridiplantaee0
- Outcome
- sensitivity of plants to NO2e0
- Qualifier
- physiological activities of plants to reduce nitrite ionse0
Verbatim
e0“the sensitivity of plants to NO2 is related both to the amount of NO2 taken in through stomata, and to the physiological activities of plants to reduce nitrite ions”
Claim · model-written summary
The authors associate light-mediated reduction in NO2 damage with photochemical NO2 reduction by chloroplast nitrite reductase.
Not reportedTaxon
Verbatim
e0“the effect of light to lessen the damage by NO2 is associated with the photochemical reduction of NO2 by nitrite reductase in the chloroplasts”
The same questions in other papers
nitrogen · molecular: metabolites · Viridiplantae (plants)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- negative
- no effect
2 papers more in this group
See all 6 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.