Abstract
ABSTRACT The initial objective was to confirm evidence, obtained from field grown plants, for iron (Fe) accumulation in leaves under ozone exposure. Tobacco plants were grown in pots under either open air or growth chamber conditions. The ozone-sensitive cultivar Bel W3 showed symptoms of ozone injury only when grown outside, while the cultivar Virginia never developed symptoms. In both cultivars, basal leaves of plants grown outside had higher concentration of Fe, but not of manganese (Mn) or zinc (Zn), than those from the growth chamber. Results suggest an interference of the oxidative stress with the mechanisms regulating Fe homeostasis. A second objective was to test whether differences in tolerance to ozone correspond with differences in tolerance to Fe toxicity. Iron toxicity was induced by supplying an excess of Fe-EDTA to plants, grown hydroponically in a growth chamber, upon partial root cutting. Symptoms in leaves were more severe in Bel W3 than in Virginia, which suggested that mechanisms of tolerance to ozone were also effective against Fe toxicity. In both cultivars, a good correlation was determined between Fe accumulation and ethylene production in the leaves.
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Claims 7
Claim · model-written summary
Bel W3 showed ozone injury only outdoors.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Material
- Bel W3e0
- Outcome
- symptoms of ozone injurye0
- Setting
- outsidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone-sensitive cultivar Bel W3 showed symptoms of ozone injury only when grown outside”
t0“Tobacco”
Claim · model-written summary
Virginia never showed ozone injury symptoms.
- Taxon
- TobaccoNicotiana tabacumt0
- Material
- Virginiae0
- Outcome
- never developed symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivar Virginia never developed symptoms”
e1“symptoms of ozone injury”
t0“Tobacco”
Claim · model-written summary
Outdoor basal leaves had higher Fe concentration than chamber leaves in both cultivars.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- basal leavese0
- Outcome
- concentration of Fee0
- Direction
- highere0
- Comparator
- growth chambere0
- Setting
- outsidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cultivars, basal leaves of plants grown outside had higher concentration of Fe, but not of manganese (Mn) or zinc (Zn), than those from the growth chamber”
t0“Tobacco”
Claim · model-written summary
Outdoor basal leaves did not have higher Mn or Zn concentration than chamber leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- manganese (Mn) or zinc (Zn)e0
- Direction
- but note0
- Comparator
- growth chambere0
- Setting
- outsidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cultivars, basal leaves of plants grown outside had higher concentration of Fe, but not of manganese (Mn) or zinc (Zn), than those from the growth chamber”
t0“Tobacco”
Claim · model-written summary
Ozone oxidative stress may interfere with Fe homeostasis.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- Fe homeostasise0
- Qualifier
- oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results suggest an interference of the oxidative stress with the mechanisms regulating Fe homeostasis”
t0“Tobacco”
Claim · model-written summary
After excess Fe-EDTA and root cutting, Bel W3 leaf symptoms were more severe than Virginia.
- Taxon
- TobaccoNicotiana tabacumt0
- Material
- Bel W3e0
- Treatment
- an excess of Fe-EDTAe0
- Outcome
- Symptoms in leavese0
- Direction
- more severee0
- Comparator
- Virginiae0
- Setting
- growth chambere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Iron toxicity was induced by supplying an excess of Fe-EDTA to plants, grown hydroponically in a growth chamber, upon partial root cutting. Symptoms in leaves were more severe in Bel W3 than in Virginia”
t0“Tobacco”
Claim · model-written summary
Fe accumulation correlated with ethylene production in leaves of both cultivars.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- leavese0
- Compound
- ethylenee0
- Outcome
- Fe accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both cultivars, a good correlation was determined between Fe accumulation and ethylene production in the leaves”
t0“Tobacco”
The same questions in other papers
iron atom · disease · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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.