Abstract
This experiment was conducted to find out the effects of ABA and IAA on activities of antioxidant enzymes, antioxidant content, and growth of tobacco under exposure to ozone. The exposure to ozone in tobacco plant significantly decreased plant height, but it did not show any difference in vegetative characteristics except plant height of IAA M treated. Total chlorophyll content of NC 82 was dramatically decreased with increase in days after ozone treatment. However, reduction of chlorophyll was minimized when plant growth regulators were treated before ozone exposure. Three days treament of ozone in tobacco increased ascorbic acid of oxidised form, while slightly decreased `in reduced ascorbic acid by IAA treatment. But seven days of ozone treatment showed increase in ascorbic acid and decrease in dehydroascorbic acid. Ozone treatment did not show any difference in glutathione content and glutathione reductase activity when plant growth regulators were treated. Activities of superoxide dismutase(SOD), ascorbate peroxidase(AP) and guaiacol peroxidase(GP) were increased by the exposure to ozone for three days. However, there were no difference in activities of SOD, AP and GP due to exposure to ozone for seven days. These reactions may be interpreted as protective responses to prevent or alleviate the damage of tobacco plant by ozone exposure.
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Claims 11
Claim · model-written summary
Ozone significantly decreased tobacco height.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- exposure to ozonee0
- Outcome
- plant heighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The exposure to ozone in tobacco plant significantly decreased plant height”
Claim · model-written summary
Chlorophyll in NC 82 fell as days after ozone exposure increased.
- Taxon
- tobaccoNicotiana tabacume1
- Material
- NC 82e0
- Treatment
- ozone treatmente0
- Outcome
- Total chlorophyll contente0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total chlorophyll content of NC 82 was dramatically decreased with increase in days after ozone treatment”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Growth regulators before ozone minimized chlorophyll loss.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- plant growth regulatorse0
- Outcome
- reduction of chlorophylle0
- Direction
- minimizede0
- Qualifier
- before ozone exposuree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduction of chlorophyll was minimized when plant growth regulators were treated before ozone exposure”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Three days of ozone increased oxidized ascorbic acid.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Three days treament of ozonee0
- Outcome
- ascorbic acid of oxidised forme0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three days treament of ozone in tobacco increased ascorbic acid of oxidised form”
Claim · model-written summary
IAA slightly decreased reduced ascorbic acid.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- IAA treatmente0
- Outcome
- reduced ascorbic acide0
- Direction
- decreasede0
- Qualifier
- slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slightly decreased `in reduced ascorbic acid by IAA treatment”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Seven days of ozone increased ascorbic acid.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- seven days of ozone treatmente0
- Outcome
- ascorbic acide0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seven days of ozone treatment showed increase in ascorbic acid”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Seven days of ozone decreased dehydroascorbic acid.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- seven days of ozone treatmente0
- Outcome
- dehydroascorbic acide0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seven days of ozone treatment showed increase in ascorbic acid and decrease in dehydroascorbic acid”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Ozone did not change glutathione content or glutathione reductase activity under regulator treatment.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- Ozone treatmente0
- Outcome
- glutathione content and glutathione reductase activitye0
- Direction
- did not show any differencee0
- Qualifier
- when plant growth regulators were treatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ozone treatment did not show any difference in glutathione content and glutathione reductase activity when plant growth regulators were treated”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Three days of ozone increased SOD, AP and GP activities.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- exposure to ozone for three dayse0
- Outcome
- Activities of superoxide dismutase(SOD), ascorbate peroxidase(AP) and guaiacol peroxidase(GP)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Activities of superoxide dismutase(SOD), ascorbate peroxidase(AP) and guaiacol peroxidase(GP) were increased by the exposure to ozone for three days”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
Seven days of ozone showed no difference in SOD, AP and GP activities.
- Taxon
- tobaccoNicotiana tabacume1
- Treatment
- exposure to ozone for seven dayse0
- Outcome
- activities of SOD, AP and GPe0
- Direction
- no differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no difference in activities of SOD, AP and GP due to exposure to ozone for seven days”
e1“growth of tobacco under exposure to ozone”
Claim · model-written summary
The authors interpret the responses as protective against ozone injury.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- ozone exposuree0
- Outcome
- protective responsese0
- Qualifier
- may be interpretede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These reactions may be interpreted as protective responses to prevent or alleviate the damage of tobacco plant by ozone exposure”
The same questions in other papers
ozone · physiology: antioxidant enzymes · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
class · physiology: pigments · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
ozone · growth · Nicotiana tabacum (tobacco)Results agree
7 papers in the same direction as this paper
- negative
- negative
- negative
4 papers more in this group
See all 8 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.