Abstract
Using ozone treatments in OTCs(open top chambers),the effect of increase atmospheric surface level ozone(O3) contents on antioxidant enzymes activities of winter wheat leaves(Triticum aestivum)was investigated,in the growing/development(G/D) periods including reviving,jointing,booting,heading,filing and mature stages.Two experiments were performed in two years by doing each experiment in one year,using six OTCs in each.The chambers were equivalent,but two were fed with air while the other four with ozone at different concentration,in that two chambers with 100nL/L and the other two with 150nL/L.Winter wheat were grown to all life stage in OTCs.From reviving to mature stages,the plants were treated for 8 h(8:00-16:00) in every sunny day with different dose of O3,respectively.The activities of winter wheat leaves(the second and the 5th from the top).Catalase(CAT),peroxidase(POD),superoxide dismutase(SOD) and ascorbate peroxidase(APX) were measured.Antioxidant enzymes of each treatment was assayed in triplicate.The data were initially compared by analysis of variance and differences between means were detected using the Duncans Multiple Range Tests.Values of P0.05 indicated significance.Quite similar results were obtained during two years′ experiments,suggesting that as a G/D stage is progressing,the activities of leaves catalase(CAT) and peroxidase(POD) increased firstly but consequently declined.Under the increased O3 stress,CAT and POD activities raised and their peak values appeared earlier,but POD needed higher O3 concentration than CAT′s,The activeness of CAT and POD is induced in the later G/D period.Subjected to low concentration of O3,POD activity was found to remain unaffected in longer time compared to CAT.When the O3 concentration was increased to 150 nL/L,the relationship of superoxide dismutase(SOD) activities against wheat growth stages was altered from double hump to single hump style.SOD activity was found to be obviously decreased in the advance G/D period under higher O3 stress.No obvious influence was found for the time response of ascorbate peroxidase caused by O3 stress,but in a certainly range,while O3 concentration could induce APX activity.The effects and influenced strength are significantly different between superoxide dismutase and ascorbate peroxidase against O3 doses.CAT and POD are more sensitive to O3 than SOD and APX.Taking together,the elevated O3 concentration in atmospheric surface layer,impinges on the time series features of CAT,POD and SOD.O3 stresses could induce oxidative stress.Antioxidant enzymes activities were upregulated under low concentration and short time ozone fumigation.Otherwise,enhance O3 irradiation and prolong fumigation time the activities of antioxidant enzymes were inhibited.The effects on antioxidant enzymes activities are relate to(G/D) periods of winter wheat,dose of O3 and the exposure time.Various antioxidant enzymes have different O3-sensitive,representing that the threshold of subjected to O3,the responses time to O3 stress and the variation scope of antioxidant enzymes activities are different.
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Claims 12
Claim · model-written summary
Leaf CAT and POD activities initially increased and then declined as growth and development progressed.
- Taxon
- Triticum aestivum
Triticum aestivume1 - Organ / stage
- leavese0
- Gene
- catalase(CAT) and peroxidase(POD)e0
- Outcome
- activitiese0
- Direction
- increased firstly but consequently declinede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as a G/D stage is progressing,the activities of leaves catalase(CAT) and peroxidase(POD) increased firstly but consequently declined.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Higher ozone stress raised CAT activity and brought its peak earlier.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- increased O3 stresse0
- Gene
- CATe0
- Outcome
- CAT and POD activitiese0
- Direction
- raisede0
- Qualifier
- peak values appeared earliere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the increased O3 stress,CAT and POD activities raised and their peak values appeared earlier”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
POD required a higher ozone concentration than CAT.
- Taxon
- Triticum aestivumTriticum aestivume1
- Gene
- PODe0
- Outcome
- O3 concentratione0
- Direction
- highere0
- Comparator
- CATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“POD needed higher O3 concentration than CAT′s”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Low ozone left POD activity unaffected for longer than CAT.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- low concentration of O3e0
- Gene
- PODe0
- Outcome
- POD activitye0
- Direction
- remain unaffectede0
- Comparator
- CATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subjected to low concentration of O3,POD activity was found to remain unaffected in longer time compared to CAT.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
At 150 nL/L ozone, the SOD activity pattern across growth stages changed from two peaks to one.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- O3 concentration was increased to 150 nL/Le0
- Gene
- superoxide dismutase(SOD)e0
- Outcome
- relationship of superoxide dismutase(SOD) activities against wheat growth stagese0
- Comparator
- double humpe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the O3 concentration was increased to 150 nL/L,the relationship of superoxide dismutase(SOD) activities against wheat growth stages was altered from double hump to single hump style.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Higher ozone decreased SOD activity in advanced growth stages.
- Taxon
- Triticum aestivumTriticum aestivume1
- Organ / stage
- advance G/D periode0
- Treatment
- higher O3 stresse0
- Gene
- SODe0
- Outcome
- SOD activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD activity was found to be obviously decreased in the advance G/D period under higher O3 stress.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Ozone had no obvious effect on the timing of APX response.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- O3 stresse0
- Gene
- ascorbate peroxidasee0
- Outcome
- time response of ascorbate peroxidasee0
- Direction
- No obvious influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No obvious influence was found for the time response of ascorbate peroxidase caused by O3 stress”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Within a certain range, ozone concentration induced APX activity.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- O3 concentratione0
- Gene
- APXe0
- Outcome
- APX activitye0
- Direction
- inducee0
- Qualifier
- in a certainly rangee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in a certainly range,while O3 concentration could induce APX activity.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
SOD and APX responded significantly differently to ozone doses.
- Taxon
- Triticum aestivumTriticum aestivume1
- Gene
- superoxide dismutase and ascorbate peroxidasee0
- Outcome
- effects and influenced strengthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effects and influenced strength are significantly different between superoxide dismutase and ascorbate peroxidase against O3 doses.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
CAT and POD were more sensitive to ozone than SOD and APX.
- Taxon
- Triticum aestivumTriticum aestivume1
- Gene
- CAT and PODe0
- Outcome
- sensitive to O3e0
- Direction
- more sensitivee0
- Comparator
- SOD and APXe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CAT and POD are more sensitive to O3 than SOD and APX.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Low-concentration, short-duration ozone fumigation upregulated antioxidant enzyme activities.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- low concentration and short time ozone fumigatione0
- Outcome
- Antioxidant enzymes activitiese0
- Direction
- upregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Antioxidant enzymes activities were upregulated under low concentration and short time ozone fumigation.”
e1“winter wheat leaves(Triticum aestivum)”
Claim · model-written summary
Higher ozone exposure and longer fumigation inhibited antioxidant enzyme activities.
- Taxon
- Triticum aestivumTriticum aestivume1
- Treatment
- enhance O3 irradiation and prolong fumigation timee0
- Outcome
- activities of antioxidant enzymese0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhance O3 irradiation and prolong fumigation time the activities of antioxidant enzymes were inhibited.”
e1“winter wheat leaves(Triticum aestivum)”
The same questions in other papers
ozone · physiology: antioxidant enzymes · Triticum aestivum (wheat)Results differ
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- positive
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See all 15 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.