Abstract
Abstract An ozone‐sensitive (NC‐S) and an ozone‐resistant (NC‐R) clone of white clover ( Trifolium repens L.) were tested to determine the feasibility of using them to indicate concentrations of tropospheric ozone (O 3 ) and potential effects of O 3 on plants. Plants of each clone were exposed daily in open‐top field chambers to O 3 concentrations ranging from 0.5 to 1.5 times the ambient concentrations for three summer seasons near Raleigh, NC. Foliar injury, foliar chlorophyll, and forage production of both clones were related directly to the O 3 concentration. Ozone routinely injured leaves, suppressed foliar chlorophyll, and decreased growth of NC‐S more than that of NC‐R. Forage production was highly variable over a wide range of weather conditions, but the relative forage production rate of both clones under such conditions was similar and the seasonal O 3 response relationship between NC‐S and NC‐R was relatively stable. The level of response of NC‐S to O 3 routinely increased from growth period to growth period suggesting an effect of previous exposure. More work is needed to calibrate the system over a wider range of ambient O 3 levels and climatic conditions.
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Claims 9
Claim · model-written summary
Foliar injury, chlorophyll, and forage production of both white clover clones were related to ozone concentration.
- Taxon
- White Clover
Trifolium repenst0 - Treatment
- O 3 concentratione0
- Outcome
- Foliar injury, foliar chlorophyll, and forage productione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“Foliar injury, foliar chlorophyll, and forage production of both clones were related directly to the O 3 concentration.”
Claim · model-written summary
Ozone injured leaves of NC‐S more than NC‐R.
- Taxon
- White CloverTrifolium repenst0
- Material
- NC‐Se0
- Treatment
- Ozonee0
- Outcome
- injured leavese0
- Direction
- more thane0
- Comparator
- NC‐Re0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“Ozone routinely injured leaves, suppressed foliar chlorophyll, and decreased growth of NC‐S more than that of NC‐R.”
Claim · model-written summary
Ozone suppressed foliar chlorophyll of NC‐S more than NC‐R.
- Taxon
- White CloverTrifolium repenst0
- Material
- NC‐Se0
- Treatment
- Ozonee0
- Outcome
- foliar chlorophylle0
- Direction
- suppressede0
- Comparator
- NC‐Re0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“Ozone routinely injured leaves, suppressed foliar chlorophyll, and decreased growth of NC‐S more than that of NC‐R.”
Claim · model-written summary
Ozone decreased growth of NC‐S more than NC‐R.
- Taxon
- White CloverTrifolium repenst0
- Material
- NC‐Se0
- Treatment
- Ozonee0
- Outcome
- growthe0
- Direction
- decreasede0
- Comparator
- NC‐Re0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“Ozone routinely injured leaves, suppressed foliar chlorophyll, and decreased growth of NC‐S more than that of NC‐R.”
Claim · model-written summary
Forage production varied widely across weather conditions.
- Taxon
- White CloverTrifolium repenst0
- Outcome
- Forage productione0
- Qualifier
- highly variable over a wide range of weather conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“Forage production was highly variable over a wide range of weather conditions”
Claim · model-written summary
The two clones had similar relative forage production rates under variable weather.
- Taxon
- White CloverTrifolium repenst0
- Outcome
- relative forage production ratee0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“the relative forage production rate of both clones under such conditions was similar”
Claim · model-written summary
The seasonal ozone response relation between NC‐S and NC‐R was relatively stable.
- Taxon
- White CloverTrifolium repenst0
- Material
- NC‐Se0
- Outcome
- seasonal O 3 response relationshipe0
- Direction
- relatively stablee0
- Comparator
- NC‐Re0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“the seasonal O 3 response relationship between NC‐S and NC‐R was relatively stable”
Claim · model-written summary
NC‐S ozone response increased from one growth period to the next.
- Taxon
- White CloverTrifolium repenst0
- Material
- NC‐Se0
- Treatment
- O 3e0
- Outcome
- level of responsee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“The level of response of NC‐S to O 3 routinely increased from growth period to growth period”
Claim · model-written summary
The authors call for calibration across a wider range of ozone and climate conditions.
- Taxon
- White CloverTrifolium repenst0
- Outcome
- calibrate the system over a wider range of ambient O 3 levels and climatic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“White Clover”
e0“More work is needed to calibrate the system over a wider range of ambient O 3 levels and climatic conditions.”
The same questions in other papers
ozone · physiology: pigments · Trifolium repens (white clover)Results agree
2 papers in the same direction as this paper
- negative
- negative
ozone · crop injury · Trifolium repens (white clover)Results agree
2 papers in the same direction as this paper
- negative
- negative
ozone · growth · Trifolium repens (white clover)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
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.