Abstract
The gross symptomatology of ozone injury is summarized for comparison with other disorders and as an aid to those who must attempt to diagnose foliar disorders of this species. There is great variation in sensitivity to ozone among individual white pines. Acute injuries are caused by exposure of sensitive foliage to unusually high concentrations of ozone for a few hours or less. These characteristically take the form of more or less discrete lesions including the well-known tipburn. Chronic injury is the result of daily exposure to lower concentrations of ozone, sufficient to cause some intensification of existing symptoms and presumably to reduce the photosynthetic efficiency of ozone and the stage of needle development but also upon environmental conditions during and after exposure. The most important environmental factor under prevailing field conditions appears to be the presence of free moisture on pine needles during exposure to ozone. Moisture on pine foliage enhances the effect of the toxicant.
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Claims 5
Claim · model-written summary
White pines vary greatly in ozone sensitivity.
Verbatim
e0“There is great variation in sensitivity to ozone among individual white pines.”
Claim · model-written summary
Brief exposure to unusually high ozone concentrations causes acute lesions including tipburn in sensitive foliage.
- Taxon
- eastern white pine
_-_Killarney%2C_Ontario_01.jpg?width=60)
Pinus strobust0 - Treatment
- exposure of sensitive foliage to unusually high concentrations of ozonee0
- Outcome
- discrete lesions including the well-known tipburne0
- Qualifier
- a few hours or lesse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Killarney%2C_Ontario_01.jpg?width=500)
Verbatim
e0“Acute injuries are caused by exposure of sensitive foliage to unusually high concentrations of ozone for a few hours or less. These characteristically take the form of more or less discrete lesions including the well-known tipburn.”
t0“eastern white pine”
Claim · model-written summary
Daily lower ozone exposure causes chronic injury and intensification of existing symptoms.
- Taxon
- eastern white pinePinus strobust0
- Treatment
- daily exposure to lower concentrations of ozonee0
- Outcome
- existing symptomse0
- Direction
- intensificatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chronic injury is the result of daily exposure to lower concentrations of ozone, sufficient to cause some intensification of existing symptoms”
t0“eastern white pine”
Claim · model-written summary
Free moisture on pine needles during ozone exposure appears to be the most important environmental factor under field conditions.
PinusNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most important environmental factor under prevailing field conditions appears to be the presence of free moisture on pine needles during exposure to ozone.”
Claim · model-written summary
Moisture on pine foliage enhances ozone toxicity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moisture on pine foliage enhances the effect of the toxicant.”
e1“during exposure to ozone”
The same questions in other papers
ozone · disease · Pinus strobus (Eastern white pine)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
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.