Abstract
Abstract Young, amphistomatous hybrid poplar ( Populus deltoides x trichocarpa ) plants were exposed daily to either background (0.025 cm 3 m ‐3 ) or elevated (0.125 cm 3 m ‐3 ) concentrations of O 3 . Levels of abaxial and adaxial leaf conductance were affected interactively by pollutant treatment, leaf age, and photon fluence rate. Consequently, conductance in O 3 ‐treated leaves was sometimes higher and sometimes lower than in comparable control leaves, depending on leaf age or level of photon fluence rate. For example, at low photon fluence rate or in the dark, conductance was greater in O 3 ‐treated than in control plants, while at high photon fluence rate that relationship was reversed. Exposure to O 3 also reduced the water‐use efficiency and range of leaf conductance of individual leaves, and altered the relationship between the conductances of the two leaf surfaces (the ratio of abaxial to adaxial leaf conductance was increased). Furthermore, O 3 treatment resulted in diminished stomatal control of water loss; excised O 3 ‐treated leaves had higher conductances and wilted sooner than excised control leaves of identical ages. Overall, the data indicate that exposure to O 3 resulted in impaired stomatal function.
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Claims 8
Claim · model-written summary
Ozone effects on abaxial and adaxial leaf conductance depended on leaf age and photon fluence rate.
- Treatment
- pollutant treatmente0
- Outcome
- abaxial and adaxial leaf conductancee0
- Qualifier
- leaf age, and photon fluence ratee0
PopulusNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of abaxial and adaxial leaf conductance were affected interactively by pollutant treatment, leaf age, and photon fluence rate”
e1“hybrid poplar”
Claim · model-written summary
At low light or in darkness, ozone-treated poplar had greater conductance than controls.
- Treatment
- O 3 ‐treatede0
- Outcome
- conductancee0
- Direction
- greatere0
- Qualifier
- at low photon fluence rate or in the darke0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at low photon fluence rate or in the dark, conductance was greater in O 3 ‐treated than in control plants”
e1“hybrid poplar”
Claim · model-written summary
At high light, ozone-treated poplar had lower conductance than controls.
- Treatment
- O 3 ‐treatede1
- Outcome
- conductancee1
- Direction
- reversede0
- Qualifier
- high photon fluence ratee0
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while at high photon fluence rate that relationship was reversed”
e1“conductance was greater in O 3 ‐treated than in control plants”
e2“hybrid poplar”
Claim · model-written summary
Ozone exposure reduced leaf water-use efficiency.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to O 3 also reduced the water‐use efficiency and range of leaf conductance of individual leaves”
e1“hybrid poplar”
Claim · model-written summary
Ozone exposure reduced the range of conductance of individual leaves.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to O 3 also reduced the water‐use efficiency and range of leaf conductance of individual leaves”
e1“hybrid poplar”
Claim · model-written summary
Ozone exposure increased the ratio of abaxial to adaxial leaf conductance.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ratio of abaxial to adaxial leaf conductance was increased”
e1“Exposure to O 3”
e2“hybrid poplar”
Claim · model-written summary
Excised ozone-treated leaves had higher conductance than same-age controls.
- Treatment
- O 3 ‐treatede0
- Outcome
- conductancese0
- Direction
- highere0
- Qualifier
- excisede0
- Comparator
- excised control leaves of identical agese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excised O 3 ‐treated leaves had higher conductances and wilted sooner than excised control leaves of identical ages”
e1“hybrid poplar”
Claim · model-written summary
Excised ozone-treated leaves wilted sooner than same-age controls.
- Treatment
- O 3 ‐treatede0
- Outcome
- wiltede0
- Direction
- soonere0
- Comparator
- excised control leaves of identical agese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excised O 3 ‐treated leaves had higher conductances and wilted sooner than excised control leaves of identical ages”
e1“hybrid poplar”
The same questions in other papers
ozone · physiology: water · Populus (poplar)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- 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.