Claim · model-written summary
At the highest ozone treatment, Clone 259 leaf area was 24% below controls by late August.
- Taxon
- aspent0
- Material
- 259e0
- Treatment
- highest O(3) treatmente0
- Outcome
- leaf areae0
- Direction
- decreasede0
- Value
- 24e0
- Comparator
- controlse0
Not reportedGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingQualifier
Verbatim
e0“By late August, leaf area in the highest O(3) treatment had decreased relative to the controls by 26, 24 and 9% for Clones 216, 259 and 271, respectively”
t0“aspen”
Title
Photosynthetic productivity of aspen clones varying in sensitivity to tropospheric ozone
M. D. Coleman; J. G. Isebrands; R. E. Dickson; et al. Tree Physiology 1995. doi:10.1093/treephys/15.9.585
Other claims from this paper (19)
- Observation Early-season ozone lowered mature-leaf photosynthesis in all clones.
- Intervention effect Early-season ozone lowered photosynthesis in recently mature leaves only in sensitive Clone 259.
- Intervention effect Midseason ozone lowered photosynthesis in recently mature and mature leaves of sensitive Clone 259.
- Intervention effect Midseason ozone had no effect on recently mature leaf photosynthesis of tolerant Clone 216.
- Intervention effect Late-season photosynthesis in both leaf ages of Clone 216 was lower than in filtered-air controls.
- Intervention effect Ozone decreased mature-leaf photosynthesis in Clone 271.
- Intervention effect Ozone increased or did not affect recently mature-leaf photosynthesis in Clone 271.
- Observation Seedling ozone response patterns resembled clone patterns but were smaller in magnitude.
- Observation Ozone exposed clones showed early leaf abscission.
- Observation Clones 216 and 259 lost more leaf area than Clone 271.
- Intervention effect At the highest ozone treatment, Clone 216 leaf area was 26% below controls by late August.
- Intervention effect At the highest ozone treatment, Clone 271 leaf area was 9% below controls by late August.
- Intervention effect Ozone reduced whole-tree photosynthesis by 23% in Clone 271.
- Intervention effect Ozone reduced whole-tree photosynthesis by 56% in Clone 216.
- Intervention effect Ozone reduced whole-tree photosynthesis by 56% in Clone 259.
- Intervention effect Ozone accompanied a 19% biomass decline in Clone 271.
- Intervention effect Ozone accompanied a 28% biomass decline in Clone 216.
- Intervention effect Ozone accompanied a 47% biomass decline in Clone 259.
- Mechanism Reduced foliage photosynthetic productivity largely determined the ozone impact on biomass.