Claim · model-written summary
Increasing ozone sensitivity with exposure duration is explained by a lower photosynthesis to stomatal conductance ratio in late summer.
- Taxon
- Betula pendula
Betula pendulae0 - Outcome
- Increasing ozone sensitivity with duration of exposuree6
- Qualifier
- a lower photosynthesis to stomatal conductance ratio during the late summere6
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“European white birch (Betula pendula Roth)”
e6“Increasing ozone sensitivity with duration of exposure was explained by a change in growth form (relatively reduced foliage mass), a lower photosynthesis to stomatal conductance ratio during the late summer, and deleterious carry-over effects arising from the reduced number of over-wintering buds”
Title
Responses of selected birch (Betula pendula Roth) clones to ozone change over time
E. OKSANEN Plant Cell & Environment 2003. doi:10.1046/j.1365-3040.2003.01020.x
Other claims from this paper (9)
- Intervention effect In the sensitive clone, ozone reduced growth by 12–48% after 6 years of exposure, a significant difference.
- Intervention effect In the tolerant clone, ozone reduced growth by 1–38% in larger trees, a significant difference in stem volume.
- Observation Saplings of the tolerant clone were previously unaffected by ozone in growth.
- Intervention effect Ozone stress significantly reduced leaf-level net photosynthesis in both clones during the late summer.
- Intervention effect Ozone stress significantly increased stomatal conductance rates in both clones during the late summer.
- Intervention effect Ozone stress led to a lower carbon gain for bud formation.
- Observation Ozone stress led to the onset of visible foliar injuries.
- Mechanism Increasing ozone sensitivity with exposure duration is explained by a change in growth form.
- Mechanism Increasing ozone sensitivity with exposure duration is explained by deleterious carry-over effects from fewer over-wintering buds.