Abstract
Stomatal ozone flux is closely related to ozone injury to plants. Jarvis-type multiplicative model has been recommended for estimating stomatal ozone flux in forest trees. Ozone can change stomatal conductance by both stomatal closure and less efficient stomatal control (stomatal sluggishness). However, current Jarvis-type models do not account for these ozone effects on stomatal conductance in forest trees. We examined seasonal course of stomatal conductance in two common deciduous tree species native to northern Japan (white birch: Betula platyphylla var. japonica; deciduous oak: Quercus mongolica var. crispula) grown under free-air ozone exposure. We innovatively considered stomatal sluggishness in the Jarvis-type model using a simple parameter, s, relating to cumulative ozone uptake (defined as POD: phytotoxic ozone dose). We found that ozone decreased stomatal conductance of white birch leaves after full expansion (-28%). However, such a reduction of stomatal conductance by ozone fell in late summer (-10%). At the same time, ozone reduced stomatal sensitivity of white birch to VPD and increased stomatal conductance under low light conditions. In contrast, in deciduous oak, ozone did not clearly change the model parameters. The consideration of both ozone-induced stomatal closure and stomatal sluggishness improved the model performance to estimate stomatal conductance and to explain the dose-response relationship on ozone-induced decline of photosynthesis of white birch. Our results indicate that ozone effects on stomatal conductance (i.e. stomatal closure and stomatal sluggishness) are crucial for modelling studies to determine stomatal response in deciduous trees, especially in species sensitive to ozone.
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Claims 6
Claim · model-written summary
Ozone lowered white birch leaf stomatal conductance by 28% after full expansion.
- Taxon
- white birch
Betula pendulae0 - Organ / stage
- leaves after full expansione0
- Treatment
- ozonee0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
- Value
- -28%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone decreased stomatal conductance of white birch leaves after full expansion (-28%)”
Claim · model-written summary
The ozone-related reduction of birch stomatal conductance weakened to 10% in late summer.
- Taxon
- white birchBetula pendulae1
- Outcome
- stomatal conductancee0
- Direction
- reductione0
- Value
- -10%e0
- Qualifier
- late summere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“such a reduction of stomatal conductance by ozone fell in late summer (-10%)”
e1“ozone decreased stomatal conductance of white birch leaves after full expansion (-28%)”
Claim · model-written summary
Ozone reduced white birch stomatal sensitivity to VPD.
- Taxon
- white birchBetula pendulae0
- Treatment
- ozonee0
- Outcome
- stomatal sensitivity of white birch to VPDe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone reduced stomatal sensitivity of white birch to VPD”
Claim · model-written summary
Ozone increased white birch stomatal conductance under low light.
- Taxon
- white birchBetula pendulae0
- Treatment
- ozonee0
- Outcome
- stomatal conductancee0
- Direction
- increasede0
- Qualifier
- under low light conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ozone reduced stomatal sensitivity of white birch to VPD and increased stomatal conductance under low light conditions”
Claim · model-written summary
Ozone did not clearly change the stomatal model parameters in deciduous oak.
Not reportedComparator
Verbatim
e0“in deciduous oak, ozone did not clearly change the model parameters”
Claim · model-written summary
Including stomatal closure and sluggishness improved estimates of birch stomatal conductance and the ozone dose response of photosynthesis.
- Taxon
- white birchBetula pendulae0
- Outcome
- model performance to estimate stomatal conductance and to explain the dose-response relationship on ozone-induced decline of photosynthesise0
- Direction
- improvede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The consideration of both ozone-induced stomatal closure and stomatal sluggishness improved the model performance to estimate stomatal conductance and to explain the dose-response relationship on ozone-induced decline of photosynthesis of white birch.”
The same questions in other papers
ozone · physiology: gas exchange · Betula pendula (white birch)Results differ
7 in the opposite direction
- negative
- negative
- negative
4 papers more in this group
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