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Ozone-induced stomatal sluggishness changes stomatal parameters of Jarvis-type model in white birch and deciduous oak.

08:00 EDT 21st September 2017 | BioPortfolio

Summary of "Ozone-induced stomatal sluggishness changes stomatal parameters of Jarvis-type model in white birch and deciduous oak."

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 may change stomatal conductance by both stomatal closure and less efficient stomatal control (stomatal sluggishness). However, current Jarvis-type models did not account for these ozone effects on stomatal conductance in forest trees. We thus 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 a free-air ozone exposure. We innovatively considered stomatal sluggishness into Jarvis-type model by 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 was diminished in late summer (-10%). At the same time, ozone reduced stomatal sensitivity of white birch to vapor pressure deficit and increased stomatal conductance under low light condition. On the other hand, in deciduous oak, ozone did not change clearly 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 about ozone-induced decline of photosynthesis of white birch. Our results indicate that the 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 about sensitive species to ozone. This article is protected by copyright. All rights reserved.

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Name: Plant biology (Stuttgart, Germany)
ISSN: 1438-8677
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