Model-based Analysis of Avoidance of Ozone Stress by Stomatal Closure in Siebold's Beech (Fagus Crenata)

Overview

Journal Ann Bot

Publisher Oxford University Press

Specialty Biology

Date 2013 Aug 2

PMID 23904447

Citations 7

Authors

Yasutomo Hoshika

Makoto Watanabe

Naoki Inada

Takayoshi Koike

Affiliations

Soon will be listed here.

Abstract

Background And Aims: Resistance of plants to ozone stress can be classified as either avoidance or tolerance. Avoidance of ozone stress may be explained by decreased stomatal conductance during ozone exposure because stomata are the principal interface for entry of ozone into plants. In this study, a coupled photosynthesis-stomatal model was modified to test whether the presence of ozone can induce avoidance of ozone stress by stomatal closure.

Methods: The response of Siebold's beech (Fagus crenata), a representative deciduous tree species, to ozone was studied in a free-air ozone exposure experiment in Japan. Photosynthesis and stomatal conductance were measured under ambient and elevated ozone. An optimization model of stomata involving water, CO2 and ozone flux was tested using the leaf gas exchange data.

Key Results: The data suggest that there are two phases in the avoidance of ozone stress via stomatal closure for Siebold's beech: (1) in early summer ozone influx is efficiently limited by a reduction in stomatal conductance, without any clear effect on photosynthetic capacity; and (2) in late summer and autumn the efficiency of ozone stress avoidance was decreased because the decrease in stomatal conductance was small and accompanied by an ozone-induced decline of photosynthetic capacity.

Conclusions: Ozone-induced stomatal closure in Siebold's beech during early summer reduces ozone influx and allows the maximum photosynthetic capacity to be reached, but is not sufficient in older leaves to protect the photosynthetic system.

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