e-journal

Model-based analysis of avoidance of ozone stress by stomatal closure in Siebold’s beech (Fagus crenata)

---

† 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.Anoptimization model of stomata involvingwater,CO2 and ozone fluxwas 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.

Key words: Tropospheric ozone, stomatal conductance, stomatal closure, stress avoidance, photosynthesis–
stomatal model, Siebold’s beech, Fagus crenata.

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

-

Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

Annals of Botany 112: 1149–1158, 2013

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

FISIOLOGI TANAMAN

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar