Effects of ozone exposure on growth and photosynthesis of beach seedlings (Fagus sylvatica)

Citation
K. Bortier et al., Effects of ozone exposure on growth and photosynthesis of beach seedlings (Fagus sylvatica), NEW PHYTOL, 146(2), 2000, pp. 271-280
Citations number
44
Categorie Soggetti
Plant Sciences
Journal title
NEW PHYTOLOGIST
ISSN journal
0028646X → ACNP
Volume
146
Issue
2
Year of publication
2000
Pages
271 - 280
Database
ISI
SICI code
0028-646X(200005)146:2<271:EOOEOG>2.0.ZU;2-K
Abstract
The effects of ambient and elevated ozone levels on growth and photosynthes is of beech (Fagus sylvatica) were studied by exposing seedlings in open-to p chambers for one growing season to three treatments: charcoal-filtered (C F), non-filtered (NF) and non-filtered air with addition of ozone (30 ppb o zone) on clear days for 8-10 h d(-1)(NF+). Ambient levels were relatively r ow and accumulated to an AOT40 (accumulated exposure over a threshold of 40 ppb) of 4055 ppb h (for the period 23 Apr-30 Sept). The NF+ chambers recei ved an AOT40 of 8880 ppb h. Throughout the growing season we measured growt h and photosynthetic properties. The treatments did not cause strong effect s: measurements of gas exchange (light-saturated assimilation rate, CO2 and light-response curves) and chlorophyll fluorescence showed slight and most ly non-significant reductions of several parameters. No significant differe nces were found for growth, though in the NF+ treatment (AOT40 8880 ppb h) the relative growth rate for diameter increment was at times reduced by 12% compared with the control treatment.