C. Kurz et al., THE COMBINED EFFECT OF CO2, OZONE, AND DROUGHT ON THE RADICAL SCAVENGING SYSTEM OF YOUNG OAK TREES (QUERCUS-PETRAEA) - A PHYTOTHRON STUDY, Chemosphere, 36(4-5), 1998, pp. 783-788
In order to study the combined effects of CO2, ozone, and drought, we
simulated in a controlled environment the climatic conditions of a Ger
man oak stand with high ozone (daytime: 80 ppb, control: 20 ppb) durin
g one vegetative period under a regime of low and high CO2 concentrati
on (370 vs 720 ppm) and drought (4 weeks < -800 hPa). To investigate t
he effects of CO2, ozone and drought on the radical scavenging system,
we monitored the level of glutathione, ascorbate, and a-tocopherol. H
owever, it is important that, under the regime of elevated CO2, the an
tioxidative behaviour of glutathione and ascorbate appears to be maske
d by their function as storage molecules for sulfur or carbon. (C)1998
Elsevier Science Ltd.