Antioxidative mechanisms in a lichen <i>Lasallia pustulata</i> exposed to light and dehydration stress. s

Investor logo
Investor logo

Warning

This publication doesn't include Faculty of Economics and Administration. It includes Faculty of Science. Official publication website can be found on muni.cz.
Title in English Antioxidative mechanisms in a lichen <i>Lasallia pustulata</i> exposed to light and dehydration stress.
Authors

BARTÁK Miloš VRÁBLÍKOVÁ Hana ŠTEPIGOVÁ Jana HÁJEK Josef VEČEŘOVÁ Kristýna LANG Jaroslav VÁCZI Peter

Year of publication 2006
Type Article in Proceedings
Conference FESPB 2006 Congress: Book of Abstracts
MU Faculty or unit

Faculty of Science

Citation
Web Congress website
Field Botany
Keywords glutathione, zeaxanhtin, DEPS, photosynthesis, chlorophyll fluorescence
Description In photosynthetizing partners of lichens, majority of stresses produce reactive oxygen species (ROS). Negative effects of ROS are alleviated by antioxidants, e.g. zeaxanthin, glutathione, catalase, superoxidedismutase. In previous studies, we demonstrated that the capacity of zeaxanthin (Z) formation is sufficient to cope with a high light (HL) stress in fully hydrated lichen thalli. The aim of presented study is to evaluate the dynamics of antioxidants in algal partner of L. pustulata exposed to several HL and dehydration regimes. Treated by a short-term HL (typically 1800 micromol m-2 s-1), hydrated lichens showed photoinhibition of photosynthesis (decrease in Fv/Fm, Yield PSII, increase in NPQ) and activation of antioxidative mechanisms. Z increased and DEPS reached 0.5, total glutathione decreased to a half of control and was largely oxidized. The changes were reversible, the above parameters reached pre-treated values within 10-24 h relaxation in dark. Dehydration at dark and LL (300 micromol m-2 s-1) led to the same DEPS in dry state reached after 5 h. However, DEPS increased more rapidly in LL than in dark during the early dehydration (water potential 0 to -10 MPa).
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.