Journal
PHOTOSYNTHETICA
Volume 46, Issue 2, Pages 286-290Publisher
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-008-0050-8
Keywords
chlorophyll fluorescence; photosynthetic quenching; photoinhibition; xanthophyll cycle
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Hydrated thalli of the lichen Lobaria pulmonaria were either preconditioned to dim irradiance (DI, 5 mu mol m(-2) s(-1)) or medium irradiance (MI, 200 mu mol m(-2) s(-1)) for 6 h. After this 6 h period, the thalli were allowed to desiccate under the two respective irradiances. Thereafter, these dry lichens were exposed to high irradiance (HI, 1 000 mu mol m(-2) s(-1)) for 60 h. After this HI treatment, the maximal photochemical quantum yield (F-V/F-M) and the de-epoxidation state of xanthophyll cycle pigments (DEPS) were highest in thalli preconditioned to MI. Hence irradiance in the last hydrated period before sampling is significant for the physiological state of lichens. A standardized irradiance pre-treatment before start of experiments is recommended.
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