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Irradiance prior to and during desiccation improves the tolerance to excess irradiance in the desiccated state of the old forest lichen <i>Lobaria pulmonaria<i>

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ŠTEPIGOVÁ Jana GAUSLAA Yngvar CEMPÍRKOVÁ-VRÁBLÍKOVÁ Hana SOLHAUG Knut-Asbjorn

Rok publikování 2008
Druh Článek v odborném periodiku
Časopis / Zdroj Photosynthetica
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Botanika
Klíčová slova chlorophyll flurescence; photosynthetic quenching; photoinhibition; xanthophyll cycle
Popis Hydrated thalli of the lichen Lobaria pulmonaria were either preconditioned to dim irradiance (DI, 5 umol m-2 s-1) or medium irradiance (MI, 200 umol 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, 1000 uml m-2 s-1) for 60 h. After this HI treatment, the maximal photochemical quantum yield (Fv/Fm) 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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