Combined effect of NaCl and temperature on chlorophyll fluorescence parameters in Lasallia pustulata and Umbilicaria hirsuta

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Authors

HÁJEK Josef BARTÁK Miloš

Year of publication 2003
Type Article in Proceedings
Conference Book of Abstracts. Plant Physiology Conference of Ph.D. Students and Young Scientists
MU Faculty or unit

Faculty of Science

Citation
Field Botany
Keywords lichens; photosynthesis; osmotic stress; water potential; dehydration
Description In both lichen species measured under 22 and 5 degC, increased osmotic stress led to a decrease in Fv/Fm ratio of chlorophyll fluorescence and also in quantum yield of photosystem two. Time courses of background chlorophyll fluorescence revealed two phases of phases of osmotic stress: (1)mild - induced by water potential of about-2.3 MPa, and (b)heavy - induced by water potential of about -17.0 Mpa.
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