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  • Negative effects of osmotically-induced dehydration of two foliose lichen species, Lasallia pustulata and Umbilicaria hirsuta, was studied at physiological (22 deg C), low (5 deg C) and freezing temperature (-10 deg C), using chlorophyll (Chl) fluorescence. In both species, exposition to increasing sucrose concentrations led to a pronounced decrease in potential (FV/FM), and actual (Fi2) quantum yields of photochemical processes in photosystem 2. Lasallia pustulata was more sensitive to osmotic stress, because comparable osmotic dehydration inhibited FV/FM, Fi2 more than in Umbilicaria hirsuta. In our study, critical concentration of sucrose that fully inhibited photochemical processes of photosynthesis was 2.5 M, which represented water potential (ŁZ) of ĄV18.8 MPa. Decrease in background Chl fluorecsence (F0) and increase in non-photochemical quenching (qN) revealed two phases of osmotic stress in lichens: phase I with no change (ŁZ 0 to -6.6 MPa) and phase II (ŁZ -11.3 to -18.
  • Negative effects of osmotically-induced dehydration of two foliose lichen species, Lasallia pustulata and Umbilicaria hirsuta, was studied at physiological (22 deg C), low (5 deg C) and freezing temperature (-10 deg C), using chlorophyll (Chl) fluorescence. In both species, exposition to increasing sucrose concentrations led to a pronounced decrease in potential (FV/FM), and actual (Fi2) quantum yields of photochemical processes in photosystem 2. Lasallia pustulata was more sensitive to osmotic stress, because comparable osmotic dehydration inhibited FV/FM, Fi2 more than in Umbilicaria hirsuta. In our study, critical concentration of sucrose that fully inhibited photochemical processes of photosynthesis was 2.5 M, which represented water potential (ŁZ) of ĄV18.8 MPa. Decrease in background Chl fluorecsence (F0) and increase in non-photochemical quenching (qN) revealed two phases of osmotic stress in lichens: phase I with no change (ŁZ 0 to -6.6 MPa) and phase II (ŁZ -11.3 to -18. (en)
Title
  • Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress.
  • Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress. (en)
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  • Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress.
  • Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress. (en)
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  • RIV/00216224:14310/06:00015688!RIV10-GA0-14310___
http://linked.open...avai/riv/aktivita
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  • P(GP206/03/P140)
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  • 4
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  • 479722
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  • RIV/00216224:14310/06:00015688
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  • photosynthesis; water potential; dehydration; Lasallia pustulata; Umbilicaria hirsuta; sucrose; chlorophyll fluorescence; thallus anatomy (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • CZ - Česká republika
http://linked.open...ontrolniKodProRIV
  • [455D597EE5E0]
http://linked.open...i/riv/nazevZdroje
  • Biologia Plantarum
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http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 50
http://linked.open...iv/tvurceVysledku
  • Barták, Miloš
  • Hájek, Josef
  • Dubová, Jaroslava
issn
  • 0006-3134
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  • 14310
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