Inhibition of photosynthetic processes in foliose lichens
induced by temperature and osmotic stress.

J 2006

Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress.

HÁJEK, Josef, Miloš BARTÁK and Jaroslava DUBOVÁ

Basic information

Original name

Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress.

Name in Czech

Inhibice fotosyntetických proces u foliózních liejník indukovaná teplotou a osmotickým stresem.

Authors

HÁJEK, Josef (203 Czech Republic, guarantor), Miloš BARTÁK (203 Czech Republic) and Jaroslava DUBOVÁ (203 Czech Republic)

Edition

Biologia Plantarum, Dordrecht, KLUWER ACADEMIC PUBLISHERS, 2006, 0006-3134

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10600 1.6 Biological sciences

Country of publisher

Czech Republic

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 1.198

RIV identification code

RIV/00216224:14310/06:00015688

Organization unit

Faculty of Science

UT WoS

000238531000022

Keywords in English

photosynthesis; water potential; dehydration; Lasallia pustulata; Umbilicaria hirsuta; sucrose; chlorophyll fluorescence; thallus anatomy

Abstract

ORIG CZ

V originále

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 -18.8 MPa) typical by substantial change in Chl fluorescence parameters. Effects of thallus anatomy on species-specific response to osmotic dehydration is discussed and attributed to results obtained by optical microscopy and Chl fluorescence imaging technique.

In Czech

Prace popisuje vliv nizke teploty stelky a osmotickeho stresu na primarni fotochemicke procesy fotosyntezy lisejniku.

Links

GP206/03/P140, research and development project

Name: Limitace fotochemických a biochemických procesů fotosyntézy lišejníků za nízkých teplot

Investor: Czech Science Foundation, Limitation of photochemical and biochemical processes of photosynthesis of lichens under low temperature

Citovat

HÁJEK, Josef, Miloš BARTÁK and Jaroslava DUBOVÁ. Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress. Biologia Plantarum. Dordrecht: KLUWER ACADEMIC PUBLISHERS, 2006, vol. 50, No 4, p. 624-634, 10 pp. ISSN 0006-3134.

@article{635688,
   author = {Hájek, Josef and Barták, Miloš and Dubová, Jaroslava},
   article_location = {Dordrecht},
   article_number = {4},
   keywords = {photosynthesis; water potential; dehydration; Lasallia pustulata; Umbilicaria hirsuta; sucrose; chlorophyll fluorescence; thallus anatomy},
   language = {eng},
   issn = {0006-3134},
   journal = {Biologia Plantarum},
   note = {accepted 17 October 2005},
   title = {Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress.},
   volume = {50},
   year = {2006}
}

TY  - JOUR
ID  - 635688
AU  - Hájek, Josef - Barták, Miloš - Dubová, Jaroslava
PY  - 2006
TI  - Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress.
JF  - Biologia Plantarum
VL  - 50
IS  - 4
SP  - 624-634
EP  - 624-634
PB  - KLUWER ACADEMIC PUBLISHERS
SN  - 00063134
N1  - accepted 17 October 2005
KW  - photosynthesis
KW  - water potential
KW  - dehydration
KW  - Lasallia pustulata
KW  - Umbilicaria hirsuta
KW  - sucrose
KW  - chlorophyll fluorescence
KW  - thallus anatomy
N2  - 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 -18.8 MPa) typical by substantial change in Chl fluorescence parameters. Effects of thallus anatomy on species-specific response to osmotic dehydration is discussed and attributed to results obtained by optical microscopy and Chl fluorescence imaging technique.
ER  -

HÁJEK, Josef, Miloš BARTÁK and Jaroslava DUBOVÁ. Inhibition of photosynthetic processes in foliose lichens induced by temperature and osmotic stress. \textit{Biologia Plantarum}. Dordrecht: KLUWER ACADEMIC PUBLISHERS, 2006, vol.~50, No~4, p.~624-634, 10 pp. ISSN~0006-3134.

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