| JUPA, Radek, Josef HÁJEK, Jana HAZDROVÁ and Miloš BARTÁK. Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation. Czech Polar Reports. Brno: Masaryk University, 2012, vol. 2, No 1, p. 31 - 41. ISSN 1805-0689. |
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@article{1070676,
author = {Jupa, Radek and Hájek, Josef and Hazdrová, Jana and Barták, Miloš},
article_location = {Brno},
article_number = {1},
keywords = {Quantum yield; water potential; chlorophyll fluorescence; Photochemical Reflectance Index; lichen; water stress},
language = {eng},
issn = {1805-0689},
journal = {Czech Polar Reports},
title = {Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation},
url = {http://www.sci.muni.cz/CPR/3cislo/Jupa-web.pdf},
volume = {2},
year = {2012}
}
TY - JOUR
ID - 1070676
AU - Jupa, Radek - Hájek, Josef - Hazdrová, Jana - Barták, Miloš
PY - 2012
TI - Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation
JF - Czech Polar Reports
VL - 2
IS - 1
SP - 31 - 41
EP - 31 - 41
PB - Masaryk University
SN - 18050689
KW - Quantum yield
KW - water potential
KW - chlorophyll fluorescence
KW - Photochemical Reflectance Index
KW - lichen
KW - water stress
UR - http://www.sci.muni.cz/CPR/3cislo/Jupa-web.pdf
L2 - http://www.sci.muni.cz/CPR/3cislo/Jupa-web.pdf
N2 - This study aimed to evaluate the effective photosynthetic quantum yield ( Phi PSII) and the Photochemical Reflectance Index (PRI) for assessment of photosynthetic performance of two Umbilicaria lichens during gradual desiccation of their thalli. U. cylindrica and U. decussata exhibited curvilinear relationship (S-shape curve) of decreasing Phi PSII values with decreasing water potential (WP) of thalli. During initial phase of desiccation (WP from 0 to -10 MPa), no decrease of Phi PSII was apparent, further desiccation (WP from -10 to -20 MPa) led to fast Phi PSII decrease from 0.6 to 0.1 indicating strong inhibition of photosynthetic processes. Critical WP at which photosythetic processes are fully inhibited was found bellow -25 MPa in both lichen species. Photochemical Reflectance Index (PRI) exhibited curvilinear increase with thalli desiccation (decreasing WP). At full thallus hydration, the PRI reached the value of -0.18 in both species. Under strong dehydration (WP from -20 to -30 MPa), however, U. cylindrica showed somewhat lower value (-0.04) than U.decussata (-0.02 MPa). PRI to WP relationship is discussed and compared to existing evidence from higher plants and poikilohydric organisms.
ER -
JUPA, Radek, Josef HÁJEK, Jana HAZDROVÁ and Miloš BARTÁK. Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation. \textit{Czech Polar Reports}. Brno: Masaryk University, 2012, vol.~2, No~1, p.~31 - 41. ISSN~1805-0689.
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