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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Basic information
Original name Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation
Name in Czech Mezidruhové rozdíly ve fotosyntetické účinnosti a spektrální reflektanci mezi dvěma druhy Umbilicaria ze Svalbard-u v průběhu řízeného vysychání.
Authors JUPA, Radek (203 Czech Republic), Josef HÁJEK (203 Czech Republic), Jana HAZDROVÁ (203 Czech Republic) and Miloš BARTÁK (203 Czech Republic, guarantor, belonging to the institution).
Edition Czech Polar Reports, Brno, Masaryk University, 2012, 1805-0689.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10600 1.6 Biological sciences
Country of publisher Czech Republic
Confidentiality degree is not subject to a state or trade secret
WWW full_text_paper
RIV identification code RIV/00216224:14310/12:00061545
Organization unit Faculty of Science
Keywords (in Czech) kvantový výtěžek; vodní potenciál; fluorescence chlorofylu; PRI; lišejník,;vodní stres
Keywords in English Quantum yield; water potential; chlorophyll fluorescence; Photochemical Reflectance Index; lichen; water stress
Tags AKR, rivok
Tags International impact, Reviewed
Changed by Changed by: prof. Ing. Miloš Barták, CSc., učo 57. Changed: 28. 10. 2012 16:12.
Abstract
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.
Abstract (in Czech)
Tato publikace je zaměřena na souběžné sledování indexu PRI a efektivního kvantového výtěžku fyotoyntézy během vysychání stélek dvou druhů lišejníků rodu Umbilicaria ze souostroví Špicberky (Svalbard). Byl zjištěno, že PRI s postupujícím vysycháním roste, zatímco u listů vyšších rostlin klesá.
Links
LM2010009, research and development projectName: Projekt CzechPolar - České polární stanice: Stavba a operační náklady
Investor: Ministry of Education, Youth and Sports of the CR, Large Infrastructures for Research, Development and Innovation
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