Interspecific differences in photosynthetic efficiency and
spectral reflectance in two Umbilicaria species from Svalbard
during controlled desiccation

J 2012

Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation

JUPA, Radek, Josef HÁJEK, Jana HAZDROVÁ and Miloš BARTÁK

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

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

References:

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

Abstract

ORIG CZ

V originále

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.

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 project

Name: Projekt CzechPolar - České polární stanice: Stavba a operační náklady

Investor: Ministry of Education, Youth and Sports of the CR

Files attached

Jupa-web.pdf

Find similar documents

Citovat

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.

@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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