Planta

, Volume 180, Issue 3, pp 400–409

Effect of high light on the efficiency of photochemical energy conversion in a variety of lichen species with green and blue-green phycobionts

  • Barbara Demmig-Adams
  • Cristina Máguas
  • William W. AdamsIII
  • Angelika Meyer
  • Ellen Kilian
  • Otto L. Lange
Article

DOI: 10.1007/BF01160396

Cite this article as:
Demmig-Adams, B., Máguas, C., Adams, W.W. et al. Planta (1990) 180: 400. doi:10.1007/BF01160396

Abstract

Exposure to high light induced a quantitatively similar decrease in the rate of photosynthesis at limiting photon flux density (PFD) and of photosystem II (PSII) photochemical efficiency, FV/FM, in both green and blue-green algal lichens which were fully hydrated. Such depressions in the efficiency of photochemical energy conversion were generally reversible in green algal lichens but rather sustained in blue-green algal lichens. This greater susceptibility of blue-green algal lichens to sustained photoinhibition was not related to differences in the capacity to utilize light in photosynthesis, since the light-and CO2-saturated rates of photosynthetic O2 evolution were similar in the two groups. These reductions of PSII photochemical efficiency were, however, largely prevented in lichen thalli which were fully desiccated prior to exposure to high PFD. Thalli of green algal lichens which were allowed to desiccate during the exposure to high light exhibited similar recovery kinetics to those which were kept fully hydrated, whereas bluegreen algal lichens which became desiccated during a similar exposure exhibited greatly accelerated recovery compared to those which were kept fully hydrated. Thus, green algal lichens were able to recover from exposure to excessive PFDs when thalli were in either the hydrated or desiccated state during such an exposure, whereas in blue-green algal lichens the decrease in photochemical efficiency was reversible in thalli illuminated in the desiccated state but rather sustained subsequent to illumination of thalli in the hydrated state.

Key words

Chlorophyll fluorescence Chlorophyta Cyanobacteria Desiccation Lichens Light stress Photoinhibition in phycobionts Phycobiont 

Abbreviations and Symbols

Fo

yield of instantaneous fluorescence

FM

maximum yield of fluorescence induced by pulses of saturating light

FV

variable yield of fluorescence

PFD

photon flux density (400–700 nm)

PSII

photosystem II

Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Barbara Demmig-Adams
    • 1
  • Cristina Máguas
    • 2
  • William W. AdamsIII
    • 1
  • Angelika Meyer
    • 1
  • Ellen Kilian
    • 1
  • Otto L. Lange
    • 1
  1. 1.Lehrstuhl für Botanik IIUniversität WürzburgWürzburgGermany
  2. 2.Departamento de Biologia VegetalFaculdade de Ciências da Universidade de LisboaLisboaPortugal
  3. 3.Department of Environmental, Population, and Organismic BiologyUniversity of ColoradoBoulderUSA

Personalised recommendations