Desiccation and rehydration responses of desiccation tolerant moss and lichen species from a temperate semidesert grassland

Z. Csintalan, Zoltán Takács, Michael C F Proctor, Hartmut K. Lichtenthaler, Z. Tuba

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

CO2 exchange (CO2 assimilation, dark respiration), potential photochemical activity and blue and red fluorescence ratios (F450/F690, F690/F735) of the desiccation-tolerant (DT) ectohydric moss (Tortula ruralis) and two DT lichens (Cladonia convoluta and C. furcata) from a temperate semidesert grassland during desiccation and rehydration are reported. Optimal water content for carbon fixation (RWC = 100%) was less than 50% of the saturation water content in all investigated species. The water-content compensation point of CO2 assimilation was also low and ranges 6-8% of saturation water content. Thylakoid membrane activity as measured by slow chlorophyll fluorescence is unchanged through a broader range of water content. On rehydration photosynthesis recovered fully and rapidly within 1 h in all three species. The low water content requirement for net CO2 assimilation in the three DT species allows them to revive periodically and prosper during the dry seasons. These plants can gain water from dew or air humidity at dawn and maintain slight positive carbon balance day by day. During the desiccation-rehydration cycles blue/(far)red and red/far red fluorescence ratios (F450/F690, F450/F735, F690/F735) suggest changes in cell volumes and in the optical properties of the plants rather than shifts in the photosynthetic pigment and secondary metabolite levels.

Original languageEnglish
Pages (from-to)71-80
Number of pages10
JournalJournal of the Hattori Botanical Laboratory
Volume84
Issue number1
Publication statusPublished - Jul 1998

Fingerprint

rehydration
desiccation (plant physiology)
lichens
mosses and liverworts
grasslands
water content
carbon dioxide
assimilation (physiology)
fluorescence
Cladonia
dew
Calvin cycle
optical properties
cell respiration
thylakoids
secondary metabolites
humidity
dry season
pigments
photosynthesis

Keywords

  • C. furcata
  • Cladonia convoluta
  • CO gas exchange
  • Desiccation
  • Fluorescence spectra
  • Lichen
  • Moss
  • Rehydration
  • Slow chlorophyll fluorescence
  • Tortula ruralis

ASJC Scopus subject areas

  • Plant Science

Cite this

Desiccation and rehydration responses of desiccation tolerant moss and lichen species from a temperate semidesert grassland. / Csintalan, Z.; Takács, Zoltán; Proctor, Michael C F; Lichtenthaler, Hartmut K.; Tuba, Z.

In: Journal of the Hattori Botanical Laboratory, Vol. 84, No. 1, 07.1998, p. 71-80.

Research output: Contribution to journalArticle

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