Water deficit under continuous light enhances the thermal stability of photosystem II in Homalothecium lutescens moss

Sándor Dulai, F. Horváth, Sándor Orbán, E. Darkó, Katalin Csizi, István Molnár

Research output: Contribution to journalArticle

Abstract

The thermal stability of photosystem II was examined under different (light and water deficit) treatments in the moss H. lutescens. The decrease in water content under continuous light effected a heat-tolerance increase, further intensified by increasing excitation energy levels. The breakpoints (Tc, Tp, F1/2) of the FS vs. T curves significantly shifted towards higher temperatures even under a 30-minute moderate (-1.3 MPa) osmotic treatment, and this was partially inhibited by DTT. Both moderate and higher water deficit (-2.5 MPa) resulted in an increase in thermal stability, independent of the excitation energy level. This effect of water deficit remained observable over a fairly long period. Since in a dark-adapted state the critical values ofthe F0 vs. T curves did not shift towards significantly higher temperatures with an increase in water deficit, it seems likely that rapid thermal stability increase of PS II induced by water deficit occurs only in energized photosynthetic membranes.

Original languageEnglish
Pages (from-to)159-160
Number of pages2
JournalActa Biologica Szegediensis
Volume46
Issue number3-4
Publication statusPublished - 2002

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Bryophyta
Photosystem II Protein Complex
thermal stability
photosystem II
mosses and liverworts
Thermodynamic stability
Hot Temperature
Light
Water
Excitation energy
Electron energy levels
Photosynthetic membranes
water
osmotic treatment
Water treatment
Temperature
Water content
Water Purification
energy
heat tolerance

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Cell Biology
  • Applied Microbiology and Biotechnology
  • Neuroscience(all)

Cite this

Water deficit under continuous light enhances the thermal stability of photosystem II in Homalothecium lutescens moss. / Dulai, Sándor; Horváth, F.; Orbán, Sándor; Darkó, E.; Csizi, Katalin; Molnár, István.

In: Acta Biologica Szegediensis, Vol. 46, No. 3-4, 2002, p. 159-160.

Research output: Contribution to journalArticle

Dulai, Sándor ; Horváth, F. ; Orbán, Sándor ; Darkó, E. ; Csizi, Katalin ; Molnár, István. / Water deficit under continuous light enhances the thermal stability of photosystem II in Homalothecium lutescens moss. In: Acta Biologica Szegediensis. 2002 ; Vol. 46, No. 3-4. pp. 159-160.
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