PMID: 9637072Jun 24, 1998Paper

Photoinhibitory damage is modulated by the rate of photosynthesis and by the photosystem II light-harvesting chlorophyll antenna size

Planta
I Baroli, A Melis

Abstract

We investigated the effect of photosynthetic electron transport and of the photosystem II (PSII) chlorophyll (Chl) antenna size on the rate of PSII photoinhibitory damage. To modulate the rate of photosynthesis and the light-harvesting capacity in the unicellular chlorophyte Dunaliella salina Teod., we varied the amount of inorganic carbon in the culture medium. Cells were grown under high irradiance either with a limiting supply of inorganic carbon, provided by an initial concentration of 25 mM NaHCO3, or with supplemental CO2 bubbled in the form of 3% CO2 in air. The NaHCO3-grown cells displayed slow rates of photosynthesis and had a small PSII light-harvesting Chl antenna size (60 Chl molecules). The half-time of PSII photodamage was 40 min. When switched to supplemental CO2 conditions, the rate of photodamage was retarded to a t1/2 = 70 min. Conversely, CO2-supplemented cells displayed faster rates of photosynthesis and a larger PSII light-harvesting Chl antenna size (500 Chl molecules). They also showed a rate of photodamage with t1/2 = 40 min. When depleted of CO2, the rate of photodamage was accelerated (t1/2 = 20 min). These results indicate that the in-vivo susceptibility to photodamage is modulated by the rate of forw...Continue Reading

Citations

Jun 8, 2006·Photosynthesis Research·Michael Y RoledaChristian Wiencke
Aug 27, 2009·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Willem Hendrik van de Poll, Anita Gerry Johanna Buma
Mar 12, 2004·Annual Review of Plant Physiology and Plant Molecular Biology·Krishna K. Niyogi
May 5, 2001·Annual Review of Plant Physiology and Plant Molecular Biology·Elizabeth H Harris
Jan 29, 2013·Plant Science : an International Journal of Experimental Plant Biology·Patricia L SáezDarcy G Ríos
May 9, 2012·Journal of Photochemistry and Photobiology. B, Biology·Hazem M KalajiKarolina Bosa
Feb 14, 2012·Journal of Theoretical Biology·Ioannis A PapadakisKonstadia Lika
Apr 19, 2003·Physiologia Plantarum·Willem H. Van De PollAnneke M. Breeman
Sep 4, 2007·Plant Biotechnology Journal·Jan H MussgnugBen Hankamer
Apr 20, 2006·Photochemistry and Photobiology·Josée Nina BouchardDouglas A Campbell
Apr 27, 2007·Biochimica Et Biophysica Acta·Ismayil S ZulfugarovChoon-Hwan Lee
Oct 5, 2017·Photosynthesis Research·Eliezer M SchwarzJohn E Froehlich

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