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Rising CO2 Interacts with Growth Light and Growth Rate to Alter Photosystem II Photoinactivation of the Coastal Diatom Thalassiosira pseudonana

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  • Gang Li
  • Douglas A Campbell

Abstract

We studied the interactive effects of pCO2 and growth light on the coastal marine diatom Thalassiosira pseudonana CCMP 1335 growing under ambient and expected end-of-the-century pCO2 (750 ppmv), and a range of growth light from 30 to 380 µmol photons·m−2·s−1. Elevated pCO2 significantly stimulated the growth of T. pseudonana under sub-saturating growth light, but not under saturating to super-saturating growth light. Under ambient pCO2 susceptibility to photoinactivation of photosystem II (σi) increased with increasing growth rate, but cells growing under elevated pCO2 showed no dependence between growth rate and σi, so under high growth light cells under elevated pCO2 were less susceptible to photoinactivation of photosystem II, and thus incurred a lower running cost to maintain photosystem II function. Growth light altered the contents of RbcL (RUBISCO) and PsaC (PSI) protein subunits, and the ratios among the subunits, but there were only limited effects on these and other protein pools between cells grown under ambient and elevated pCO2.

Suggested Citation

  • Gang Li & Douglas A Campbell, 2013. "Rising CO2 Interacts with Growth Light and Growth Rate to Alter Photosystem II Photoinactivation of the Coastal Diatom Thalassiosira pseudonana," PLOS ONE, Public Library of Science, vol. 8(1), pages 1-13, January.
    • Handle: RePEc:plo:pone00:0055562
    DOI: 10.1371/journal.pone.0055562
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    1. Kunshan Gao & Juntian Xu & Guang Gao & Yahe Li & David A. Hutchins & Bangqin Huang & Lei Wang & Ying Zheng & Peng Jin & Xiaoni Cai & Donat-Peter Häder & Wei Li & Kai Xu & Nana Liu & Ulf Riebesell, 2012. "Rising CO2 and increased light exposure synergistically reduce marine primary productivity," Nature Climate Change, Nature, vol. 2(7), pages 519-523, July.
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