Mixotrophic growth modifies the response of Spirulina (Arthrospira) platensis (Cyanobacteria) cells to light

Avigad Vonshak, Suk Man Cheung, Feng Chen

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

Spirulina (Arthrospira) platensis (Nordstedt) Geitlet cells grown under mixotrophic conditions exhibit a modified response to light. The maximal photosynthetic rate and the light saturation value of mixotrophic cultures were higher than those of the photoautotrophic cultures. Dark respiration and light compensation point were also significantly higher in the mixotrophically grown cells. As expected, the mixotrophic cultures grew faster and achieved a higher biomass concentration than the photoautotrophic cultures. In contrast, the growth rate of the photoautotrophic cultures was more sensitive to light. The differences between the two cultures were also apparent in their responses to exposure to high photon flux density of 3000 μmol·m-2·s-1. The light-dependent O2 evolution rate and the maximal efficiency of photosystem II photochemistry declined more rapidly in photoautotrophically grown than in mixotrophically grown cells as a result of exposure to high photon flux density. Although both cultures recovered from the high photon flux density stress, the mixotrophic culture recovered faster and to a higher extent. Based on the above results, growth of S. platensis with a fixed carbon source has a significant effect on photosynthetic activity.

Original languageEnglish
Pages (from-to)675-679
Number of pages5
JournalJournal of Phycology
Volume36
Issue number4
DOIs
StatePublished - 1 Jan 2000

Keywords

  • Growth rate
  • Mixotrophic
  • PS II
  • Photoinhibition
  • Photosynthesis
  • Spirulina (Arthrospira) platensis

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

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