Sub-optimal morning temperature induces photoinhibition in dense outdoor cultures of the alga Monodus subterraneus (Eustigmatophyta)

A. Vonshak, G. Torzillo, J. Masojidek, S. Boussiba

    Research output: Contribution to journalArticlepeer-review

    79 Scopus citations

    Abstract

    Diel changes in photosynthetic oxygen evolution and several photochemical parameters measured by chlorophyll fluorescence quenching and induction were measured in outdoor dense cultures of the alga Monodus subterraneus (Eustigmatophyta). Cultures were maintained under two temperature regimes. In one, a rise in temperature was initiated in the morning by the increase in solar radiation up to the optimal temperature of 28°C; in the other, a heating device was used to increase the rate of warming up in early morning. Although the two cultures were maintained at the same temperature and light intensity for most of the day, cultures exposed for only a short time to suboptimal morning temperature showed a larger decrease in almost all the photosynthetic parameters. By comparing the diel changes in maximal photochemistry efficiency of photosystem II, the electron transport rate and the photochemical and nonphotochemical chlorophyll fluorescence quenching of the cultures, we concluded that even a relatively short exposure to suboptimal morning temperatures induced photoinhibitory damage. The higher photochemical activity of the heated culture was also reflected in a significant increase in productivity, which was 60% higher in the morning heated cultures than in the non-heated cultures.

    Original languageEnglish
    Pages (from-to)1113-1118
    Number of pages6
    JournalPlant, Cell and Environment
    Volume24
    Issue number10
    DOIs
    StatePublished - 16 Oct 2001

    Keywords

    • Fluorescence
    • Low temperature stress
    • Outdoor cultures
    • Oxygen evolution
    • Photosynthesis

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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