Chilling damage to photosynthesis in young zea mays: II. Photochemical function of thylakoids in vivo

N. R. Baker, T. M. East, S. P. Long

Research output: Contribution to journalArticle

Abstract

Leaves of Zea mays L. cv. LG11 were chilled for 6 h at 5 °C in a high photon flux density. On return to 20 °C, the leaves showed a 45% decrease in the apparent quantum yield of photosynthetic oxygen evolution. The effects of this chill-treatment on the chlorophyll fluorescence induction kinetics of the leaves indicated a 20-25% decrease in the primary photochemical quantum yield of photosystem II. The fluorescence emission spectra of these leaves demonstrated a marked modification in the distribution of excitation energy within the photochemical apparatus of the thylakoid membranes, such that photosystem I was excessively favoured with respect to photosystem II. These chill-induced changes would result in an enhancement of cyclic over non-cyclic electron transport and account for a decrease in the apparent quantum yield of photosynthetic oxygen evolution.

Original languageEnglish (US)
Pages (from-to)189-197
Number of pages9
JournalJournal of experimental botany
Volume34
Issue number2
DOIs
StatePublished - Feb 1 1983

    Fingerprint

Keywords

  • Chilling
  • Photosynthesis
  • Thylakoids
  • Zea mays

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this