Photoacoustic Studies of Bundle Sheath Cell Photosynthesis in Zea mays

R. Popovic, Roger Leblanc, M. Beauregard

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Monitoring the photoacoustic signal from 400 to 750 nm provided new data on the energy storage spectra in bundle sheath chloroplasts. For this spectrum we found the following: the energy storage in bundle sheath chloroplasts was stimulated in the presence of 10 mM ascorbate or 4 mM ribose-5- phosphate, but it was diminished after the addition of 10 µM 3-(3′,4′-dichlorphenyl)-1, 1′-dimethylurea; the concentration of 20 µM dibromothymoquinone inhibited energy storage; the oxidized chloroplast electron transport carriers, introduced by the addition of methyl viologen to bundle sheath cells, inhibited the energy storage process; and the effect of malate was similar to that seen for methyl viologen. Our study confirms that PSII in bundle sheath cell chloroplasts is in a partially active state, while PSI is reduced with some endogen electron donor(s). The postulated electron donor(s) of PSI is (are) probably replacing low PSII activity in bundle sheat cell chloroplasts. Malate is inducing the oxidation of electron carriers in bundle sheath chloroplasts.

Original languageEnglish (US)
Pages (from-to)94-97
Number of pages4
JournalJournal of Plant Physiology
Volume132
Issue number1
DOIs
StatePublished - 1988
Externally publishedYes

Keywords

  • 3-(3′,4′-dichlorophenyl)-1,1′-dimethylurea
  • BS
  • bundle sheath
  • C plants
  • chl
  • chlorophyll
  • DBMIB
  • DCMU
  • dibromothymoquinone
  • Electron transport
  • methyl viologen
  • MV
  • photoacoustic spectroscopy
  • Photosystem I
  • Photosystem II
  • plastoquinone
  • PQ
  • PSI
  • PSII
  • R5P
  • ribose-5-phosphate

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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