The quantum yield for CO2 uptake in C3 and C4 grasses

Russell K. Monson, Robert O. Littlejohn, George J. Williams

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The quantum yield for CO2 uptake was measured in C3 and C4 monocot species from several different grassland habitats. When the quantum yield was measured in the presence of 21% O2 and 340 cm3 m-3 CO2, values were very similar in C3 monocots, C3 dicots, and C4 monocots (0.045-0.056 mole CO2 · mole-1 quanta absorbed). In the presence of 2% O2 and 800 cm3 m-3 CO2, enhancements of the quantum yield values occurred for the C3 plants (both monocots and dicots), but not for C4 monocots. A dependence of the quantum yield on leaf temperature was observed in the C3 grass, Agropyron smithii, but not in the C4 grass, Bouteloua gracilis, in 21% O2 and 340 cm3 m-3 CO2. At leaf temperatures between 22-25°C the quantum yield values were approximately equal in the two species.

Original languageEnglish (US)
Pages (from-to)153-159
Number of pages7
JournalPhotosynthesis Research
Issue number2
StatePublished - Jun 1982


  • C photosynthesis
  • C photosynthesis
  • grasses
  • quantum yield

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology


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