Photoacoustic signal generation in leaves: are O2-consuming processes involved?

Marc Charland, Konka Veeranjaneyulu, Denis Charlebois, Roger M. Leblanc

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The photoacoustic signal from a green leaf is the vectorial sum of photothermal (heat emitted by non-radiative deexcitation of molecules) and photobaric (photosynthetic O2 exchanges) contributions. With sugar maple leaf, we have observed a decline of the O2 signal in the course of time, once the leaf attained a steady-state photosynthesis. This decline of the O2 signal was not due to a decrease in photochemical activity as was evident by a stable fluorescence signal and constant energy storage. The rate and the extent of decline were larger at low modulation frequency and low modulated light intensity. The decline continued even in the presence of background far-red light (λ>715 nm). The above observations lead us to conclude that the photoacoustic O2 signal from leaves is influenced by O2-consuming processes. Data are discussed in relation to a possible occurrence of an equilibrium between oxygen-evolving and oxygen-consuming processes to account for the O2 signal in the plant cell. Moreover, the oxygen-uptake component may have to be included in the vectorial model of photoacoustic signal generation in leaves.

Original languageEnglish (US)
Pages (from-to)261-265
Number of pages5
JournalBBA - Bioenergetics
Volume1098
Issue number2
DOIs
StatePublished - Jan 16 1992
Externally publishedYes

Keywords

  • (Sugar maple)
  • Oxygen evolution
  • Oxygen uptake process
  • Photoacoustic spectroscopy
  • Photosynthesis

ASJC Scopus subject areas

  • Biophysics

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