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Light-induced absorption changes in etiolated Coleoptiles

  • Susanne Widell
  • Lars Olof Björn
Publishing year: 1976
Language: English
Pages: 305-309
Publication/Series: Physiologia Plantarum
Volume: 36
Issue: 4
Document type: Journal article
Publisher: Wiley Online Library

Abstract english

Blue (or green) light induced reversible and irreversible absorption changes in etiolated wheat (Triticum aestivum) coleoptiles. Immediately after a 10 s pulse of blue light, there was an absorbance increase at 440 nm and a decrease at 420 nm. The absorbance at 440 nm returned to the original level in a biphasic way with 1st-order rate constants of 0.05 s-1 and 0.006 s-1 at C. The change at 440 nm was partly, but not completely, inhibited by iodide. In the 500-600 nm region, complex changes occurred, indicating the participation of at least 2 different cytochromes, one of which was oxidized during a 10 s light pulse and the other oxidized more slowly during the following dark period.


  • Biological Sciences


  • ISSN: 0031-9317
Lars Olof Björn
E-mail: lars_olof [dot] bjorn [at] biol [dot] lu [dot] se

Professor emeritus

Molecular Cell Biology

+46 46 222 72 53