Plant Photoreceptors and Photomorphogenesis
Briggs, Winslow R. .
Plant Photoreceptors and Photomorphogenesis.
The earliest report of blue light’s special effects was by Sabastiani Poggioli in 1817 showing leaf orientation to light was optimal in blue light. Decades later, various workers obtained the same result for phototropism. Workers in the 1860’s first reported blue light effects on chloroplast movement but it was the 1920’s before a special effect of blue light on leaf expansion was first documented and it was not until the 1970’s and early 1980’s that blue light was essential for induction of stomatal opening. The first blue-light receptor, cryptochrome 1, was identified by Ahmad and Cashmore in 1993, and characterization of cryptochrome 2 followed shortly thereafter. In 1998 the photoreceptor known as phototropin 1 was finally characterized by John Christie and co-workers as a photoreceptor for phototropism and identification of phototropin 2 followed shortly. The involvement of the phototropins in chloroplast movements, leaf expansion, and stomatal opening was finally demonstrated in the early 2000’s. The long journey to find “the blue-light receptor” led to discovery of two families of blue-light receptors, the cryptochromes and the phototropins, and identification of a possible third family, the ZTL/ADO F-box proteins, involved in photoperiod measurement and circadian rhythms.
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1 - Carnegie Institution of Washington, Department of Plant Biology
Presentation Type: Symposium or Colloquium Presentation
Location: Boulevard C/Hilton
Date: Monday, July 9th, 2007
Time: 8:00 AM