Photobiology pp 531-552 | Cite as

Vitamin D: Photobiological and Ecological Aspects

  • Lars Olof Björn


Vitamin D was discovered as a result of its ability to cure rickets, but recently many other important functions for it in the human body have been discoverred, and it counteracts several other diseases, such as diabetes and some forms of cancer. The nuclear vitamin D receptor has been found throughout the vertebrate phylum down to jawless fishes, but not in invertebrates. Its role in those organisms that are repsonsible for the main input to the aquatic food web and to human nutrition, i.e., phytoplankton and zooplankton, is not understood.This chapter summarizes the discovery of vitamin D and the chemistry and photochemistry of its precursors, transformations, and metabolites. The physiological roles of 1,25-dihydroxyvitamin D are briefly described, as well as evolutionary aspects of the signaling in animals based on this compound. The chapter is concluded with an overview of what is known about the occurrence and role of vitamin D in the plant kingdom, biogeographical aspects of vitamin D, and the relatively recent discovery of nonphotochemical production of vitamin D.


Ultraviolet Radiation Uropygial Gland Labeo Rohita Dark Skin Color Uropygial Secretion 


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