Pigment changes - WHY?
fzyenath at chip.ucdavis.edu
Tue Nov 12 23:32:11 EST 1996
Martin Witchard (Cat) (mwitchar at metz.une.edu.au) wrote:
: When I look at a flower bud as it opens I can get a general idea of the
: colour of the final flower.
: In some cases though the flower ends up being considerably lighter/paler
: once opened or considerably stronger/more intense once opened.
: I'd like to know WHAT 'pigments' are present and WHAT is happening to
: them. In the pink rose are the 'pigments' photodegraded? Is the same
: occurring in the red rose, and if so, why doesn't it become white? Is it
: possible that the Geum 'pigment' actually intensifies with
: Answers please if you have them to offer (a good reference would also be
: appreciated!) :)
Look at a paper by Martha Weiss that came out in American Journal of
Botany, sometime in 1993 or '94. It was an evolutionary perspective on
colour change in a very wide range of angiosperms. She had some
information on underlying mechanisms in some taxa. Sorry I don't have
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