Pigment changes - WHY?
Martin Witchard (Cat)
mwitchar at metz.une.edu.au
Wed Nov 13 09:10:53 EST 1996
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.
How is this explained in light of current knowledge of plant 'pigments'?
For example, a deep red rose opens and soon fades (in a day or two) to its
'natural' colour of pink. Or a pink budded rose opens pink then becomes
white in a few days. Or an orange Geum increase its intensity of colour on a
bright, sunny day (this last may be merely perception and not
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
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