vande.jamie at googlemail.com
Wed May 11 08:35:45 CEST 2011
I agree with you, this is a fundamental change, or as everyone love to
call it these days, a paradigm shift!, in the funtionality of the petal
from petal to leaf biology.. Chlorophyll can mask pigments to an
extent, but, in the case of a white petal, it is generally simply not
present. No pigment needs to mask it. In carotene pigmented flowers,
the chlorophyll (chloroplast) is changed to/replaced by the carotene
pigment (chromoplast), no masking involved.
The starch component is interesting and may be key to the developement
of a white flower, I really have no idea. Although I have yet to check
for pigments in grandiflorum, it does become pink as it wilts, which
would point to an anthocyanin pigment either changing from a white,
possibly due to a flavone combination changing, to a simple pink.
Lilies do have a white pigment, which is why they are so white, compared
to most 'white' flowers, which are actually pale cream. They do aquire
a bit of colour as they pass their peak. maybe a similar situation.
All food for thought....what was the question?
Am 11.05.2011 02:26, schrieb Fern Hill:
> In bud sections I've made of something called (at one time) T. erectum
> 'alba' there was clearly green pigment in the leaves and sepals, but none in
> the petals. By contrast the petals had loads of starch , the sepals a
> little and the leaves none. On this slim observational base, I suspect
> that green petal color represents a change to a leaf-like condition rather
> than supression of other pigment formation.
> John Gyer Clarksboro NJ USA
> Trillium-l mailing list
> Trillium-l at science.uu.nl
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