[Trillium-l] GREEN

Jamie Vande 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?

Jamie Vande

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
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