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True color of leaves

Xun Lu xunlu at vub.ac.be
Fri Apr 14 14:19:59 EST 1995


Harald Teicher (hteicher at biobase.dk) wrote:
: David Mauzerall (mauzera at ROCKVAX.ROCKEFELLER.EDU) wrote:
: : Dear Ray: Leaves are colored by the pigments they contain. They are bluish 
: : from the chlorophyll and yellowish from the carotenoids, resuling in the 
: : usual green. If the carotenoids predominate they can be reddish or purplish. 
: : In the fall, the chlorophyll goes before the carotenoids, exposing their colors 
: : alone. The carotenoids can also oxidize (as does the chlorophyll) to give some 
: : of the deeper colors of someleaves such as maples. The radio man was confusing 
: : chlorophyll and photosynthesis.

: according to paper chromatographic and spectroscopic studies i have done as an
: undergrad, chlorophyl seperates from  other plant pigments on the 
: chromatograph as two *green* bands (chl a and chl b), while the caroteinoids
: separate as yellow or orange bands. spectroscopic data reveal that chlorophyl
: does not absorb (ie relects) *green* light. either i am colour-blind, or i
: have missed something important, so if you have any evidence for *blue*
: chlorophyl i would be very interested in hearing about it.

: thank you for your time

: harry



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