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Re: yellow color in Hosta


>Ben pointed out to me that yellow sports are not devoid of 
>chlorophyll, but the yellow accessory pigments dominate the color of 
>the leaf.

>Remove most of the chlorophyll and you get yellow, remove both 
>pigments and you get white.

Chloroplast do contain carotene pigments that can give some yellowing 
color ro a leaf.  However, I would suspect that the yellow color in 
most yellow leaved hostas is a late stage precursor to chlorophyll.  
These late stage chlorophyll precursors are yellow colored.  You can 
see this by germinating many seeds in darkness - the cotyledons are 
yellow, not green.  Light is needed to tiger the final synthesis to 
green chrolophyll.  The dominant nature of yellow leaves in hosta 
suggest that this dominant gene is an inhibitor gene of chlorophyll 
synthesis that builds up the yellow precursor.  

Joe Halinar

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