Jensen, Douglas Paige jensendp at
Tue Oct 27 10:04:28 EST 1998

Hmm, this brings up a question for me.  I use anthocyanin 
production as an example of phenotypic plasticity in class. 
My story is that anthocyanins protect from excessive 
sunlight, particularly in plants that are exposed to more 
sunlight than they usually receive (e.g. understory plants 
where a forest gap forms).  My thoughts are that either 
this decreases photorespiration, damage from too many UV 
rays, and helps avoid overheating.  I consider my own 
hypothesis, although I could have picked it up somewhere 
else.  Does anyone have information or studies that support 
or refute these ideas?


On 26 Oct 1998 21:17:07 GMT TFylan <tfylan at> wrote:

> Any useful products a re passed into the stem before abcission Dead leaves are
> brown so anthoocyanins have all either been used up to help make the abcission
> layer or have been translocated back into the stem before abcission layer
> iscomplete Anthocyanins are sugars which are easily transported Rose bushes
> have stems tinged with red especially in spring when sugars are being
> transported and it is usually a sign of health . red Beeches have anthocyanin
> in their leaves which masks the colours of chlorophyll but obviously does not
> affect photosynthesis. Waste products are passedinto the leaves before leaf
> fall Anthocyanins are not waste products 

Douglas P. Jensen
Department of Biology
MSC 7801
James Madison University
Harrisonburg  VA  22807
phone: (540)568-3343
jensendp at

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