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  Re: [Aroid-l] Blanching Query
From: Steve Marak samarak at gizmoworks.com> on 2006.06.30 at 06:50:08(14379)
I'm pretty sure I've read that one of the fascinating adaptations of plants is
the repositioning of chloroplasts within the cells to adjust to different light

I seem to remember that this works both ways - in low light conditions, they
will be positioned to maximize light absorption, and in in very high light
conditions, the sort that can cause leaf damage (in the same way that it can
damage human skin cells), they're arranged to reduce absorption.

What I haven't seen is anything specifically connecting this up with the
adaptation process Ken mentions, but I've always thought it made sense both
ways. If you adjust the light levels gradually, there's time for such a
mechanism to work; if the change is too abrupt, it may be more economical for
the plant to cut its losses, ditch the poorly adapted/damaged leaf, and produce
another which is better suited for that light level. But that's me speculating.

I read this long ago, before there was much of a web. Probably there's lots of
information on it out there now (if I'm more or less on track, that is).


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