RE: [APD] Re: Closing up for the night - or Nyctinasty

[Phil Bunch <pbunch at cox_net>]

I did a little web surfing on nyctinasty. Looks like the mechanism has been 
shown to be light related. It appears that the function performed may 
differ from species to species. There's a fair amount on the how but not 
much on the why. Very little on aquatic plants.

Phil Bunch

On Tuesday, September 30, 2003 00:38, Terry G. Stambaugh 
[SMTP:tgs1 at rni_net] wrote:
> >. That is called Nyctinasty ( a rythmic diurnal movement).
>
>
> Interesting.  What triggers this cycle if it's not light?   I know that 
in animals various glands or parts of the brain control these rhythms.  A 
couple weeks ago, I heard an NPR story that told of recent discoveries in 
animals that in addition to these, each organ has its own 'clock', though 
they didn't go into what controls it, or even what that 'clock' is.  I 
assume there must be some biochemical change in the plant that causes the 
leaves to fold up - do we even know what triggers it or what the actual 
chemical change is?
>
> Next time I hear a plant described as a 'primitive' form of life, I'll 
think twice :-)
>
> Terry in Arizona
>
>
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