Re: [aroid-l] Dormancy question.

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• Subject: Re: [aroid-l] Dormancy question.
• From: &* M* <m*@email.smith.edu>
• Date: Mon, 03 May 2004 15:27:40 -0400
• Content-disposition: inline

Not sure on Amorphophallus specifically but many of the plants that have
had dormancy research done on them control it with the hormone abscissic
acid (ABA). As ABA levels elevate the plant goes into dormancy. This can
be caused by cold and short days for temperate zone plants or extended
drought for wet/dry plants. Eventually the ABA levels drop and the GA
levels rise (another hormone) and "buds break". Lots of these studies,
especially the earlier ones are indirect, that is the observations are
made after the exogeneous application of synthetic hormone rather than
measuring natural homrone in situ, but with improved chemical analysis,
it appears that early studies will hold up.

_______________________________

Michael Marcotrigiano, Ph.D
Director of the Botanic Garden and Professor of Biological Sciences
Smith College
Lyman Conservatory, 15 College Lane
Northampton, MA 01063
email: mmarcotr@smith.edu
voice: 413-585-2741; fax: 413-585-2744
www.smith.edu/garden
www.science.smith.edu/~mmarcotr
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"Art is the unceasing effort to compete with 
     the beauty of flowers and never succeeding."
          Marc Chagall

>>> neil@ng23.abelgratis.co.uk 05/03/04 02:42PM >>>
What is it that actually brings Amorphophallus out of dormancy?

Do they have an internal clock that says '......................NOW!'
Or is it dependent on heat and water levels, or something else 
completely!

Just wondering!

Neil

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