vine twining

Wed Jun 30 16:21:32 EST 1993

There is a section on circumnutation in one of the articles in Putz &
Holbrook's book "biology of vines".  It doesn't mention any handedness with
regard to twining.  I can't recall ever seeing anything specifically on this.

On a related topic, I've just come up from the greenhouse, and the count of
handedness on my cucumbers, peas, grapes, and other assorted tendril climbers
indicates that a 50/50 split on direction would be the best way to describe
handedness in tendril coiling.  I once tried to relate handedness in tendril
twining with phyllotactic spiral handedness.  The problem is that most vines
are dorsiventral.  Many have a distichous phyllotaxy, not a spiral one.
I also found out that the handedness of branches on the spiral ones could
change with no clear relationship to branch order.  Anyway, it helps to pass
the time.

Jean Gerrath
Department of Horticultural Science
University of Guelph
Guelph, ON  Canada  N1G 2W1
botjean at   or jgerrath at

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