re tricots and tetracots

J Preiss--Seq Anal preissj at CLVAX1.CL.MSU.EDU
Fri Feb 12 12:36:00 EST 1993


I have seen the variable cotyledon syndrome quite a bit in tomato, and a 
little in other species.  Charlie Rick did some work to show that most 
multicots is tomato are just environmentally induced, and not heritable.
He can change the frequency of multicots with different growth conditions, 
as I recall, but nothing like an all or nothing response.  Just little 
increments.  Some of the multicots are heritable, however, and are associated
with abberant chromosome numbers.  Some of the tomato trisomics routinely 
have tricots.  These are heritable.  This can be an interesting phenomenon,
but most of my plant anatomy and evolution instructors in college just 
showed me stacks of cases of supposedely definative plant parts changing 
numbers (eg, petal number, leaflet number, ovary number, etc) and said that
plants are just plastic like that.  It was good enough for me then, but I
have always thaught this was an interesting question.  Hope this gives you
some ideas to work with.

	Dr. Leonard N. Bloksberg
	PreissJ at clvax1.cl.msu.edu
	Dept. of Biochemistry
	Michigan State University




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