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hardy  Aroids)" <ARISAEMA-L at NIC.SURFNET.NL> Aroids)" <ARISAEMA-L at NIC.SURFNET.NL>
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From: irisman <irisman at AMERITECH.NET>
Subject: Re: Arisaema chromsome numbers
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>From Adam Fikso--Thank you Susanne Renner.  You have confirmed my guess
that there were many possibilities re historic and evolutionary
hybridiztion.  And, looking at the numbers where if 2n=24 is the common=est
genome,   but  there is a 2n=72,-- it is hard for me to ignore the
possibility that the 2n=72 entity may be a hexaploid.      With numbers=as
much higher as you indicate, 140 and 168,  I note that 168/12 = 14.  Wh=at's
the number for a 14-ploid anyway?  I'm not a geneticist, but I note that
ploidy as hnigh as thnis is not chartcteristic of too many pl;ants, is it.
I've ran across it years ago tryhing to jmust keep abreast of theliteratu=re,
and note that som,ereally high ploidy numbers turned up in Scilla Peruvia=na.
I've always had a question regarding this--How many of these are really
needed to produce a plant that's indistinguishable with the naked eye fro=m
one with, say a tenth of the number of chromosomes?   Or is this topic wa=y
too far afield?



----- Original Message -----
From: "Susanne Renner" <Renner at UMSL.EDU>
To: <ARISAEMA-L at NIC.SURFNET.NL>
Sent: Saturday, March 09, 2002 10:53 AM
Subject: Re: Arisaema chromsome numbers


> ((I forgot to change the setting on my computer for my previous message.
I
> had not meant to sign with my full address.))
>
> Anyway, on Arisaema chromosome numbers:  My lab is trying to understand
> chromosome number evolution in Arisaema by comparing the numbers in
closely
> related and distantly related species.  As several contributors to this
> thread have explained, chromosome numbers and hybridization go together.
> From the great diversity of chromosome numbers in Arisamea (and the ver=y
> high numbers, such as n = c.140), it seems that hybridization has pla=yed a
> great role in the past evolution of Arisaema diversity.
>
> Susanne
>
> Dr. Susanne S. Renner
> Professor
> Department of Biology
> University of Missouri-St. Louis
> 8001 Natural Bridge Road
> St. Louis, MO 63121-4499
> or
> The Missouri Botanical Garden
> P.O. Box 266
> St. Louis, MO 63166
> http://www.umsl.edu/~biosrenn/