posting the results of your study of Sauromatum venosum. Since we
introduced S. ‘Indian Giant’ we have grown out several hundred crosses
between S. ‘Indian Giant’ and typical S. venosum. The resulting plants
are intermediate between both parents with an amazing amount of
variability including some plants with no spots on the petiole, and
others with an abundance of spots. Also, there is quite a bit of
difference with leaf size and leaf ruffling.
Plant Delights Nursery @
Juniper Level Botanic Garden
9241 Sauls Road
North Carolina 27603 USA
Minimum Winter Temps 0-5
Maximum Summer Temps 95-105F
USDA Hardiness Zone 7b
phone 919 772-4794
fax 919 772-4752
"I consider every
plant hardy until I have killed it myself...at least three times" -
[mailto:firstname.lastname@example.org] On Behalf Of StroWi@t-online.de
Sent: Friday, January 21, 2011 9:07
To: Discussion of aroids
'Indian Giant' ploidylevel [was:Re: Sauromatum x Pinellia
> Date: Wed, 07 Jul 2010 21:03:55 +0200
Subject: Re: [Aroid-l] Sauromatum x Pinellia hybrid.... and others...
> From: James Waddick <email@example.com>
> In this same
discussion, the cv "Indian Giant' is brought to
This is a much larger form of S. venosum. Could it be a
tetraploid? Has anyone compared chromosome numbers to the typical,
> smaller form? And is this, by the way, any more or less hardier
> the typical form?
Dear Jim W.,
already more than one year
ago I compared the ploidy level of a normal form of Typhonium venosum (a
genotype/tuber that came from Laos) with my 'Indian
Giant' clone that was originally introduced by Tony Avent (Plant Delights Nursery).
Furthermore I have the clone that was given to me as T. nubicum. but is
probably identical with 'Indian Giant'.
pictures see: (scroll down to the post from 06.11.2009)
I did not count the
chromosomes but used flowcytometry to compare the DNA content.
In short words with this
method the DNA content of nuclei is measured after the DNA was
The measured values are
shown in a graph.
The first peak represents
the cells in the G1-phase; this would give the DNA-content of somatic
cells. The second peak represents the nucelar DNA content of cell in the
G2-phase after the replication of the DNA before the cell devides.
The graphs show the
measurements of T. venosum 'Laos', T.venosum 'Indian
Giant' and T. nubicum, respectively.
strongly indicate that the three clones do not differ in DNA content and
therefore have the same ploidy level.
However, I did no chomosome counts, but if 'Indian Giant'
would be a tetraploid of the normal form of T. venosum, the graph should
show a first peak at channel 100 for the G1-nuclei and a second at
channel 200 for the G2-nulei. This is not the case; all three clones
have the peaks roughly at channel 50 and channel 100.