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Re: CalSibe fertile tetraploids

  • To: Multiple recipients of list <iris-l@rt66.com>
  • Subject: Re: CalSibe fertile tetraploids
  • From: "Jeff and Carolyn Walters" <cwalters@digitalpla.net>
  • Date: Thu, 19 Feb 1998 08:10:14 -0700 (MST)

Bill,

Here is a direct quotation from Currier McEwen's "The Siberian Iris":

"In 1976 Tomas Tamberg of Berlin, Germany treated sterile diploid seedlings
from a cross of his 40 chromosome Siberian iris 'Berliner Riesen' by Iris
fernaldi of the series Californicae with colchicine. Three seedlings were
converted to the polyploid state and proved fertile when crossed with each
other (Tamberg, 1990). . . Tamberg has continued this line of breeding with
fertile Calsibe seedlings, and many beautiful flowers of this type have
been achieved (Plate 35). The tetraploid Calsibes are fertile with each
other, producing fetile tetraploid seedlings. They also backcross
successfully with 40 chromosome Siberians and with tetraploid Californicae,
but the resulting seedlings are sterile . . ."

(The citiation in the text above is to Tamberg, T. 1990. Approaches to
hybridizing. British Iris Society 1990 Yearbook: 77-82).

Jeff Walters in northern Utah  (USDA Zone 4, Sunset Zone 2)
cwalters@digitalpla.net


----------
> From: Bill Shear <BILLS@hsc.edu>
> To: Multiple recipients of list <iris-l@rt66.com>
> Subject: Re:  CalSibe sources
> Date: Thursday, February 19, 1998 7:42 AM
> 
> >"Tomas Tamberg is working with polyploid state and it has proved
fertile.
> > Calsibes are fertile/each other, producing fertile tetraploid
seedlings. But
> >Tamberg has very ratrely obtained a viable seed from such crosses but
> >seedlings grow vigorously but sterile."
> 
> Huh? Say again?
> 
> Bill Shear
> Department of Biology
> Hampden-Sydney College
> Hampden-Sydney VA 23943
> (804)223-6172
> FAX (804)223-6374
> email<bills@hsc.edu>





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