Ploidy and Fertility

J.E. Shields
Wed, 12 Dec 2007 13:49:56 PST
Hi Hans-Werner,

Thanks for the information.  H. aulicum and H. papilio are both usually 
diploids, but I think there are some triploid forms of aulicum.  I have one 
clone of aulicum that has never set seeds on or by anything; I suspect it 
might be a triploid.

I have heard that Hippeastrum x-johnsonii is found as diploid (2n = 22), 
triploid (2N = 33), and tetraploid (2N = 44) clones.  I wonder if there 
could be some apomixis going on where self-seeds are produced?

I have a bulb from the cross [papilio X pardinum] that has never set seed 
for me.  Years ago, I made the cross [lapacense X nelsonii] and got several 
seedlings that bloomed, but they would never set any seeds.  As far as I 
know, lapacense, nelsonii, papilio, and pardinum are all diploids.

Next time you get some seeds from a complex Hippeastrum hybrid of the 
species, please send them to Dell Sherk for the PBS BX/SX.

Best regards,
Jim Shields
in central Indiana (USA)

At 08:58 PM 12/12/2007 +0000, you wrote:

>I crossed H.aulicum v.robustum with H.papilio (the common evergreen clone 
>which is traded at least in Europe)

Jim Shields             USDA Zone 5             Shields Gardens, Ltd.
P.O. Box 92              WWW:
Westfield, Indiana 46074, USA
Tel. ++1-317-867-3344     or      toll-free 1-866-449-3344 in USA

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