Re: I. sibirica X I. pseudacorus

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Jim,

using tetraploids will give amphidiploid offspring, which will be fertile. Diploid hybrids often have unbalanced chromosomes and fail to produce viable gametes during meiosis and are thus infertile. The advantage lies in the next generations as most diploid wide-cross hybrids are dead ends. As to whether the actual cross will be easier to make, I doubt it, but one has a better outcome for the extra effort to get the cross to take.Â

-- 
Jamie V.

_______________________

KÃln (Cologne)
Germany
Zone 8 

Now this is all very fascinating information for one who likes to do some hybridizing! Canât wait to give it a try myself. Also, will look forward to seeing this hybrid seedling flower as well.Â

I do have a question regarding the use of the tetraploids â why would this work any better than using both diploids? Also, it is interesting that if siberica and sanguinea are not closely related that the offspring from such a cross as still quite fertile??

Jim in Saskatoon

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From: r*@yahoo.com

Sent: Friday, March 04, 2011 4:12 PM

To: i*@yahoogroups.com

Subject: Re: [iris-species] I. sibirica X I. pseudacorus

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My understanding is that Siberian Irises, as a class, are mostly I. sanguinea. A surprising finding by Dr. Wilson is that I. sanguinea is not very closely related to I. sibirica.

Rod

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From: JamieV. j*@freenet.de
To: i*@yahoogroups.com
Sent: Fri, March 4, 2011 3:54:21 PM
Subject: Re: [iris-species] I. sibirica X I. pseudacorus

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Dennis, et al,

I've tried the cross a few times with no takes, but using tetraploids should most certainly work creating an amphidiploid. There are quite a few tet sibericas to try. Sultan's Ruby comes to mind as being a very reliable garden plant. Dennis, could you send over some of the tetraploid pollen? I have SR and a couple of other tetraploids in the garden. This may be worth a try.

Jamie

Am 04.03.2011 22:47, schrieb Dennis Kramb:

I grow both. I can try it this year (if you remind me!). Actually my clone of pseudacorus is tetraploid, so that could improve chances of a successful cross.

Dennis in Cincy

-- 
Jamie V.

_______________________

KÃln (Cologne)
Germany
Zone 8