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Re: LA cross question

Sandy
No direct experience with Louisiana's. However, I would note this is not uncommon in intergeneric and interspecific crosses.
 
Have seen it many times in maize breeding with both interspecifics and inbred material.
 
A parallel experience. Last summer I crossed I.Typhifolia and I. lactea in reciprocal fashion. When both were used as pod parent there were chlorophyl mutants that germed before Christmas and died before reaching 1 inch tall. There was an additional class that germed slower than normal and chlorophyl deficient classes, grew to about a half inch tall, and eventually withered away while still green. It appears that the physiological machinery in wide crosses is variable, plant to plant, in ability to function.
 
Since wide cross chromosomes do not always pair perfectly in meiosis one suspects that is a cause. My theory here is: unbalanced gene distribution to offspring is making a broad spectrum of new forms with widely varying genetic combinations and abilities to adapt. This is why the selection environment is absolutely crucial in evaluating inter-specifics. See Edgar Andersons paper/s of the 1940's ? on this subject with LOUISIANA iris. If memory serves correctly, the title of his book was "Introgressive Hybridization" or something very close to that. Most good libraries have or can get the book by loan. It's worth its weight in gold to the adventurous breeder. I have reread it two or three times and keep going back for more. It is a classic on this subject.
 
I would not expect chemical injury to be a factor in the case you describe. Generally chemical injury results in prevention of seed set, not seedling developmental issues a year later. Its not impossible, just improbable.
 
Good luck with your interspecifics.
 
irisman646
 
 
----- Original Message -----
From: r*@rogers.com
To: i*@yahoogroups.com
Sent: Saturday, March 10, 2007 10:50 AM
Subject: [iris-species] LA cross question

Unlike those who have experienced their first bloommmm (yes Denis, I'm jealous), I'm looking farther afield (so to speak). 
 
I made several crosses with Louisiana irises last year involving a 'dwarf' I. fulva and more modern hybrids (the names of which escapes me, but came with a 2005 Aitken's order). 
 
I had no expectations.  Of ten crosses, I got two takes.  One pod gave three seeds and the second pod over thirty.
 
The first pod has had no germination thus far, the second pod has ten.  I'll be keeping them going for two years.
 
Here is the item for I would like input.  Of the ten that have germinated, only two have chlorophyll.  The only chemical I have used in the garden over the last five years has been Cygon, so the results are not associated with mutagens (as far as I'm concerned anyway).
 
Has anyone had similar results with LA crosses? 
 
(Denis, could you ask the LA forum for me; I'm having trouble subscribing)
 
 
Regards,
 
Sandy Ives in Ottawa (who has seen I. reticulata in his garden on March 15th... just not this year)
 

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