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["Lon J. Rombough" <lonrom@hevanet.com>]

I read up on the Russian methods years ago.  "Mentoring" usually meant grafting the male parent on the female tree, or vice versa.  In this case, it probably means they used the female parent as rootstock for the male, the male parent as rootstock for the female, then made the cross that way.   Supposedly, the female parent as rootstock would have affected the male on it so that the pollen would be more biochemically compatible.  At the same time, grafting the female parent on the species being used as the male would make the female more receptive to that species' pollen.   That way, the pollen from the treated male would be more likely to be able to fertilize the treated female.  
Or, Virginiana on kaki used to pollinate a kaki grafted on virginiana.
-Lon Rombough
Grapes, writing, consulting, my book, The Grape Grower, at http://www.bunchgrapes.com  Winner of the Garden Writers Association "Best Talent in Writing" award for 2003. 
For even more grape lessons, go to  http://www.grapeschool.com
For all other things grape,   http://www.vitisearch.com

On Dec 12, 2007, at 2:35 PM, Jwlehman@aol.com wrote:

 It was written in Russian at the Yalta station where Rosseyanka was bred, it was achieved by "Many years double Mentor."  When I asked what that meant they didn't know and the author had died years before. Also it was recorded as Rosseyanka 18 giving me the idea there were several hybrids were achieved but #18 was the best. I've not been able to confirm that either.   

 One method used to hybridize difficult species is doubling the chromosomes using colchicine. If increasing the sets of chromosome to 4 makes it easier, why don't persimmon hybridize very easily as they have 3 sets of chromosomes?  Go figure!

 Jerry 



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