Re: Hosta Sports, continued...

halinar@open.org wrote:
RE:>>If mitotic recombination were the cause of green edges showing up on yellow hostas then there should only be one type of green edged sport you could get from Abiqua Recluse.  You would also not get an all green sport of Fascination revert back to yellow steaking because, according to Ben such a plant should be homozygous yy.
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Hi Joe and Hosta Scholars, (as Jim Hawes has graciously referred to those choosing to pursue an increased understanding of the origin of Hosta Sports),

From this site http://www.liv.ac.uk/ctibiol/CUBE95/cbavailability-l/msg00008.html, I find an exercise that is part of an introductory genetics course, which I quote;
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Exercise 6. Mapping via Mitotic Recombination - exploiting haploidization and mitotic crossing-over to obtain further mapping data. You are given 9 segregants from a diploid fungus and asked to score them for i) ploidy ii) different auxotrophic and drug resistance markers. The segregants are then analysed for mapping information. A full length 'help' animation on mitotic recombination is included. This topic makes students think about what happens during mitosis and what would happen if a rare recombinational event occurred.
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And from this one, I even find a Flash 4 animation of the phenomena of mitotic recombination.
http://www.mcdb.yale.edu/mcdb210a/MCDB210a_Flash_Stuff/MCDB210aFlashNav.html

Note that there are several animations of biological processes and through these, the authors attempt to graphically depict what might otherwise be quite difficult to describe.   I found this more useful, after having studied some genome information on sequence duplications in A. Thaliana.  These animations useful to describe and define processes of interest to both lay investigators and researchers alike.   Would well watered crowns which are exposed to the sun be better candidates for sporting?  Or, is it mitotic recombination a better explanation of new hybrids than for sports?
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Finally, the number of duplicated segments in the five chromosomes of A. Thaliana is intriguing as we discuss mitotic recombination.  While recombinations in the plastids seems more likely as an explanation for minor sport variations, stable sports seem likely to be resultant from nuclear changes.  Please note that at my level of understanding, I can ONLY employ the SWAG method for stating hypotheses and drawing conclusions.

I'm just curious, Joe, why you are so firmly convinced that mitotic recombinations is NOT be a viable explanation for SOME Hosta sports, particularly for more stable ones like Great Expectations which is a periclinal chimera, if I understand the definitions well.  I don't know why a mitotic recombination fo Abiqua Recluse would only offer one variety of a green edged sport.  Could you help clarify why this must be, particularly if there are multiple genes involved in determining color?

Because I'm not following all of the discussion with 100% attentiveness, please forgive logic flaws that may be introduced by the fact that I could really use a nice, long nap... 

-- 
Andrew Lietzow
#1 Plantsman at http://hostahaven.com
1250 41st St
Des Moines, IA 50311-2516
 
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