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Re: Pollen Parent


Traveler200000@aol.com wrote:
Good morning, Jim.

As you know, there has been great discussion on this subject and that of Hosta Sports here on the Hosta-open for several months now.  I am going to attempt to field this question, but not from the perspective of one who KNOWS, but from the perspective of one who kind of knows enough to get parts of it right.   That would be like running an idea up the flagpole to see who salutes and who fires at will. :-)

Many researchers and investigators (Benedict, Dermen, Hawes, Marcotriagiano, Vaughn, Zonneveld) have concluded that the maternal parent offers to the sexual propagation of Hosta, DNA from Chloroplasts and Mitochrondria, but that both parents offer nuclear DNA, in typical sexual propagation.  This appears to explain rather well the reason that maternal inheritance is the method for transmission of genes that affect (most?) coloration in Hosta, since the vast majority of the genes that influence coloration are owned by the plastid organelles that provide pigmentation variance to leaves.

RE:>> Would any of you good Ladies and Gentlemen care to go into detail as to what the pollen parent brings to the sporting process, that we have been
discussing?

I asked this question of Ben Z. recently, but do not believe he responded.  I was simply wanting to get a better feel for whether the pollen parent could EVER be a contributor of more DNA than what is in the nucleus.  I have since discovered that there are Haploid plants that actually can be vegetatively propagated (perhaps NOT in Hosta), which raised the interesting questions as to whether their could be propagation that occurs without inclusion of Chloroplast and Mitochrondria DNA but that, through transcription and translation the Chroloplasts and Mitochondria DNA would be built.   Many of us are investigating these phonemena further but, of course, from different perspectives.

I would like to conduct a PCR (Polymerase Chain Reaction) test of a plant like Blue Angel with its sport, White Angel or some such similiar parent/mutant combination to determine whether there is anything different between the genome of these two plants, among other things.  This as part of my further investigation into whether transposable elements play a role in the creation of Hosta Sports, perhaps more so than mutation.

From my investigation, the pollen parent appears to contribute phenotype that is NOT related to coloration but IS related to morphology (when I am believing Jim Hawes position on the matter).  However, when I am believing Ben Zonneveld, then I draw the conclusion that SOME coloration CAN come from the pollen parent, otherwise how could you explain the 50% yield on the GG, YY cross?  Let me say that, and ask that question again.... IF the pollen parent contributes NO Cholorplast DNA, but only contributes nuclear DNA, then what explains the prodgeny inheriting coloration traits of the pollen parent?   Ben may wish to comment in order for us to better understand his mitotic recombinatoin hypothesis.  Haven't seen him hear for a while.

RE:>>What are the roles of pod and pollen in petiole and scape coloring, leaf vein and leaf color

I believe that when you select your pods for gathering seeds, the pods that evidence striping on a scape that also evidences striping will have a much higher probability of producing plants with streaking.  This from Mary Chastain, and others on this forum.

Finally, I've arrived at a price of $15.00/plant for testing of ploidy in Hosta Cultivar samples and expect to be taking a few batches to the lab over the summer, with the first batch going in the later part of April.  Anyone interested in having a plant's ploidy level checked may find this a reasonable pricing point and should contact me personally to discuss methods for sending in a leaf sample.
 
--  
Andrew Lietzow
#1 Plantsman at http://hostahaven.com
1250 41st St
Des Moines, IA 50311-2516
 





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