North American Fruit Explorers mailing list at ibiblio

[Michael Dossett <phainopepla@yahoo.com>]

Jerry,
 
They may produce sterile triploid trees, but it would be hard to know until 
you had a 20+ year old tree that still wasn't producing and then you can only 
guess that it isn't just experiencing and extended juvenile phase.
 
I don't know how strong triploid block is in this group but in many taxa, 
interspecific triploids are difficult to produce at anything but very low 
frequencies with controlled crosses because of a genetic mechanism that 
blocks their production.  I would suspect that is more likely that you could 
have production of an unreduced pollen from the diploid pollinate the 
tetraploid and produce viable tetraploid hybrids.  You are much more likely 
to get something happening this way if the diploid parent is the pollen 
parent than if the pollen parent is tetraploid.
 
Michael

Michael Dossett
Mission, British Columbia
www.Mdossettphoto.com
phainopepla@yahoo.com
 

________________________________
 From: "Jwlehman@aol.com" <Jwlehman@aol.com>
To: nafex@lists.ibiblio.org 
Sent: Wednesday, September 11, 2013 5:21 AM
Subject: Re: [nafex] Is my pecan seedling a hican?
  


In a message dated 9/11/2013 7:56:11 A.M. Eastern Daylight Time,  
ehilborn@mebtel.net writes:

Thank  you Lucky, the differences in ploidy among species is reassuring.

I  will plant them out next year in their permanant site and we shall 
have  nuts to evaluate- I guess in about 15 years?

Betsy
On 9/10/2013 2:07  PM, Dr. Lucky Pittman wrote:
> Betsy,
> As Dr. O'Barr indicated,  pecanXhickory hybridization doesn't happened all
> that frequently - and  differences in ploidy *may* preclude some species 
from
>  crossing.   Pecan, shellbark, shagbark are diploid and will  hybridize, 
but
> mockernut is tetraploid(not sure about pignut, but I'm  thinking it's also
> tetraploid), and likely won't cross naturally with  the diploids.
> Most years, hickories are earlier than pecans, so  potential for
> cross-pollenation is slim.



Interesting discussion!

Another thought: An interspecies hybrid involving the tetraploid with the  
diploids would produce triploids. Wouldn't they likely be seedless, that is 
bear  no nuts, certainly produce few nuts? Or shells with undeveloped 
kernels?  

Jerry
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Subject: Re: [nafex] Is my pecan seedling a hican?
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Thanks Lucky! How interesting, I am using my seedlings the same way- in
a riparian buffer. Mine are Kanza x Pawnee.

I did not know however that black walnuts had anaerobic tolerance. I
have been planting mine up out of the flood plain.

Betsy

On 9/11/2013 10:30 AM, Dr. Lucky Pittman wrote:
> Betsy,
> My kids and I transplanted several hundred 2-yr old seedlings of Major &
> Posey (northern pecan), back in 2000, into a 100-ft wide CRP riparian
> bufferstrip that runs the length of the farm - about 7 acres in total.
> Other than once or twice a year mowing, they've received little to no care.
> While mowing last weekend, I noticed that ONE tree has nuts this year.
> So...15-20 years is probably about as soon as you'll see nuts - though with
> some vegetation control and fertilization, you might get there sooner than
> mine did.
> Named-parentage black walnut seedlings, planted in that riparian bufferstrip
> at the same time as the pecan seedlings have been bearing good crops of nuts
> for 5 or 6 years now.
>
> Lucky
>
>