North American Fruit Explorers mailing list at ibiblio

[Jwlehman@aol.com]

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
>From lpittman@murraystate.edu  Wed Sep 11 10:14:38 2013
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From: "Dr. Lucky Pittman" <lpittman@murraystate.edu>
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Subject: Re: [nafex] Is my pecan seedling a hican?
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Jerry, 
I'm not familiar enough with plant genetics to make an informed comment. 
Guy Sternberg had identified what he, putatively, was calling a hybrid of
mockernut(tetraploid) and shagbark(diploid) hickories - and I had one here
on the farm that I was thinking might also be such a hybrid, but after
several years of looking at it, I think it's just red hickory, C.ovalis.
Bark looks a lot like mockernut, but the farther up the trunk you look, it
starts exfoliating plates, like shagbark or shellbark.  Nuts are similar to
nearby shagbarks, but brown, instead of white.  Cracks out about like a
poor-quality shagbark, but shell much thinner and less convoluted,
internally, than the typical mockernut.
Fred Blankenship told me that he didn't think - based on discussions with
Larry Grauke - that the tetraploids and diploids would cross, naturally.

Lucky

-----Original Message-----
From: nafex-bounces@lists.ibiblio.org
[mailto:nafex-bounces@lists.ibiblio.org] On Behalf Of Jwlehman@aol.com
Sent: Wednesday, September 11, 2013 7:22 AM
To: nafex@lists.ibiblio.org
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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