Re: [nafex] self fertile pears?

Another possibility is that the rootstock has sent out a shoot from
below the graft union, and started flowering, making a 2 in 1 tree.
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Re: [nafex] nafex self fertile pears?

Can honeybees pollinate self-fertile pears? Tomatoes are seld-fertile but honeybees are unable for the.most part - bumblebees are required. Tomatoes, I understand, have 3 sets of genes and may occasionally revert to a different set.

5 miles for a honeybee is possible, but most gain is lost around 4 miles. They use up almost all they collect. While they instinctually do not over forage too close to home, (wasted trips to over-foraged flowers,) a mile is a preferred maximum, give or take, when possible.

BillSF9c
- near San Francisco, USDA 10a
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Re: [nafex] self fertile pears?

In pears the flowers will produce both male and female parts that are viable - the mechanism is a type of self-incompatibility where the pollen germinates and grows about a third of the way down the style before the RNAs are degraded by enzymes in the style if they contain the same genetic allele as the pollen.  Sometimes this can be overcome by temperatures that allow pollen tube growth to occur more quickly and reach the ovules prior to degradation.  If you are consistently getting fruit set when none existed before then there really are only a couple of possible scenarios. 1. There is pollen from somewhere that you aren't aware of.  Honeybees will travel a long distance.  From my conversations with beekeepers here, I've been told that any pollen source within a radius of ~5 miles can allow pollination (obviously, closer is better).  2. Chimeral mutation (aka bud sport) on a limb somewhere that has allowed different alleles to be produced thereby providing compatible pollen on the same variety of tree.  This isn't completely unheard of but it is somewhat rare.
Michael Michael Dossett Mission, British Columbia www.Mdossettphoto.com phainopepla@yahoo.com

On Wednesday, October 12, 2016 6:33 PM, Jim Fruth <jimfruth@charter.net> wrote:

My pear flowers seem to have both pistle and stamens.

-----Original Message-----
From: Henry
Sent: Wednesday, October 12, 2016 8:17 AM
To: mailing list at ibiblio - Northamerican Allied Fruit Experimenters
Subject: Re: [nafex] self fertile pears?

The purpose of a plant seems to be to reproduce itself.

I have heard that some plants "get frustrated" after years of not producing
seed and "fix" the problem.

We are not allowed to grow the "sterile" forms of the invasive buckthorn
here in Minnesota because they tend to revert to seed production when they
get "old."

Some isolated "female" dioecious plants will grow a branch of "male" flowers
so as to be able to make viable seeds.

I don't know what the pears might be doing to pull this off.

--Henry Fieldseth

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Re: [nafex] self fertile pears?

Keep in mind that ornamental callery pears have become an invasive species recently, so they might be providing pollen to these edible pears.

Melissa
Decatur, GA
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Re: [nafex] self fertile pears?

Had I suspected there might have been a controversy over this subject, I would have saved some of the seed from my tree to test. There are some in the mulch pile so I'll see how many grow next Spring, assuming they are not buried too deeply. Otherwise I'll have to perform the seed tests in 2018.

-----Original Message-----
From: Alan Haigh
Sent: Wednesday, October 12, 2016 4:47 AM
To: nafex@lists.ibiblio.org
Subject: [nafex] self fertile pears?

"Apparently I should have mentioned...................The isolated pear
tree out in the countryside produces viable seed."

So so you believe the tree to be self fertile? That is something I've not
heard of but I certainly consider it possible. When isolated pear trees
have born fruit here, I never have even checked their seeds so I really am
only speaking from the literature.
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Re: [nafex] self fertile pears?

My pear flowers seem to have both pistle and stamens.


-----Original Message-----
From: Henry
Sent: Wednesday, October 12, 2016 8:17 AM
To: mailing list at ibiblio - Northamerican Allied Fruit Experimenters
Subject: Re: [nafex] self fertile pears?

The purpose of a plant seems to be to reproduce itself.

I have heard that some plants "get frustrated" after years of not producing
seed and "fix" the problem.

We are not allowed to grow the "sterile" forms of the invasive buckthorn
here in Minnesota because they tend to revert to seed production when they
get "old."

Some isolated "female" dioecious plants will grow a branch of "male" flowers
so as to be able to make viable seeds.

I don't know what the pears might be doing to pull this off.

--Henry Fieldseth

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Re: [nafex] self fertile pears?

The purpose of a plant seems to be to reproduce itself.

I have heard that some plants "get frustrated" after years of not producing seed and "fix" the problem.

We are not allowed to grow the "sterile" forms of the invasive buckthorn here in Minnesota because they tend to revert to seed production when they get "old."

Some isolated "female" dioecious plants will grow a branch of "male" flowers so as to be able to make viable seeds.

I don't know what the pears might be doing to pull this off.

--Henry Fieldseth

--------------------------------------------
On Wed, 10/12/16, Alan Haigh <alandhaigh@gmail.com> wrote:

Subject: [nafex] self fertile pears?
To: nafex@lists.ibiblio.org
Date: Wednesday, October 12, 2016, 4:47 AM

"Apparently I should have
mentioned...................The isolated pear
tree out in the countryside produces viable seed."

So so you believe the tree to be self fertile?  That is
something I've not
heard of but I certainly consider it possible.  When
isolated pear trees
have born fruit here, I never have even checked their seeds
so I really am
only speaking from the literature.
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