North American Fruit Explorers mailing list at ibiblio

[Michael Dossett <phainopepla@yahoo.com>]

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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Subject: Re: [nafex] nafex self fertile pears?
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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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Subject: Re: [nafex] self fertile pears?
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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.