[NAFEX] pear seed germination

Lon J. Rombough lonrom at hevanet.com
Mon May 30 18:44:42 EDT 2005


I've germinated a lot of pome fruit seed of many species and one thing 
I've  noted is that over 90% of the time, when radicals began to show 
on any of the seeds, the rest are ready to sprout as well, and 
generally could be planted without having to stay in stratification.
I also had very good luck stratifying the seed in peat moss as it has 
natural anti-fungal properties that prevented spoilage.  Seeds that DID 
spoil were almost always inviable.
-Lon Rombough

Grapes, writing, consulting, my book, The Grape Grower, at 
http://www.bunchgrapes.com  Winner of the Garden Writers Association 
"Best Talent in Writing" award for 2003.
On May 30, 2005, at 7:06 AM, Luffman, Margie wrote:

Hello. This is the procedure which we have used successfully for 
germinating both apple and pear seeds.



Guidelines for Malus Seed Germination

1)  Wash and disinfect all containers to be used for chilling or
germination and disinfect the working surface on which the seeds are 
handled.

2)  Soak individual seed lots in separate containers, for a minimum of 
24
hours to a maximum of 48 hours in regular tap water.  Start the soak in
the a.m.; Change the water every 2-3 hours to remove any possible growth
inhibitors. You will not need to change water for the overnight
soak.  Label containers with appropriate identification and handle
carefully to avoid misidentification.

3)  Distribute seed evenly on saturated but not dripping wet blotter 
paper
or paper towels, shake off any excess water.  Place germination 
containers
in the dark at 1.5oC (34oF) (regular kitchen refrigerator works fine at
38F to 42F) for a minimum of 90 days.  Check on seeds once a week,
changing paper every two weeks.

4)  As needed, surface disinfect each seed lot in 10% chlorox 
(bleach)for two minutes, followed by a thorough rinse in running tap 
water.  After 60 or
more days, the radicle (white root that starts to emerge from the base 
of
the seed) begins to emerge; then discontinue the use of all surface
disinfectants so as not to burn the root-tip.

5)  Therefore after about 60-110 days of chilling as you see a few of 
the
seeds in each seed lot showing radicles, place seeds at 10oC (50oF) (or
cool room ~ 60oF is fine) for 2-5 days to promote full germination of 
the
seed lot.   If some of the seed still appears viable continue to hold 
the
seed at 10C (50F) until you see radicle emerge and then plant.

6)  When radicles have emerged, carefully plant pre-germinated seed in 
4"
plastic pots with Cornell mix (commercial potting mix).  When planting 
the
seeds with the white radicles, take extra care in not damaging the young
radicle (1st root) tip.  Grow seedling to 6-7 true leaves and transplant
to nursery.


Margie Luffman
Curator/Conservatrice
Canadian Clonal Genebank/Banque canadienne de Clones
Agriculture and Agri-Food Canada/Agriculture et Agroalimentaire Canada
Telephone/Téléphone: 519-738-2251 ext. 474
Facsimile/Télécopieur: 519-738-2929
2585 County Road 20
Harrow, Ontario
N0R 1G0
luffmanm at agr.gc.ca

  Agriculture and Agri-Food Canada - Agriculture et Agroalimentaire 
Canada

-----Original Message-----
From: nafex-bounces at lists.ibiblio.org 
[mailto:nafex-bounces at lists.ibiblio.org] On Behalf Of tanis cuff
Sent: May 29, 2005 7:33 PM
To: nafex at lists.ibiblio.org
Subject: [NAFEX] pear seed germination

Well I have a dozen nice little pear seedlings which made it thru the 
blight
stage, so I can report now.

In past years I had tried several different methods to germinate pear 
seeds.
   I harvest my tree (sorry, cultivar name not known) later than 
recommended
because this pear doesn't keep, even when picked way green.  I figure 
one
advantage is, the seeds inside tree-ripened pears are fully mature.  
But, no
luck on germination.  So, last fall I thought I'd try once more before
giving up.  I wrapped about 50 fresh moist seeds in damp p.towels and 
put
them in a plastic bag, put this bag in a compartment of the 
refrigerator,
and forgot about them.

Discovered this bag of stratified seeds in mid-March.  I'm not normally
shocked by what I find in refrigerators, but this was ugly.  I carefully
picked thru the mold and gently pinch-tested all the seeds.  In about 
half,
the kernel inside was rotted, or there never had been a kernel.  The 
other
half were firm.  Of this sub-set, about half were plump and half seemed 
only
partially filled.  I planted these in separate seedling tray rows, and 
the
plump mostly germinated and the part-filled mostly tried but failed.  
Two of
the strong seedlings died of a seedling stem- or root-blight.

Germination was in a cool room, but in the sun of a south-facing 
window.  I
built a tent of clear plastic loosely over the seedling tray, to 
increase
the r.h. and temperature during the day (loosened further and eventually
removed as all seeds sprouted).  Night temp in the room was cool enough 
I
wondered about aux heating, but didn't get around to it.  Soil was a 
mix of
odds/ends left from last year, not sterile but high in healthy compost.
Water was collected rainwater.

I hope this saga helps others.

Comments, please, from the more successful seed-starters!


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