Re: HYB: Germination
Paul, that sounds really interesting.
The more I mess with the refrigeration and natural cold cycling of seeds
trying to "push" germination, the more complicated it seems. Like you
say, one thing is clear - no one treatment works for everything. Some
crosses seem to need much longer vernalization than others, some need
two separate cycles, and I haven't had the patience to track those 'two
winter' types closely enough to tell if they have needed long cycles
(two separate 3 month vernalization periods with hot dry conditions in
between) or if short ones would work just as well).
Another thing I <think> I have learned this winter is that some (all?
most?) late bloomers don't germinate until soil temperatures are much
warmer (or warm for a longer time period?) than earlier bloomers. That
hypothesis is based on seeds from three late blooming parents, none of
which germinated until night time temperatures were in the mid 60s F and
daytime highs near 70. I've heard that optimum germination temperature
for TBs is between 50 and 60oF, and for most of my crosses that has been
true. But not for these late ones.
Then there was that one seedling that germinated in July....
I'm surprised at your comment about IMMORTALITY being one that doesn't
require a long vernalization period. For most of the crosses I've made
with it, 8 weeks gave little immediate germination - 12 weeks was <much>
better. And keeping them at temperatures that continued to cycle down
to 40o at night resulted in a few more seedlings coming up.
Then there are those crosses that just have poor germination no matter
what I do - never am sure if those just didn't have the right conditions
in the pod to be healthy seeds or if it was something I did to them or
if they just aren't a good genetic match. I got a note offlist that
LADY FRIEND is one of those parents that just doesn't give good
germination unless with the right partner.
Betty, I agree with you 100% on the need to make <sure> germinating
seedlings have plenty of moisture. I'm convinced I lost a lot of
seedlings when I was germinating them outdoors before I retired. Just
wasn't taking care of them.
<I had posted earlier a few weeks ago that I had some seeds from a
particular cross germinate at 6 weeks after being stored in the
refrigerator for a year. However, this iss apparently only occuring for
this one cross and not the others and once all my germination data comes
in I'm probably going to propose a theory that the early germination for
this particular cross (and other crosses such as with 'Immortality') is
genetically controlled. But really aren't they all? The norm is really
just 12 weeks, some 8, and now I might have a line that is at 6 weeks.
I have a plan to study the factors of dry storage and immediate
germination after vernalization this next year after I obtain enough
seed from these particular lines of plants.>
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