Re: hosta-open DIGEST V1 #12
- Subject: Re: hosta-open DIGEST V1 #12
- From: firstname.lastname@example.org
- Date: Wed, 29 Oct 2003 00:43:18 -0800
>Treating with above-normal levels of plant hormones does seem to
>clearly cause a number of mutations in hosta in tissue culture labs.
High levels of hormones in TC doesn't cause mutations in other plants,
so it is unreasonable to assume they cause mutations in hosta. The
"mutations" we see in hostas is more likely due to transposable
elements and it's not all that difficult to pick them up without doing
TC or using high levels of hormones. Whether or not these are true
mutations as we normally think of mutations is an interesting debate
in semantics. I've made some crosses using Francee sports and didn't
detect any difference from regular Francee, but the sample population
was too small to have any significent meaning. In some hostas you can
pick up small variations that seem to be fairly stable. The question
is how do these variations behave genetically when compared to the
standard for that cultivar. I've been trying to make some crosses
along these lines, but the problem I'm having right now is that hostas
that seem to produce the most variants are also very infertile.
An example of how to do this would be to cross the same hosta to
Patriot and Minuteman and compare the results. In Francee you can
easily see two color forms, one is darker green then the other, but
the difference isn't easily seen unless you are looking for it.
Patriot and Minuteman are the same variation in color as in Francee,
but the difference is more easily seen. Francee will also produce a
very pale green form that is stable, but appears to be a rare sport.
The pale green form appeared to act as a typical green Francee in
crosses, but the fertility is so limited that it's hard to come to any
You can also do this type of cross by using a good form of Great
Expectation and the poor growing form which is easy enough to pick up
and crossing the two forms to something else and comparing the
progenies from the two populations.
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