Re: CULT: TB: selection pressure
- Subject: Re: CULT: TB: selection pressure
- From: L* M*
- Date: Sun, 29 Jul 2001 15:45:27 -0400
Janet in Denmark, WI USDA zone 4:
<While digging a group of TB iris last week, I noticed how much more
deep purple coloring there was at the base of the leaves than the last
time I dug them, 3 years ago. ...... Has there ever been any discussion
on this list about regional differences <within> a particular variety
brought about by personal preferences when it comes to selecting
rhizomes to replant?>
A couple of examples have been discussed - the most controversial having
to do with <all my irises had xx colored flowers last year and now they
are all yy>. But there are examples of flower color sports of various
kinds - I. variegata, HONORABILE, or Brown's Mut (?), I think, where
sports with all yellow blooms (for example) show up. Mike Lowe's
worldiris web page may have something about it, or try searching the
archives for <mutation> or <sport> if nobody else chimes in.
Probably more relvant is the behavior of variegated foliage in some
cultivars, which I think I remember reading occasionally have 'normal'
looking increase. I don't know if variegation shows up in greater &
lesser amounts in most plants with variegated foliage or if it's an
<either/or> thing (i.e., either all variegated in the same
amount/pattern or no variegation).
The purple on the foliage bases is definitely different from one year to
the next depending on stuff (mostly weather?) and also within a growing
season, being most conspicuous early.
When we first discussed purple based foliage (pbf), there were a number
of posts from different regions reporting big differences in amount of
coloring on the same cultivars. I think we decided those differences
were due to what part of the growing season the different regions were
in as well as other 'stuff' (climate), but who knows...
I've always wondered if there might be similar selection pressure for
different regions growing the same cultivar for many generations that
might result in slightly better adapted 'strains' of the same
clone/cultivar. Does a start of RAMESES that has been growing in great
grandma's back yard in Tennessee for 50+ years respond to weather the
same way a start of RAMESES growing in great grandma's back yard in
coastal California for 50+ years? Who knows...
Linda Mann east Tennessee USA zone 7/8
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