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Re: Re: classifying as a Rebloomer
iris@hort.net
  • Subject: Re: Re: classifying as a Rebloomer
  • From: Chuck Chapman <db4f61431@rewrite.hort.net>
  • Date: Mon, 6 Oct 2014 20:59:13 -0400

The partner, or opposite of facilitative vernalization is the Obligate vernalization. Which means that it has to have vernalization before bloom. All of the iris that don't rebloom in zones 8/9 would be obligate vernaliztion plants. The role of the vernalization genes have ben done with Arabidopsis ( fruit fly of plants for genetic studies) and in comparing winter wheat (needs vernalization) versus spring wheat which doesn't. Also there is a facilitative vernalization form of wheat. From all this it was found that there are variations in vernalization genes, alleles differences. Some of these forms can be dominant over the others. So in FV type of iris there is a vernaliztion gene that is dominant over the obligate vernalization gene.

Iris aphylla and apparently a few odd iris species, have a day-length induce dormancy that includes leaf dropping off. This type of control of fall blooming is an alternative to vernalization , so these plants don't need vernalization genes. So when you get the vernalation gene from aphylla without the recessive day length dormancy you can get rebloom of the fall cyclic type.

So we have a few vernalization genes floating around. These are completely independent of the minor (relatively) variations in bud set temperature variation genes.

Still working on clarifying what is likely bio-active pathways controlling the other rebloomers.

Chuck Chapman


-----Original Message-----
From: Linda Mann <101l@rewrite.hort.net>
To: iris <iris@hort.net>
Sent: Mon, Oct 6, 2014 7:00 pm
Subject: Re: [iris] Re: classifying as a Rebloomer

Interacting genes and suites of genes that travel together, especially
for these upper/lower/duration of temperature genes.

Could it be that Forever Blue has the same broken (rebloom) genes as the CA type, but just grow to maturity so much faster that the intervals are
much much shorter?  Plus possibly some upper and lower optimal
temperature threshold differences.

Where did you get the 5 months needed after bud set?

Seems like my seedlings have a pretty wide range of growth rates.  I
don't mean rate of producing new increases, but rate of increase in size
of leaf blades, production of new leaf blades.  Be fun to see
comparative time lapse photos of fan growth for different genetic mixes.

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