Re: Re: CAT: Sutton's On-line

Patrick--about "shelved" and "non-shelved"  I believe Bill Burleson has some photos that show what is meant better than a purely verbal description.  I'll try anyway.
 
Several folks have alerted some of the SAGE project participants that the way to spot non-SA parents that will yield the highest percentages of SA offspring is to watch for a beard structure that occurs on a ridge, often ending in the little sailing-yacht structure that shows on Advance Guard.  The HIPS photo of Advance Guard in "Quick Fix" has an insert that can be accessed by clicking on the arrow point in the photo.  The link takes one to a closeup photo of the "sail" structure.
 
I've noted that same structure on a number of TB's over the years, and also have seen some beards that seemed to ride high--like the variety started out to be a crested iris and changed its mind in the last minute.
 
Others have the hairs of the beard spread out over a wider space than the above, and emerge from the fall surface with no suggestion of a ridge under the beard.  The base of the beard is simply flat on the fall.  That's "non-shelved."
 
This is a lot easier to grasp with a photo than from just words--at least for me.
 
I hope this is at least a little bit helpful.  Some have used the term "ledge" instead of "shelf" to mean the same thing, by the way.
 
The presence of the characteristic I am trying to describe may represent a low-dosage level of some essential part of the genetics required to have an iris display SA traits. I suspect you are right as to temperature being the critical difference.
 
Also it has been noted that soil pH makes a difference in whether and how SA characteristics are displayed.  In order to get at the genetic elements we need to try to level out as many of the variables affecting SA inheritance as possible.  We may be trying to do the impossible if there are too many loose variables involved.
 
Neil Mogensen   z 7 western NC

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