Digest Number 548
From: Sharon McAllister <73372.1745@compuserve.com>
Message text written by INTERNET:iris-talk@onelist.com
>After all the discussions about TB tets actually being (drat, I am so
bad at terminology) allotetraploids? rather than true tetraploids, and
previous discussions about germanica being sterile, I figured that
germanica might have chromosomes that would match up better with SDBs
than with TBs. Based on growth habits & lack of fertility with TBs. &
intuition.
Sharon, have you got time to figure out why this worked and explain it?
Help me sort out my intuition?<
First, "I. germanica" is generally believed to be an amphidiploid,
relatively infertile -- but there's a distinct difference between "sterile"
and "relatively infertile". I believe that in the case of "I. germanica",
compatible partners simply haven't been found.
The seeds you describe are characteristic of those from wide crosses. If
you culture them [and you should] you may find that some are all endosperm
with no embryo, while some have embryos with inadequate endosperm and
others are perfectly normal.
Sharon McAllister
73372.1745@COMPUSERVE.COM
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