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1. Comment to Dr. Tsunewaki's proposal on symbol designations (ref.
WIS 73: 59)
1. If we use the plasmon donor's genome symbol to start the
genome symbol, such as BAD for T. aestivum, we can recognize
that it has the B plasmon.
2. Need the footnotes for the "Code".
3.Genome for Ae. juvenalis should be DMU, not DMJ.
Received in March 3,1992 from:
Dr. Richard Wang
USDA-Agricultural Research Service
Forage and Range Research Laboratory
Utah State University
Logan,UT 84322-6300
U.S.A.
2. Remarks on the comments of Dr. R. Wang regarding the plasmon
and organellar genome designation
1. On the nuclear genome designation:
It is a good idea to consider the donor of cytoplasm in formulating
the nuclear genome constitution of amphiploid species, because it is
a general rule to indicate the female parent first followed by the
male parent in showing a hybrid cross combination.
However, the presently used nuclear genome formulae recognize the
priority for the genus specific (in the case of Triticum
species) or the section-specific genome (in the case of
Aegilops species), placing these genomes in the top of the
genome formulae. Those are the A genome of the Triticum
genomes, the C genome of Cylindropyrum, the Cu genome
of Polyeides, and D genome of Vertebrata, the sections of
Aegilops. I am in favor of retaining the present genome
formulae because the species characteristics are mainly controlled by
the nuclear genomes.
2. On the code number of the cytoplasm:
This is the accession number given to each cytoplasm. Nos.1-20 are
reserved for the cytoplasms of diploid species, nos. 21-50 for those
of tetraploids, and no. 51 and above for those of hexaploids. The
sources of the cytoplasms corresponding to the presently used code
numbers are given in the following table;
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