Reeves, A. F. Location of af and sd on
chromosome 5.
Two of the mutants previously assigned to
chromosome 5 have been located at or near
position 14 on the chromosome map. The F2
data presented here show no recombination between sun dwarf (sd) and the anthocyaninless mutant
af. Both show linkage with mc at 13 or 14 cM in two-point tests. In a four-point test, af showed
linkage of equal intensity with mc and tf, although the presence of another anthocyanin mutant in
the mc-tf-wt stock makes interpretation of the data difficult. The data of Rick et al. (TGC 20:52-
54) showing a distance of 26 units between af and tf support the location of af between mc and tf and
expand the map by 9 units.
Over the past few years we have accumulated
more mutants that have proved to be allelic
to standard loci. All of this series were induced by
EMS seed treatment. Since they are presumably
isogenic with their respective parent lines, they might be useful for various kinds of studies on the
genetics and physiology of such single gene effects. Seeds are available to interested workers for
all mutants except the hl allele 3-95. I prefer not to attach new symbols to these because they are
exact mimics of the specified alleles. Any of them should be symbolized if in the future it were to be
used extensively and/or phenotypic differences were to be discovered. The parental lines are
designated in the following list by these symbols: MM (Moneymaker), VF 36 (LA490), VFNTCh
(LA1221, a short-internoded, multiply-resistant cherry line bred by Dr. P. G. Smith).
Rick, C. M. More new mutants at old loci.
One point of interest in this work is that all except one (3-620) of the complete
anthocyanin deficiencies has proved to be allelic to one of the 11 previously reported loci. This
experience suggests that nearly all of the loci for this phenotype have been discovered.
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