wild species under investigation. Based on the study of their structural dissimilarities and differences in pairing and
on the observed large deviations from the expected 1:2 ratio of homo and homeologous bivalents, it is concluded
that there is a strong tendency towards preferential synapsis between chromosomes coming from the same
species.
Rick, C. M. Cytoplasmic mutants.
The following two cytoplasmic mutants have been added to our collection during the recent past. Since we
receive requests for such items from time to time, they deserve publicity and listing in TGC Reports. The issue of
naming and symbolizing such lines has not been faced before, so I am taking the liberty of using the following pro
term notation until a standard nomenclature is adopted. [Editor's Note - Brackets have been substituted here for the
ellipses originally suggested by the author.] Seeds of both are available to interested workers.
[Vlg] (Verkerk's cytoplasmic light green - LA1438): A number of years ago we received this line from the late
Kay Verkerk, who had discovered it in EMS-treated material, which I assume was cv. Moneymaker. The line is
uniformly light green, vigorous, and highly fertile. We have made no tests with this line but presume that it showed
strictly maternal inheritance.
[Kyg] (Khush's cytoplasmic yellow green - LA1092): We are indebted to Gurdev Khush for this interesting
line. In 1963 he spotted a green/yellow variegated plant in the progeny of our tester ms-2, ag, tv X Red Cherry,
pollen of the latter having received a heavy dose of fast neutrons in the search for deficiencies of ag and tv. Since
the plant was variegated and did not show the same phenotype as either marker, he selfed it and obtained progeny
that segregated for the yellow-green phenotype. Crosses between the homogenous yellow-green segregants and
normals, with the former as pistillate parents, yielded all yellow-green progeny, whilst the reciprocal gave only
normals. In the meanwhile we thought we had lost the line, but during 1978 discovered that the old seeds
germinated well and we have renewed the stock. We repeated the crosses, [Kyg] x [+] yielding 24 progeny, all of
[Kyg] phenotype, the reciprocal yielding 24 progeny of [+] phenotype. Since [Kyg] is weak in ear y stages, it requires
coddling, but once established in the greenhouse, it thrives and selfs fairly readily. The growing points are slightly
more yellowish, and older leaves eventually gain normal green color.
Rick, C. M. New friends at old addresses.
In the course of routine testing of new mutants, we have encountered the following allelic relationships.
According to our experience with these accessions and many others that we have tested and reported in the recent
past, if the new mutant matches the one previously described in most of their distinguishing characters, they are
almost certainly allelic. This situation holds for nearly every mutant with precise c, e, hl, Wo, etc. phenotypes. Since
each of the following were found as mutants in homozygous backgrounds, they should be useful for physiological or
other tests requiring isogenicity.
nv (3-403): A new mutant induced by EMS treatment in VF 36 with phenotype exactly matching that of nv.
Since the phenotypes matched, a cross was made between them and all 15 F1's hadnv phenotype.
sf wl : The wrinkled leaflet (wl) was described by Soressi (TGC 20:59) as a mutation induced in cv. Roma by
EMS treatment. Being struck by the close resemblance to sf in floral and foliar (except for the wrinkled leaf margins)
morphology, we mated the two and all of the 32 F1's had typicalsf leaf shape. Since wl had already been described
and differs from sf in the leaf margin trait, it deserves a distinctive symbol, hence sf wl The crimped leaf edges
behave as if completely recessive to the usual sf phenotype; we anticipate that the F2 would segregate 3 sf : 1 sf wl
Womz (LA1908): Mel Zobel (Rich Zobel's old man) presented us with a beautiful-"velvet" mutant, as he
described ( it, found as a spontaneous mutant in a field of cv VF 145-7879 in the 1977 growing season. It showed
closest resemblance to the wooly series, but unlike the majority of Wo alleles, it bred true. An F1 of the cross with
Wom which it greatly resembles, showed the
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