a chromosomal breaker linked to C-I
--Michael G. Muszynski and Peter A.
A highly variegated kernel (2-6 a-d) was
isolated from a C-I isolation plot (C-I/C-I x C/C)
containing En (MNL 58:2). Crosses to various testers (Line C - a
full color line, a1-o wx, c2, C sh bz wx, r-g
and others) always showed the same segregation of 1 colored:1 variegated.
This variegated phenotype is linked to sh1 and is likely autonomously
controlled. Because of its dominant inheritance and linkage, this mutant
was designated as an unstable C-I allele. The variegated phenotype
of this mutant is most likely colorless to colored, but variable in timing.
Within the larger colored sectors (loss of C-I) of C-I-b sh Bz
Wx/C sh bz wx kernels, bz sectors can be identified and
subtending these bz sectors are smaller wx sectors. The phenotypic
pattern suggests that C-I is being lost via a chromosomal breakage
event and the BBF cycle is causing further loss of more proximal markers.
Therefore this mutant has been designated C-I-b for C-I breaker.
Mapping of the breaker and systems tests are currently underway.
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