AMES, IOWA
Iowa State University
c2-m85-2
gives rise to lethal derivatives
--Peter A. Peterson
This mutable gives a very early pattern
variegation. Though it contains a Cy element, the relationship to
Cy has not been demonstrated. In crosses of the heterozygote C2/c2
x c2/c2 a relatively high frequency of colorless kernels
arises, which would support independent control, but the segregating pattern
does not support this. A unique feature of this allele is the colorless
kernels arising from a self. In the self of C2/c2-m, the
colorless kernels when planted are unable to proceed beyond the seedling
stages: pale green seedlings appear which soon die. It appears that the
mutation to colorless gives rise to a deficient form of the c2 allele
which when homozygous, lacks a necessary function that leads to death of
the seedling. Possibly, this is an essential component of the c2
locus or an adjacent region that leads to lethality following excision
(loss of mutability).
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