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Genetics, Vol 137, 1101-1110, Copyright © 1994
INVESTIGATIONS |
sin1, a Mutation Affecting Female Fertility in Arabidopsis, Interacts With mod1, Its Recessive Modifier
J. D. Lang, S. Ray and A. Ray
These authors contributed equally to the work described; hence they are to be considered joint first authors.
In Arabidopsis thaliana, a mutation in the SIN1 gene causes aberrant ovule development and female-specific sterility. The effect of the sin1 mutation is polymorphic and pleiotropic in different genetic backgrounds. The polymorphism concerns morphology of the mutant ovules. The pleiotropism involves internodal distance and inflorescence initiation time. The particular ovule phenotype and the length of internodes are dependent on an interaction of sin1 with a second recessive gene, which we term mod1. The recessive mod1 allele in a homozygous sin1 mutant plant reduces internode length and ovule integument size. The mutation sin1, but not mod1, has a demonstrable effect on ovule morphology when acting idependently. In our crosses mod1 was inseparably linked to the well known mutation erecta that is known to cause a reduction in internode and pedicel lengths.
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