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In Arabidopsis thaliana, a mutation in the SIN 1 gene causes aberrant ovule development and female-specific sterility. The effect of the sin 1 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 sin 1 with a second recessive gene, which we term mod 1. The recessive mod 1 allele in a homozygous sin 1 mutant plant reduces internode length and ovule integument size. The mutation sin 1, but not mod 1, has a demonstrable effect on ovule morphology when acting independently. In our crosses mod 1 was inseparably linked to the well known mutation erecta that is known to cause a reduction in internode and pedicle lengths.

sin 1, a mutation affecting female fertility in Arabidopsis, interacts with mod 1, its recessive modifier.