In females of Df(1)v-L4/+(0/+) genotype, the presence of the wild-type allele ofsmall bristles (sbr) gene in a single dose has no significant effect on their fecundity, whereas a reduced dose of the temperature-sensitive allele sbr 10 (l(1)ts403) causes a strong sterilizing effect in females Df(1)v-L4/sbr 10 (0/sbr 10) at permissive temperature. We studied the contribution to this effects of the following factors: resorption of egg chambers, decreased oviposition, offspring death at the embryonic and larval stages, and reduced fecundity in females 0/sbr 10. Sterilizing effect of the mutant sbr 10 allele proved to be primarily caused by offspring lethality at the embryonic and first-instar larval stages. In 0/+ females, the majority of undeveloped eggs contained embryos that perished at the late developmental stages, whereas in females 0/sbr 10, at least 50% of undeveloped egg showed no visible signs of development or the embryo development was arrested at early stages of embryogenesis. The results obtained suggest insufficiency of the temperature-sensitive allele sbr 10 in haploid state to ensure the reproductive functions of Drosophila melanogaster females.
Russian Journal of Genetics – Springer Journals
Published: Oct 18, 2004
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