A syndrome of abnormal genetic effects, which resembles Drosophila hybrid dysgenesis, is described in Ceratitis capitata. This syndrome includes high frequency of partial or complete female gonadal sterility, chromosomal rearrangements (bridges and fragments) at male meiosis, and instabilities at the white eye locus. It was observed in hybrids of C. capitata when strains of different origin were mated. The morphology of the undeveloped ovaries recovered in the medfly is apparently very similar to the gonadal distrophy which in D. melanogaster is associated with the P-M and hobo mediated dysgenic syndromes. The amount of gonadal sterility that can be observed in medfly hybrids depends on the parental strains used, which exhibit specific differences in their inducing abilities. In the considered interstrain combinations, there appears to be quantitative variation in the effect of temperature on GD sterility. The highest level of sterility occurs at 25 degrees C. The pattern of abnormal traits observed in medfly hybrids appears to be the phenotypic expression of a rather complex interacting dysgenic system of inducer and suppressor effects; probably more than one system is activated in the considered crosses.

HYBRID DYSGENESIS-LIKE PHENOMENA IN THE MEDFLY, CERATITIS-CAPITATA (DIPTERA, TEPHRITIDAE)

TORTI C;
1994-01-01

Abstract

A syndrome of abnormal genetic effects, which resembles Drosophila hybrid dysgenesis, is described in Ceratitis capitata. This syndrome includes high frequency of partial or complete female gonadal sterility, chromosomal rearrangements (bridges and fragments) at male meiosis, and instabilities at the white eye locus. It was observed in hybrids of C. capitata when strains of different origin were mated. The morphology of the undeveloped ovaries recovered in the medfly is apparently very similar to the gonadal distrophy which in D. melanogaster is associated with the P-M and hobo mediated dysgenic syndromes. The amount of gonadal sterility that can be observed in medfly hybrids depends on the parental strains used, which exhibit specific differences in their inducing abilities. In the considered interstrain combinations, there appears to be quantitative variation in the effect of temperature on GD sterility. The highest level of sterility occurs at 25 degrees C. The pattern of abnormal traits observed in medfly hybrids appears to be the phenotypic expression of a rather complex interacting dysgenic system of inducer and suppressor effects; probably more than one system is activated in the considered crosses.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12317/11096
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