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Evaluation of the courtship and of the hybrid male sterility among Drosophila buzzatii cluster species (Diptera, Drosophilidae)
Machado, L. P. de B; Castro, J. P. de; Madi-Ravazzi, L.
  • Machado, L. P. de B; Universidade de Säo Paulo. Faculdade de Medicina. Departamento de Genética. Ribeirão Preto. BR
  • Castro, J. P. de; Universidade Estadual Paulista. Instituto de Biociências, Letras e Ciências Exatas. Departamento de Biologia. Säo José do Rio Preto. BR
  • Madi-Ravazzi, L; Universidade Estadual Paulista. Instituto de Biociências, Letras e Ciências Exatas. Departamento de Biologia. Säo José do Rio Preto. BR
Braz. j. biol ; 62(4a): 601-608, Nov. 2002. tab
Artículo en Inglés | LILACS | ID: lil-335616
RESUMO
In the Drosophila repleta group the establishment of subgroups and complexes made on the basis of morphological and cytological evidences is supported by tests of reproductive isolation. Among species in the repleta group, the buzzatii cluster, due to its polymorphism and polytipism, is an excellent material for ecological and speciation studies. Some interspecific crosses involving Drosophila seriema, Drosophila sp. B, D. koepferae and D. buzzatii strains were completely sterile while others involving strains from these species produced F1 hybrids that did not yield F2. In the present work, data on courtship duration and copula occurrence obtained in the analysis of flies from parental sterile crosses and on spermatozoon mobility observed in F1 hybrids that did not yield F2 are presented. Copula did not occur during one hour of observation and the spermatozoon also did not show mobility at any of the analyzed stages (3, 7, 9 and 10 days old). There was a high variation in courtship average duration and in the percentage of males that courted the females. The reproductive isolation mechanisms indicated by these observations were pre and post-zygotic, as supported by the absence of copula and male sterility. Data obtained also showed the occurrence of different degrees of reproductive compatibility among the strains classified as the same species but from distinct geographic localities
Asunto(s)
Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Cortejo / Cruzamientos Genéticos / Drosophila / Hibridación Genética / Infertilidad Masculina Límite: Animales Idioma: Inglés Revista: Braz. j. biol Asunto de la revista: Biologia Año: 2002 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: Universidade Estadual Paulista/BR / Universidade de Säo Paulo/BR

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Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Cortejo / Cruzamientos Genéticos / Drosophila / Hibridación Genética / Infertilidad Masculina Límite: Animales Idioma: Inglés Revista: Braz. j. biol Asunto de la revista: Biologia Año: 2002 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: Universidade Estadual Paulista/BR / Universidade de Säo Paulo/BR