Genetic and cytogenetic analysis of the fruit fly Rhagoletis cerasi (Diptera: Tephritidae)

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Abstract:

The European cherry fruit fly, Rhagoletis cerasi, is a major agricultural pest for which biological, genetic, and cytogenetic information is limited. We report here a cytogenetic analysis of 4 natural Greek populations of R. cerasi, all of them infected with the endosymbiotic bacterium Wolbachia pipientis. The mitotic karyotype and detailed photographic maps of the salivary gland polytene chromosomes of this pest species are presented here. The mitotic metaphase complement consists of 6 pairs of chromosomes, including one pair of heteromorphic sex chromosomes, with the male being the heterogametic sex. The analysis of the salivary gland polytene complement has shown a total of 5 long chromosomes (10 polytene arms) that correspond to the 5 autosomes of the mitotic nuclei and a heterochromatic mass corresponding to the sex chromosomes. The most prominent landmarks of each polytene chromosome, the “weak points”, and the unusual asynapsis of homologous pairs of polytene chromosomes at certain regions of the polytene elements are also presented and discussed.

La mouche du cerisier, Rhagoletis cerasi, est un insecte nuisible important, mais au sujet duquel peu d’informations biologique, génétique et cytogénétique sont disponibles. Les auteurs rapportent ici une analyse cytogénétique de quatre populations grecques naturelles du R. cerasi, lesquelles sont toutes infectées par la bactérie endosymbiotique Wolbachia pipientis. Un caryotype mitotique ainsi que des cartes photographiques détaillées des chromosomes polytènes des glandes salivaires de cette espèce sont présentés. Le complément mitotique en métaphase est constitué de six paires de chromosomes incluant une paire de chromosomes sexuels hétéromorphes, le sexe mâle étant hétérogamétique. L’examen des chromosomes polytènes des glandes salivaires a révélé la présence de cinq longs chromosomes (10 bras polytènes) qui correspondent aux cinq autosomes des noyaux mitotiques et d’une masse hétérochromatique correspondant aux chromosomes sexuels. Les points de repère les plus saillants de chaque chromosome polytène, les « points faibles » ainsi que l’asynapsis inhabituelle de paires d’homologues de chromosomes polytènes à certains endroits des éléments polytènes sont également présentés et discutés.

Document Type: Research Article

Publication date: July 1, 2008

More about this publication?
  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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