title: Molecular cytogenetic studies in the ladybird beetle Henosepilachnaargus Geoffroy, 1762 (Coleoptera, Coccinellidae, Epilachninae).
abstract: The ladybird Henosepilachnaargus Geoffroy, 1762 has been cytogenetically studied. In addition we have conducted a review of chromosome numbers and the chromosomal system of sex determination available in the literature in species belonging to the genus Henosepilachna and in its closely related genus Epilachna. Chromosome number of Henosepilachnaargus was 2n=18, including the sex chromosome pair, a common diploid chromosome number within the tribe Epilachnini. The study of prophase I meiotic chromosomes showed the typical Xyp "parachute" bivalent as in the majority of species of Coccinellidae. C-banding and fluorescent staining with AT-specific DAPI fluorochrome dye have been carried out for the first time in H. argus. C-banding technique revealed that heterochromatic blocks are pericentromerically located and DAPI staining showed that this heterochromatin is AT rich. Fluorescence in situ hybridizations using rDNA and the telomeric TTAGG sequence as probes have been carried out. FISH using rDNA showed that the nucleolar organizing region is located on the short arm of the X chromosome. FISH with the telomeric sequence revealed that in this species telomeres of chromosomes are composed of the pentanucleotide TTAGG repeats. This is the first study on the telomeric sequences in Coccinellidae.
authors: Departamento de Biología Experimental. Universidad de Jaén. 23071 Jaén. Spain.
authors: Pablo
authors: P
authors: Mora
authors: Departamento de Biología Experimental. Universidad de Jaén. 23071 Jaén. Spain.
authors: Jesús
authors: J
authors: Vela
authors: Departamento de Biología Experimental. Universidad de Jaén. 23071 Jaén. Spain.
authors: Olivia
authors: O
authors: Sanllorente
authors: Departamento de Biología Experimental. Universidad de Jaén. 23071 Jaén. Spain.
authors: Teresa
authors: T
authors: Palomeque
authors: Departamento de Biología Experimental. Universidad de Jaén. 23071 Jaén. Spain.
authors: Pedro
authors: P
authors: Lorite
keywords: C-banding; DAPI staining; Henosepilachnaargus; NOR; karyotype; telomeres