Multiregional origin of B chromosomes in the grasshopper Eyprepocnemis plorans
- 138 Downloads
Analysis of chromosome localization of three molecular markers, 18S-5.8S-28S rDNA, 5S rDNA and a 180 bp satDNA, showed that B chromosomes in the grasshopper Eyprepocnemis plorans originated independently in Eastern (Caucasus) and Western (Spain and Morocco) populations. Eastern B chromosomes are most likely derived from the smallest autosome, which is the only A chromosome carrying the three markers, in coincidence with Caucasian B chromosomes. Western B chromosomes, however, lack 5S rDNA and are most likely derived from the X chromosome, which is the only A chromosome carrying the two remaining markers, always in the same order with respect to the centromere, as the B chromosome.
KeywordsRepetitive DNAs Single Polymerase Chain Reaction Product Small Autosome Paracentromeric Region Plantago Lagopus
This study was supported by grants from the Spanish Ministerio de Ciencia y Tecnología (BOS2000-1521) and Plan Andaluz de Investigación, Grupo no. CVI-165.
- Camacho JPM, Cabrero J, Viseras E, López-León MD, Navas-Castillo J, Alché JD (1991) G banding in two species of grasshopper and its relationship to C, N and fluorescent banding techniques. Genome 34:638–643Google Scholar
- Hewitt GM (1973) The integration of supernumerary chromosomes into the Orthopteran genome. Cold Spring Harbor Symp Quant Biol 38:183–194Google Scholar
- Page BT, Wanous MK, Birchler JA (2001) Characterization of a maize chromosome 4 centromeric sequence: evidence for an evolutionary relationship with the B chromosome centromere. Genetics 159:291–302Google Scholar