title: [Chromosomal C-banding karyotype of 2 species of genus Asiotmethis (Acridoidea:Pamphagidae) from China].
abstract: The chromosomal C-banding karyotype in the spermatogenesis of 2 species of Genus Asiotmethis, Uvarov 1943 from China were investigated. It was found that the diploid chromosome number of Asiotmethis zacharjini (Bei-Bienko, 1926) was 2n (male) =18, the neo-X was a submetacentric chromosome and the rest were acrocentric chromosomes. C-banding pattern showed that all chromosomes presented a paracentromeric block, an interstitial C-band near the centrometic C-block and additional C-band in the distal region. And, the mechanism for sex determination lay in neo-XY (male). In Asiotmethis jubatus (Uvarov, 1926), the diploid chromosome number was 2n (male) =19. All autosomes and X-chromosomes were acrocentric with paracentromeric C-band only, and the mechanism for sex determination lay in XO (male). The difference in heterochromatin content between the 2 species was significant at 0.05 level.
authors.affiliation: College of Life Sciences, Hebei University, Baoding 071002, China.
authors.forename: Xin-Jiang
authors.initials: XJ
authors.lastname: Li
authors.forename: Dao-Chuan
authors.initials: DC
authors.lastname: Zhang
authors.forename: Wen-Qiang
authors.initials: WQ
authors.lastname: Wang
mesh_terms: D000818:Animals; D002681:China; D002871:Chromosome Banding; D002875:Chromosomes / Q000235:genetics*; D004171:Diploidy; D007621:Karyotyping; D008297:Male; D009987:Orthoptera / Q000235:genetics*; D013045:Species Specificity; D013091:Spermatogenesis / Q000235:genetics; D014960:X Chromosome / Q000235:genetics; D014998:Y Chromosome / Q000235:genetics