Li Xin-Jiang, Zhang Dao-Chuan, Wang Wen-Qiang
College of Life Sciences, Hebei University, Baoding 071002, China.
Yi Chuan. 2005 Sep;27(5):735-40.
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.
对采自中国的1943年乌瓦罗夫命名的2种异距蝗属蝗虫精子发生过程中的染色体C带核型进行了研究。结果表明，扎氏异距蝗（贝 - 别连科，1926）的二倍体染色体数目为2n（雄性）=18，新X染色体为亚中着丝粒染色体，其余为端着丝粒染色体。C带核型显示，所有染色体均呈现着丝粒旁带、靠近着丝粒C带的中间C带以及末端区域的附加C带。并且，性别决定机制为新XY型（雄性）。在中华异距蝗（乌瓦罗夫，1926）中，二倍体染色体数目为2n（雄性）=19。所有常染色体和X染色体均为端着丝粒染色体，仅具有着丝粒旁C带，性别决定机制为XO型（雄性）。这两个物种之间异染色质含量的差异在0.05水平上具有显著性。
