短角外斑腿蝗核型和C-带的研究

本文研究了短角外斑腿蝗（Ｘｅｎｏｃａｔａｎｔｏｐｓｈｕｍｉｌｉｓｂｒａｃｈｙｃｅｒｕｓ）的核型和Ｃ带。结果表明：短角外斑腿蝗的染色体数目为２ｎ（）＝２２＋ＸＯ＝２３，全部为端着丝粒染色体；ＮＦ＝２３；核型公式为２ｎ（）＝２ｘ＝２３ｔ。中期染色体绝对长度为７００１±２７０μｍ，按相对长度可分为三组；除所有染色体都具有明显的着丝粒带外，Ｌ２，Ｍ３，Ｍ４，Ｍ５，Ｍ９还有明显的端带；染色体组中Ｃ带带纹总长与染色体总长的比值百分数为２６００±２２０％；最长与最短染色体之比为３７８∶１，臂比大于２∶１的染色体在染色体组中的比例为零，短角外斑腿蝗的核型属“１Ｂ”核型

REASERCH OF KARYOTYPES AND C-BANDING OF XENOCATANTOPS HUMILIS BRACHYCHRUS

Having investigated the karyotypes and c-banding of Xenocatantops humilis brachycerus, the result shows that, the chromosomal number of Xenocatantops humilis brachycerus is 2n()=22+XO=23, and they all are end-centromere chromosomes; the karyotypes formula is 2n()=2X=23t, and NF=23; the absalute length amount of Metaphase Ⅱ Genome is 70 01±2 70 μm Accrcding the relative length of chromosomes we can divide chromosomes into three groups, and all chromosomes hare obvious centromere C-band, and there are cleur end C-bandsnon the chromosomes of L 2,M 3,M 4,M 5,M 9,The amount of heterochromatin is 26 00±2 22% The ratio between the longest and the shortest in Genome is 3 78∶1, the ratio that more than 2∶1 in Genome is zcro The Xenocatantops humilis brachycerus Karyotype belongs to “1B”