苍山地区两种短翅型蝗虫染色体研究

Chromosome of Two Species of Short-winged Grasshoppers Form Cangshan Mountain Region

本文首次报道苍山地区两种短翅蝗虫染色体,结果表明:突缘拟凹背蝗(Pseudoptygonotus prominemaginis Zheng et Mao)2n(♂)=22+XO,全部是端部着丝点染色体,染色体组式为2L+8M+S+X,红胫缺背蝗(Anaptygus rufitibialusZheng et Mao)染色体数目为2n(♂)=16+XO,常染色体类型为两类,中央着丝点染色体(m,6条)和端着丝点染色体(T,10条);性染色体类型为端着丝点染色体,染色体组式为3L+3M+2S+X;两种短翅蝗虫的减数分裂染色体交叉频率以1位点和2位点的交叉居多。

The chromosome karyotypes of two different grasshopper species, Anaptygus rufitibialus and Pseudoptygonotus prominemaginis were reported in this paper. It was showed that Pseudoptygonotus prominemaginis karyotypes with 2n（ ♂ ） = 23, they are all telocentric chromosomes. The sex - chromosome belongs to large chromosomes, which took the first place in all chromosomes according to its relative length. Anaptygus rufitibialus karyotypes with 2n（ ♂ ） = 17, they are middle chromosomes and telocentric chromosomes, the sex - chromosome belongs to large chromosomes, its relative length was at the fourth place in all chromosomes. The cross frequencies of chromosomes of these two short - winged grasshopper species mainly appeared on locus 1 and locus 2 during the meiosome process.