摘要
以精巢为材料，研究了细螯沼虾有丝分裂染色体及减数分裂二价体组型。细螯沼虾染色体数目２ｎ＝１００，ｎ＝５０；有丝分裂中期染色体小，呈点状，无法进行核型分析；减数分裂双线期二价体呈棒状，着丝点清晰，染色体总臂数ＮＦ＝１７２，核型公式为Ｎ＝３０Ｍ＋６ＳＭ＋１４ＳＴ，Ｔ。此外，本文还对沼虾属的核型演化关系进行了初步探讨。
The mitotic chromosomes and karyotype of meiotic bivalents in the prawn, Macrobrachium superbum Heller, were studied with preparations of testis. The specimens were collected from the East Tai Lake, Jiangshu province, China. Both of mitotic and meiotic divisions were found in chromosomes 123 mitotic and meiotic chromosomes were observed in 12 prawns. The diploid and haploid chromosome numbers are 100 and 50, respectively. All the mitotic chromosomes are dot-shaped, which makes it impossible to analyse karyotype from mitotic chromosome metaphase. The bivalents at meiotic diplotene are rod-shaped. Centrometes position could be identified easily on the bivalents. According to the relative length and arm ratios, the haploid set of chromolsomes was divided into 3 genomes. The foundamental number of chromosomal arms (NF) was found to be 172. The chromosome formula was N=30M+6SM+14ST, T. The phylogenetic relationships among the genus Macrobrachium were preliminarily discussed as well.
出处
《中国水产科学》
CAS
CSCD
1997年第1期1-6,共6页
Journal of Fishery Sciences of China
关键词
细螯沼虾
染色体
二价体
核型
acrobrachium superbum, Chromosome, Bivalent, Karyotype
