格氏血厉螨染色体组型及其C—带、G—带的研究

本文首次报道了厉螨科格氏血厉螨染色体组型及其C—带、G—带的研究。结果表明格氏血厉螨染色体组型为:n=5,2n=10。为单二倍体性决定系统,雄性体细胞具有5条染色体,雌性体细胞具有10条染色体。常规染色下未见明显的着丝粒。C—带研究显示单倍体组除最大的第一号染色体为亚中部着丝粒外,其余4条均为端部着丝粒染色体.G—带染色单倍体组中期分裂相约有24条深带。尚讨论了单二倍体系统的形成机制、染色体的多态性及分带研究等问题。

Chromosomal localization of a tandemly repeated DNA sequence in Trifolium repens L

A karyotype of Trifolium repens constructed from mitotic cells revealed 13 pairs of metacentric and 3 pairs of submetacentric chromosomes including a pair of satellites located at the end of the short arm of chromosome 16.C-bands were identified around the centromeric regions of 8 pairs of chromosomes. A 350 bp tandemly repeated DNA sequence from T. repens labelled with digoxygenin hybridized to the proximal centromeric regions of 12 chromosome pairs. Some correlation between the distribution of the repeat sequence and the distribution of C-banding was demonstrated.