新疆野生黑麦(Secale cereale)的Giemsa C-带

利用BSG显带技术,将新疆野生黑麦的Giemsa C-带与其他作者的研究结果进行了比较,从而确定了黑麦C-带的基本带型为全部染色体(除随体染色体外)短臂上显末端带,随体染色体显核仁缢痕带。为此,从带型上可判断出野生黑麦与栽培黑麦之间亲缘关系密切。为栽培黑麦起源于野生黑麦提供了直接的细胞学证据。从分析比较中也看出,黑麦C-带带型的异染色质多态性现象明显存在。而野生黑麦的杂合性现象也较明显。这可能与野生黑麦本身的遗传性有关。

A Study on the Giemsa C-bands in the Chromosomes of wild Rye in Xinjiang

The Giemsa C-banding patterns of wild rye in Xinjiang are studied by using BSG Giemsa banding technique and a comparison is made between them and the results reported by other authors with the same technique. The results show that the basic patterns of rye C-bands belong to telomere bands on the short arms of all chromosomes, except the SAT-chromosome, which chromosome belongs to secondary constriction band. This implies that cultivated ryes are closely related to wild rye. And it als supplied a cytological authority for cultivated rye originated from wild rye. The heterochromatic polymorphism of C-banding patterns in rye and the heterozygosity in wild rye are found in our analysis. This may be the result from the genotype of wild rye itself.