青藏高原东缘3种风毛菊属植物的核型研究

Karyomorphology of 3 Saussurea species from the eastern of Qinghai-Tibeten Plateau

本研究报道了产于青藏高原东缘3种风毛菊属植物的染色体数目和核型。研究结果表明,3个种的染色体数目和核型如下:甘肃风毛菊为2n=2x=32=12m+16sm+4st,核型属2B型;大耳叶风毛菊为2n=2x=26=10m+14sm+2st,核型属2A型;波缘风毛菊为2n=2x=26=6m+20sm,核型属2B型;这3个种均为二倍体,并且在染色体中均未发现随体和B染色体。

Chromosome numbers and the karyotypes of 3 Saussurea species are studied in the eastern ed Qinghai-Tibeten Plateau. The chromosome numbers and the karyotypes were as follows： karyotype of S. ge ka of suensis was diploid （2n=2x=32= 12m＋16sm＋4st） and belongs to stebhings 2B type karyotype of S. macrota was diploid （2n=2x=26= 10m＋14sm＋2st） and belongs to stebbings 2A type karyotype of S. undulata was diploid （2n=2x=26=6m＋20sm） and belongs to stebbings 2B type. No satellites and B chromosomes have been found in these 3 species.