摘要
在裸子植物中,多倍体是很少的。但发现三倍体的香榧在大的成年树和幼苗中都普遍存在。同时却从未发现过四倍体及其他多倍体。从基本核型看,与二倍体植株没有什么差别。都是由大小稍有差别的中部着丝点染色体组成,其中三个染色体有随体(图1)。很像是同源三倍体。香榧的 Giemsa C 带研究已有报道。在一对具次缢痕的染色体上。
The complement of triploid Torreya grandis was stained with the conventional and C-banding methods.The fundamental karyotype of each monoploidy set is simi- lar to diploid plant indicating their autotriploid nature.The only C-band which lo- cated on the positions of secondary constrictions of the three homologous chromoso- mes showed different size.Therefore,the complement of triploid Torreya grandis may be arisen as a result of fusion between the female diploid and the male hapl- oid.
关键词
香榧
染色体组
C带
Torreya grandis
Complement
C-banding
