川滇冷杉的核型分析兼论冷杉属的进化地位

本文分析了我国特产树种川滇冷杉Abies forrestii的核型,K(2n)=24=14 m+8 sin+2 st,属2B类型,染色体相对长度组成为2n=24=2 L+10 M_2+10 M_1+2 S。冷杉属植物(除川滇冷杉)的核型全由中部和近中着丝粒染色体组成,属2A类型(表2)。根据松科各属核型的比较,作者讨论了冷杉属的亲缘关系和进化地位,并得到形态学、解剖学、生化学、古植物学等的支持。

KARYOTYPE ANALYSIS OF ABIES FORRESTII WITH A DISCUSSION ON THE EVOLUTIONAL POSITION OF ABIES ( PINACEAE )

The present paper deals with the karyotype analysis of Abies forrestii C. C. Rogers endemic to China. The karyotypic formula of the species is K(2n)=24 = 14 m+8 sm+2 st, which belongs to Stebbins' 2B type and the chromosome complement on relative length is 2n=24=2L+10 M2+10 M1+2S. The karyotypes of the genus Abies (excl. A. forrestii) are composed of metacentric and submetacentric. chromosomes and belong to 2A type (see Table 2 ). On the basis of the comparison among the karyotypes of pinaceous genera, the author discusses the relationship and evolutionary position of Abies. The conclusions are also supported by the data from morphology, anatomy, biochemistry, palaeobotany and so on.