穗花杉属的核形态及其系统位置的探讨(英文)

Karyomorphology and relationships of Amentotaxus Pilg.

研究了穗花杉Amentotaxusargotaenia和云南穗花杉A .yunnanensis的核形态。它们的有丝分裂间期核都为复杂染色中心型 ,前期染色体为中间型 ,中期染色体数目均为 2n =36,核型相似 ,均为K(2n) =36=8m +2 8T ,核型不对称性属于 1B型 ,N .F .值为 44。云南穗花杉的核型为首次报道。结合其它学科的资料 ,认为穗花杉属同榧属Torreya比较接近。

In this paper, two species in Amentotaxus Pilg. from the mainland of China , A. argotaenia and A. yunnanensis , were karyomorphologically studied. They commonly showed the interphase nuclei of the complex chromocenter type and the mitotic prophase chromosomes of the interstitial type. Their karyotypes were formulated as K(2n)=36=8m+28T, both belonging to Stebbins' 1B type and with the N. F. value (number of fundamental) being 44. The chromosome number and karyotype of A. yunnanensis were reported here for the first time. Karyomorphological features of Amentotaxus , especially the N. F. value, together with other evidence, have indicated its close relationship with Torreya within the Taxaceae.