直瓣苣苔属、筒花苣苔属和吊石苣苔属4个种的核形态学研究

中国科学院大学学报

直瓣苣苔属、筒花苣苔属和吊石苣苔属4个种的核形态学研究

王印政,顾志建

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1999-03-10 发布日期:1999-03-10
通讯作者: 王印政

Karyomorphology of four species in Ancylostemon, Briggsiopsis and Lysionotus (Gesneriaceae)

WANG Yin-Zheng, GU Zhi-Jian

Received:1900-01-01 Revised:1900-01-01 Online:1999-03-10 Published:1999-03-10
Contact: WANG Yin-Zheng

摘要/Abstract

摘要：

本文报道了苦苣苔科直瓣苣苔属Ancylostemon、筒花苣苔属Briggsiopsis和吊石苣苔属Lysionotus

中4个种的染色体数目和核形态。凹瓣苣苔A．aureus的染色体数目为n=34，与其近缘种凸瓣苣苔

A．convexus的染色体数目相同。该种的核型公式为2n=20m(1sat)+14sm，核型类型属于2A。间期核

为复杂染色中心型(complex chromocenter type)；细胞有丝分裂前期的染色体为近基型(proximal type)

我国特有单种属筒花苣苔属Briggsiopsis的间期核为简单—复杂染色中心型(simple-complex chromocenter

type)；细胞有丝分裂前期的染色体为中间—渐变型(interstitial—gradient type)；核型公式为2n=34=25m

+6sm+3st，与近缘类群——粗筒苣苔属Briggsia染色体数目2n=34，68相比，无论染色体数目还是核

型均显示比较原始的特征。吊石苣苔属的蒙自吊石苣苔L．carnosus和翅茎吊石苣苔L．serratus D．

Don var．pterocaulis的核型公式分别是2n=30=21m+5sm+3st+1t和2n=32=21m+10sm+1t。核

型类型分别属于2A和2B。间期核均为简单—复杂染色中心型(simple-complex chromocenter type)；细胞

有丝分裂前期的染色体为渐变型(gradient type)。

关键词: 核形态学, 直瓣苣苔属, 筒花苣苔属, 吊石苣苔属, 苦苣苔科

Abstract:

Reported in the present paper are chromosome numbers and karyotypes of three

genera of the Gesneriaceae, i.e. Ancylostemon Craib. , Briggsiopsis (Franch.) K. Y. Pan

and Lysionotus D. Don. The former two genera are endemic to China. The karyotype of

Ancylostemon aureus (Franch.) Burtt is formulated as 2n = 34 = 20m(1sat) + 14sm, with

the same chromosome number as its allied species A. convexus Craib. This species is charac-

terized by the interphase nucleus of complex chromocenter type and the proximal type of

chromosomes in the mitotic prophase. The chromosome number of the monospecific genus

Briggsiopsis is 2n = 34, the same as the lowest chromosome number reported in Briggsia.

The karyotype of Briggsiopsis, which is formulated as 2n = 25m + 6sm + 3st, also seems to

be primitive among the species of the two genera. Briggsiopsis is characterized by the inter-

phase nucleus of simple-complex chromocenter type and the interstitial-gradient type of chro-

mosomes in the mitotic prophase. The chromosome number of Lysionotus carnosus Hemsl. is

the lowest reported in this genus. Its karyotype is formulated as 2n= 30 = 21m + 5sm + 3st

+ lt. Lysionotus serratus var. pterocaulis, with the karyotype being formulated as 2n= 32

= 2lm + 10sm + lt, has the same chromosome number as var. serratus. These two species

show a remarkable differentiation of karyotypes and are characterized by the interphase nuclei

of simple-complex chromocenter type and the gradient type of chromosomes in the mitotic

prophase. _ .

Key words: Karyomorphology, Ancylostermon, Briggsiopsis, Lysionotus, Gesneriaceae

王印政,顾志建. 直瓣苣苔属、筒花苣苔属和吊石苣苔属4个种的核形态学研究[J]. 中国科学院大学学报.

WANG Yin-Zheng, GU Zhi-Jian. Karyomorphology of four species in Ancylostemon, Briggsiopsis and Lysionotus (Gesneriaceae)[J]. .

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