作 者 ：WANG Yin-Zheng, GU Zhi-Jian
期 刊 ：植物分类学报 1999年 2期
Keywords:Karyomorphology,
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. _ .