作 者 ：Yang Di-Qing, Zhu Xie-Fu
期 刊 ：植物分类学报 1989年 2期
关键词：银兰金兰核型；
Keywords:Cephalanthera erecta, C.falcata, Karyotype,
Abstract:
The present paper reports karyotype analysis of Cephalanthera erecta and C. falca-
ta from Lushan, China. (1) The karyotype formula of C. erecta is 2n=34=10m+ 14sm+
10st. C. falcata has two cytotypes: type A is 2n = 34 = 8m + 16sm + 10st, while
type B is 2n = 34 = 8m + 22sm + 4st. The type B is a translocation homozygote
derived from the type A by chromosomal structural reorganization, which involved a
translocation between the short arms of the 1st pair of chromosomes and the long
arms of the 3rd pair. The type B is similar to the type A in morphological characteris-
sties. (2)In the light of Stebbins’ classification of karyotypic asymmetry, three kar-
yotypes of C. erecta and C. falcata belong to “3C”. Such an asymmetrical karyotype
in a primitive genus like Cephalanthera of Orchidaceae may be of great significance
for a discussion on evolution and deserves a further study.