Studies on Karyotype of Cephalanthera erecta and C. falcat

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Studies on Karyotype of Cephalanthera erecta and C. falcat

Yang Di-Qing, Zhu Xie-Fu

Received:1900-01-01 Revised:1900-01-01 Online:1989-03-10 Published:1989-03-10
Contact: Yang Di-Qing

Abstract

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.

Key words: Cephalanthera erecta, C.falcata, Karyotype

Yang Di-Qing, Zhu Xie-Fu. Studies on Karyotype of Cephalanthera erecta and C. falcat[J]. .

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Studies on Karyotype of Cephalanthera erecta and C. falcat

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