Correction of karyotype of diploid Beesia calthifolia and discovery of a tetraploid cytotype

Correction of karyotype of diploid Beesia calthifolia and discovery of a tetraploid cytotype

YANG Qin-Er

Received:1900-01-01 Revised:1900-01-01 Online:1999-01-10 Published:1999-01-10
Contact: YANG Qin-Er

Abstract

Abstract:

In this paper, the chromosomes of Beesia calthifolia were re-examined. In the 40

plant individuals of the population from Xinning County, Hunan Province, central China,

one was found to be tetraploid with the karyotype formula of 2n＝4x=32=16m+8sm＋4st

+ 4t, and the remaining were all found to be diploids with the karyotype formula of 2n＝2x

＝16=8m+4sm+2st+2t. All the 10 individuals of the population from Cangshan Moun-

tain, Dali City, Yunnan Province, southwestern China, were unexpectedly found to be te-

traploids with the karyotype formula of 2n＝4x＝32=16m+8sm+4st+4t. Tetraploid cy-

totype was reported in this species for the first time. Based on the results and those previous-

ly reported, it is considered that there may exist some errors in the results of the karyotype

analysis of this species previously reported by Shang(1985). He might have at least mistak-

enly recognized the centromere position of the fourth pair of chromosomes. This pair of chro-

mosomes should have subterminal rather than median centromeres. Furthermore, the kary-

otypic differences of B. calthifolia and B. deltophylla were analyzed and the systematic

position of the genus Beesia was discussed in detail.

Key words: Beesia calthifolia, Karyotype, Systematic position

YANG Qin-Er. Correction of karyotype of diploid Beesia calthifolia and discovery of a tetraploid cytotype[J]. .

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Correction of karyotype of diploid Beesia calthifolia and discovery of a tetraploid cytotype

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