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二倍体铁破锣的核型及四倍体细胞型的首次发现

杨亲二   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1999-01-10 发布日期:1999-01-10
  • 通讯作者: 杨亲二

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

摘要:

本文重新检查了铁破锣的核型。来自湖南新宁的40个个体中,1个个体为四倍体,其核型公式为2n=4x=32=16m+8sm+4st+4t;其余个体为二倍体,其核型公式为2n=2x=16=8m+4sm+2st+2t。来自云南大理的10个个体全为四倍体,其核型公式为2n=4x=32=16m+8sm+4st+4t。据此认为商效民(1985)报道的该种的核型分析结果有误。他至少将第4对染色体的着丝点位置辨认错了。该对染色体不具有中部着丝点而实际上具有近端部着丝点。本文还比较了铁破锣和角叶铁破锣的核型差异,并详细讨论了铁破锣属的系统位置。

关键词: 铁破锣, 核型, 系统位置

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