摘要
本文对分布于安徽江南和江淮两个地区野生居群的换锦花Ｌｙｃｏｒｉｓｓｐｒｅｎｇｅｒｉ进行了细胞学研究，发现换锦花为一复合体，包括两个不同类型：（１）三倍体类型，分布于安徽马鞍山市采石的野生居群，其染色体数目和核型为２ｎ＝３３＝９ｓｔ＋２１ｔ＋３Ｔ，属４Ａ核型，极其稳定，该种的三倍体类型为首次发现；（２）二倍体类型，分布于滁州市琅琊山的野生居群，发现有２个核型，核型Ⅰ，２ｎ＝２２＝８ｓｔ＋１４ｔ，属４Ａ核型，约占观察细胞的８０％；核型Ⅱ，２ｎ＝２２＝１ｍ＋１ｓｍ＋１４ｓｔ＋６ｔ，属３Ｂ核型，约占观察细胞的２０％，该染色体核型为首次报道。换锦花三倍体居群和二倍体居群的植物外部形态特征基本相同。本文还指出罗伯逊变化在石蒜属核型演化中起了关键作用。
Lycoris sprengeri Comes ex Baker is endemic to China. Reported in the present paper are the chromosomes number and karyotypes for two wild populations of the species from Anhui. (1)Caishi population has a karyotype 2n=33=9st+21t+3T. The length of chromosomes ranges from 5.58～9.15 μm. The karyotype belongs to Stebbin's(1971)“4A”. (2)Longyashan populations have two karyotypes. The karyotype formula of the type Ⅰ is 2n=22=8st+14t, with chromosomes ranging from 6.88～9.15 μm. The karyotype belongs to “4A”. The karyotype formula of the type Ⅱ is 2n=22=1m+1sm+14st+6t, with chromosomes ranging from 7.20～15.80 μm. The karyotype belongs to “3B”. The triploid type of L. sprengeri was discovered in Anhui for the first time. The karyotype 2n=22=1m+1sm+14st+6t in diploid type of this species is here reported for the first time. The Robertsonian change plays a key role in karyotype evolution of Lycoris.
出处
《植物分类学报》
CSCD
1999年第1期35-39,共5页
Acta Phytotaxonomica Sinica
基金
安徽省教委科研基金
重点学科基金
关键词
换锦花
三倍体
安徽
Lycoris sprengeri Comes ex Baker
Triploid
Anhui
