江西5种毛莨属植物核型研究

本文报道了江西毛茛属5个种的染色体数目及核型，其中猫爪草Ranuncunlus ternatus   Thunb．(2n=4x=32；2n=2x=16=8m+2sm+6st)，肉根毛茛R．Polii Franch．(2n=2x=16=8m+2sm+6st)和杨子毛茛R. sieboldii Miq.(2n=8x-1=63=15m+18sm+22st+8t)的染色体核型为首次报道。我们认为：(1)R. ternatus Thunb．和R. polii Franch．的核型十分相似，显示出有较近的关系。(2)毛茛属Ranunculus L. 中存在较多的多倍体复合体。(3)根据王文采(1980)系统划分的美丽毛莨组(Sect．Auricomus)植物的核型属2A型；石龙芮组(Sect．Hecatonia)植物的核型属2B型；毛茛组(Sect．Ranunculus)植物核型为3A或3B型。三个组在核型上的关系和形态上的关系相似。

Studies on Karyotypes of 5 Species in Ranunculus from Jiangxi

 The present paper reports the chromosome numbers and karyotypes of 5 species in Ranunculus from Jiangxi. The result is shown in Table 1-2. The chromosome numbers of R.  ternatus Thunb.   (2n=4x=32; 2n=2x=16=8m+2sm+6st) , R.  polii Franch. (2n = 2x = 16 = 8m+2sm+6st) and R. sieboldii Miq. (2n = 8x-1 = 63 = 15m+18sm+22st+8t) are first reported. The essential points are as follows:       (1) The karyotypes of R. ternatus Thunb. and R. polii Franch. are rather similar, which shows a close relationship between the two species.       (2) Polyploid complexes are common in Ranunculus.       (3) According to the taxonomical system of Wang Wen-cai, the karyotypes of the two species investigated in Sect. Auricomus belong to “2A” of Stebbins; that of the only species in Sect. Hecatonia belong to “2B'; the karyotypes of the two species investigated in Sect. Ranunculus belong to “3A” or “3B”. The relationships among the three sections from thekaryotype are basically consistent with those based on morphology.