毛茛属五种植物的核型

对中国云南毛茛属（Ranunculus）5种植物核型进行研究，结果表明，毛茛组茴茴蒜（Ranunculus chinensis Bunge）和禺毛茛（R．cantoniensis DC．）核型公式为2n=2x=16=6m＋4sm＋6st和2n=4x=32：14m＋6sm＋12st；该组茴茴蒜、禺毛茛和扬子毛茛（R．sieboldii Miq．）的不同居群核型存在自西向东不对称系数渐增大现象。在美丽毛茛组中，深齿毛茛（R．pulchellusvar．stracheyanus Hand．-Mazz．）的中甸居群核型（2n=4x=32=12m＋12sin＋8st）与青海居群核型（2n：4x：32：24m＋8sm）明显不同；毛果高原毛茛（R．tangusticusvar．dasycarpus（Maxim．）L．Liou）染色体数目（2n=40），核型公式（2n=5x=40=30m＋10sm）和纳帕海毛茛（R．napahaiensis W．T．Wang＆L．Liao）染色体数目（2n=40），核型公式（2n=5x=40=20m＋16sin＋4st）为首次报道。

Karyotypes of Five Species in Ranunculus

The karyotypes of five species of genus Ranunculus in Yunnan province of China were analysed. In Sect. Ranunculus, the karyotype formulas of Ranunculus chinensis Bunge and R. cantoniensis DC. were 2n =2x = 16 =6m ＋4sin ＋6st and 2n =4x =32 = 14m ＋6sin ＋ 12st. The asymmetrical karyotype co- efficient of R. chinensis, R. cantoniensis and R. sieboldii Miq., gradually increased in different population from west to east in China. In Sect. Auricomus, the karyotypes （2n = 4x = 32 = 12m ＋ 12sin ＋ 8st） of R. pulchellus var. stracheyanus Hand. -Mazz. in Zhongdian population was obviously different from that in Qinghai population （2n =4x = 32 = 24m ＋ 8sm）. The chromosome numbers and karyotypes （2n = 40,2n = 5x = 40 = 30m ＋ 10sin）of R. tangusticus var. dasycarpus （Maxim.）L. Liou and that （2n = 40,2n = 5x = 40 =20m ＋ 16sin ＋4st） of R. napahaiensis W. T. Wang ＆ L. Liao are reported for the first time.