三种毛茛的核型研究

对３种（含１变种）毛莨属植物进行了核型研究，其染色体数目及核型资料为首次报道。三叶毛莨（ＲａｎｕｎｃｕｌｕｓｊａｐｏｎｉｃｕｓＴｈｕｎｂ．ｖａｒ．ｔｅｒｎａｔｉｆｏｌｉｕｓＬ．Ｌｉａｏ．）有两种核型。即基本型２ｎ＝２ｘ＝１４＝６ｍ＋４ｓｍ＋４ｓｔ（２ＳＡＴ）和杂合型２ｎ＝２ｘ＝１４＝６ｍ＋４ｓｍ＋４ｓｔ（１ＳＡＴ），前者核型的特征是其随体较大，而后者核型变异发生在第２对和第３对同源染色体异形上，并

STUDY ON THE KARYOTYPES OF TWO SPECIES AND ONE VARIETY IN RANUNCULUS FROM CHINA

in the present paper,karyological studies were carried out in two species and one varietyo f Ranunculus L. from China. Their chromosome numbers and karyotypes are all reported here forthe first time. Ranunculus Pponicus Thunb. var. ternatiplius L. Liao shows two differentkaryotypes i. e. common type 2n= 2x= 14= 6m 4sm 4st(2SAT) and heterozygous type2n= 2x= 14= 6m 4sm 4st(1SAT). The former karyotype characteristic is that the satellite islarger. The latter karyotype variations are the occurrence of heteromorphous homologouschromosomes of second pair and the sixth pair SAT-chromosome posses only one satellite,Ranunculus diffusus DC. karyotype formula is 2n = 4x = 32 = 10m 8sm 12st(2SAT) 2t(2SAT). Itconsists of two different genomes. One of them is that the satellite is far larger than the short arm.The other is that the satellite is smaller than the short arm, Ranunculus sileriplius Lvi. karyotypeformula is 2n = 4x = 32 = 8in 6sm 18st(4SAT). It consists of four chromosome sets which is basiclysimilar in karyotype.