7种橐吾属植物的核型

The Karyotypes of Seven Species in Ligularia

研究了７种橐吾属（Ｌｉｇｕｌａｒｉａ）植物的染色体和核形态。干崖子橐吾（Ｌ．ｋａｎａｉｔｚｅｎｓｉｓ）的核型为２ｎ＝２ｘ＝５８＝２６ｍ＋２８ｓｍ＋４ｓｔ；窄头橐吾（Ｌ．ｓｔｅｎｏｃｅｐｈａｌａ）的核型为２ｎ ＝２ｘ＝５８＝２６ｍ＋３２ｓｍ；细茎橐吾（Ｌ．ｈｏｏｋｅｒｉ）的核型为 ２０＝ ２ｘ＝ ５８＝３０ｍ＋ ２６ｓｍ＋ ２ｓｔ；宽戟橐吾（Ｌ．ｌａｔｉｈａｓｔａｔ）的核型为 ２ｎ＝２ｘ＝ ５８＝２８ｍ＋２６ｓｍ（２ｓａｔ）＋ ４ｓｔ；网脉橐吾（ Ｌ.ｄｉｃｔｙｏｎｅｕｒｅ）的核型为２ｎ＝２ｘ＝５８＝２６ｍ＋２８ｓｍ＋２ｓｔ＋２ｔ；鹿蹄橐吾（Ｌ．ｈｏｄｇｓｏｎｉｉ）的核型为２ｎ＝２ｘ＝５８＝２８ｍ＋ ２８ｓｍ＋ ２ｔ；棉毛橐吾（ Ｌ． ｖｅｌｌｅｒｅａ）的核型为 ２ｎ＝２ｘ＝５８＝２２ｍ ＋ ３４ｓｍ＋ ２ｓｔ。虽然这 ７个种的染色体数目相同，２ｎ＝５８，核型主要由ｍ和ｓｍ染色体构成，但各类的染色体数目在种间有差异。核型的对称性高，着丝点端化值（Ｔ．Ｃ）为６１．４５％～６４.９６％。除窄头橐吾和鹿蹄橐吾的染色体数与前人报道的相同外，其它５个种的染色体数目和核型均为首次报道。

The chromosome numbers and karyotypes of 7 species in Ligularia are reported in this paper The results are as follows;2n=2x=58=26m+28sm+4st for L.kanaitszienis;2n=2x=58=26m+ 32sm for L. stenocephala;2n=2x=58=30m+2sm+ 2st for L. hoookeri; 2n= 2x=58= 28m+26sm (2Sat) +4at for L. latihastata; 2n=2x=58=26m+ 28sm+ 2st+ 2t for L. dictyoneura;2n=2x=58 =28m+28sm+2st for L. hodgsonii;and 2n=2x=58=22m+34sm+2st for L.vellerea.The chro- mosomal numbers in species are the same (2n=58), and the Karyotypes are mainly composed of m-and sm-chromosomes.But,the numbers of m-,sm-and of m-, sm-and st-chromosome are species. The cen tromeric terminalization value of chromosomes is 61.45% -61.45%.The chromosome numbers and kary otypes of 5 species are reported for the first time except species are reported for the first time except that of L. stemocephala and L.hodgsonii.