摘要
】对川麦冬（Ｏｐｈｉｏｐｏｇｏｎｊａｐｏｎｉｃｕｓ）３类型的染色体核型分析表明，大叶型２ｎ＝６８＝３２ｍ（４ＳＡＴ）＋２４ｓｍ＋１２ｓｔ，小叶型２ｎ＝６８＝３２ｍ（２ＳＡＴ）＋２４ｓｍ＋１２ｓｔ和直立型２ｎ＝６８＝４０ｍ（２ＳＡＴ）＋２０ｓｍ＋８ｓｔ。前二者核型属２Ｃ，后一型属２Ｂ，其进化方向为直立型→小叶型→大叶型。根据第１号染色体４条明显中着丝粒染色体，我们认为川麦冬是一典型四倍体类型。此外，还探讨了该属的染色体基数。
The karyotypes of three types of Ophiopogon japonicus were studied. The karyotype of the “large leaf type” was shown to be 2n=68=32 m (4SAT)+24 sm+12 st, that of the “small leaf type” 2n=68=32 m (2SAT)+24 sm+12 st and that of the “vertical leaf type” 2n=68=40 m (2SAT)+20 sm+8 st. The karyotypes of the first two are of the 2C type while that of the third is of the 2B type. Their evolutionary trend is speculated to be vertical leaf type to small leaf type to large leaf type. Based on the presence of four metacentric chromosomes, O.japonicus in Sichuan is presumed to be a typical tetraploid. The basic number of chromosomes in this genus is also discussed.
出处
《西南农业大学学报（自然科学版）》
CSCD
1998年第4期307-310,共4页
Journal of Southwest Agricultural University
关键词
川麦冬
染色体
染色体组型
Ophiopogon japonicus
chromosomes
karyotype
