10种菊属(<I>Dendranthema</I>)植物的细胞学研究

10种菊属(Dendranthema)植物的细胞学研究

摘要: 对菊属(Dendranthema)在中国分布的10种20个居群的材料进行了细胞学研究,首次报道了异色菊(2n＝18,36)、银背菊(2n＝56)、楔叶菊(2n＝18,72)的染色体数目和核型,以及蒙菊(2n＝18)的染色体数目新纪录,并结合前人的工作,分析了菊属的核型特征和演化趋势,及其与该属分类群的关系。

Abstract: Ten species of the genus Dendranthema are cytologically studied. The karyotypes and chromosome numbers of D. dichrum (2n=2x=18=14m + 4sm and 2n= 4x=36=28m+6sm +2st), D. argrophyllum (2n=6x=54 = 38m + 14sm + 2st ), D. naktongense (2n=2x=18=10m + 8sm and 2n=8x=72= 50m + 14sm + 8st ) and new chromosome number record of D. mongolicum 〔2n=2x=18=12m + 2sm + 4st (2SAT)〕 are reported for the first time. Previous works have been taken into account,and the karyotypic characters and evolutional trend of Dendranthema are discussed.