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Karyotype of Sladenia and Its Systematic Insights

LI Lu,LIANG Han-Xing,PENG Hua ** (Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650204,China)  
A karyomorphological study of the monotypic genus of Sladenia is studied and compared with those of the supposedly related families,such as Actinidiaceae,Theaceae sensu stricto,and Ternstroemiaceae.It confirms that chromosome number of Sladenia is 2n=48.Sladenia has 2A karyotpye with a karyotypic formula of 2n=4x=48=4M+36m+8sm.Its interphase nucleus is characteristic of densely diffuse type.The condensation behavior of chromosomes during mitotic prophase conforms to the interstitial type.Comparative karyotype reveals that Sladenia is different from the related families not only in the basic number,but also in the size and morphology of metaphase chromosomes,the structure of interphase nuclei,condensation behavior of chromosomes during mitotic prophase,and presence or absence of the satellite and the nucleolar organizing region as well as.These dissimilarities indicate that Sladenia is far from Actinidiaceae,Theaceae sensu stricto.Moreover,the karyomorpholgical study shows that Sladenia is not close to Ternstroemiaceae,which was achieved by the previously molecular data.
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