Karyological Studies of Gentianopsis Ma and Some Related Genera of Gentianaceae from China.

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Chromosome numbers were documented for 11 taxa representing 5 genera of Gentianaceae from China. Gentianopsis lutea, G. paludosa var. paludosa and var. ovato-deltoidea were diploid with 2n=26; G. grandis was tetraploid with 2n=52 (n=26); while both diploid (2n=26, n=13) and tetraploid (2n=52) cytotypes were found for G. barbata. The tetraploid number was found for the first time for the genus. The present results confirmed the basic number x=13 for the genus and revealed that the mountainous regions of western and southwestern China and the adjacent Himalayan area probably represent the most important origin and primary diversification centre of the genus, with regard to the distribution pattern of cytotypes. The chromosome number of Comastoma polycladum was 2n=16 with two satellited chromosomes is reported here for the first time. The chromosome number of C. pulmonarium was 2n=18, without any visible satellite which differed from previous reports. Lomatogonium rotatum and L. macranthum all had 2n=16 chromosomes. It is the first report of chromosome number for the second species. Swertia diluta was found to have 2n=20 chromosomes, again mentioned for the first time. The chromosome number 2n=22 was confirmed for Halenia elliptica.
財団法人日本メンデル協会の論文