A cytogeographical study in Hydrangea paniculata Sieb. (Saxifragaceae s.l.) in Japan

概要

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Five hundreds and forty-one samples of Hydrangea paniculata were collected in 362 sites in the Japanese Archipelago. They showed the chromosome numbers of 2n=36, 54, 72 and 108, that were diploid, triploid, tetraploid and hexaploid, respectively. The chromosome number of 2n=54 was reported here for the first time, and the other chromosome numbers verified the previous reports. The plants with the chromosome number of 2n=36 studied were distributed in the central part of Chugoku District and Ishizuchi and Tsurigi Mountains in Shikoku District. The plants with the chromosome number of 2n=72 studied were distributed in the central parts of Tokai, Kinki, Chugoku, Shikoku and Kyushu Districts. The plants with the chromosome number of 2n=108 were distributed in the parts other than the central parts of Kinki, Tokai, Hokuriku, Eastern Honshu and Hokkaido District. The plants with the chromosome number of 2n=54 were distributed in Mt. Tebako, Kochi Prefecture, Shikoku District and Mt. Imizu, Okayama Prefecture, Chugoku District. Near the habitat border among the cytotypes at higher altitude showed more diploid plants (2n=36) than tetraploid plants (2n=72) and more tetraploid plants than hexaploid plants (2n= 108).
財団法人染色体学会の論文