Chromosome number variation in Elatostema suzukii (Urticaceae), a species endemic to Okinawa Island, the Ryukyus

  • Yamashiro T
  • Kanemoto T
  • Denda T
 et al. 
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Five different chromosome numbers of 2n=16, 26, 38, 39, and 52 are reported in Elatostema suzukii, a species endemic to Okinawa Island, the Ryukyus. All chromosome numbers except 2n=26 are the first variations reported for this species. On the basis of x=13, the chromosome numbers of 2n=26, 38, 39, and 52 represent diploid, hypotriploid, triploid, and tetraploid cytotypes, respectively. The status of the cytotype with a chromosome number of 2n=16 is unclear. Of the five cytotypes of E. suzukii, the diploid was most abundant throughout the distribution area, while the other four cytotypes, which were relatively infrequent, occurred intermingled with the diploid cytotype. Because the polyploid cytotypes of E. suzukii are morphologically indistinguishable from the diploid cytotype, and E. suzukii is geographically isolated from other closely related species, intraspecific polyploidy in E. suzukii seems to represent an example of autopolyploidy.

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  • T. Yamashiro

  • T. Kanemoto

  • T. Denda

  • M. Yokota

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