Pollen diameter of Sasa cernua MAKINo and S. senanensis (FRANCH. & SAVAT.) REHD. in small-scale flowering at Sapporo, central Hokkaido

摘要

A small-scale flowering of Sasa cernua and S. senanensis was observed at the Experimental Forest of Hokkaido Research Center in May 2006. Pollen grains were collected and measured diameter. The average diameter of S. cernua pollen was 43 mu m, and that of S. senanensis was 37 mu m. These results indicate that the size of the pollen grains is within the range of the Poaceae. The diameter of S. cernua varied in size, however, all pollen grains were sound. This evidence would not be a possible reason tosupport the hybrid origin of S. cernua.