Abstract: Pollen morphology of strains of‘Fuji’apple was examined with scanning electron microscope(SEM). Pollen morphology among various‘Fuji’sports was compared with the polar axis length, the equatorial axis length, the ridge width, the ridge distance and the perforation diameter. The results showed that the shape of these pollen grains was prolate ellipse in side morphology and they were triangle in polarmorphology. There was 3-colporate, striped ornamentation with perforation on the surface of these pollen grains. Pollen
grains of‘Fukuhima Spur’with 42.25μm polar axis length and 25.08 μm equatorial axis length was the biggest. P /E value of‘Fuji’pollen with 1.75 was the biggest, then that of‘Nagafu 2’and ‘Wangshanhong’. They were both remarkably bigger than that of‘Yataka’. P /E value could be regarded as an important index for identifying sports. Otherwise pollen ornamentation was various in each cultivar. Therefore the above Fuji sports could be identified through SEM observation on pollen morphology.

Key words: Apple, Sports strains, SEM, Pollen, Ornamentation, P/E value