Abstract: Pollen morphology of 31 plum resources from cold areas was observed by SEM, and the index of the polar axis, the equatorial axis, the crestiform axis, the perforation axis and the perforation frequency were also measured. The analysis shows that the pollen size of 31 plum species belong to small to middle type. The sharp of most of the plum species is protate (rate=2~1.14) and the sharp of nuixin plum, long plum 17 and jilin plum 6 is preprotate (rate>2). All of them have 3 pullulation channels with the same distance and the same direction with the polar axis. The exine sculpture of 31 types is open, half open and unopen. The exine sculpture of 31 plum resources have 7 types, most of the plum species belong to crestiform sculpture and branch multpullulation sculpture, short sweet plum and longyuan honey plum are cloudy sculpture, yanji plum is brain veins sculpture. Based on the index of the polar axis, the equatorial axis, the crestiform axis, the perforation axis and the perforation frequency, using the droppings cluster analysis, nuixin plum has far distance relationship with other species.

Key words: plum, pollen, SEM