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To select the proper pollinizer for Japanese plum cultivars, flowering times, number of anthers and pollen grains per flower, and percentage of pollen germination of 7 cultivars were investigated. Self- and cross-compatibility of plum cultivars by controlled pollination were also examined at the National Horticultural Research Institute in Suwon. Full blooming dates were mostly from April 16 to April 18, revealing a good time-correspondence among them. ´Soldam´ and ´White Plum´ had more anthers and pollen grains per flower than other cultivars. However, percentage of pollen germination was high in ´Formosa´ and ´Santa Rosa´. Self-compatibility in Japanese type plum cultivars was lower than 2%, while their cross-compatibility was mostly high except that cross-compatibility of ´Santa Rosa´ with other cultivars was lower than 7%. Therefore, the suitable pollinizer for ´Oishiwase´, ´Soldam´, and ´White Plum´ was ´Santa Rosa´, while ´Beniryozen´ was the most suitable pollinizer for ´Formosa´.
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