Abstract
Experiments were carried out to know whether self-incompatibility reaction is altered in various stages of floral development of Japanese pear.
Bud pollination (3-6 days before anthesis) was effective to overcome self-incompatibility but the most effective stage was altered from year to year over 3 years. The percentages of fruit set decreased as pollinated in the later stage of floral bud development and no fruit was obtained as pollinated on and after the day of anthesis.
In the fruit obtained by bud self-pollination, several fully developed seeds were formed and they germinated at almost the same rate as compatible ones, though the percentage of fully developed seeds was considerably lower than that of crossed ones.
The period of floral development to get the sufficient fruit set following compatible pollination ranged from 4th day before anthesis to 4th day after anthesis.
