The number of normal seeds was significantly reduced when female flowers were pollinated with irradiated pollen.
In ‘Benikodama’, normal seeds were not observed at 400–1000 Gy (Fig. 2).
200–400 empty seeds per watermelon were observed at 100–1000 Gy.
In ‘Fujihikari TR’ irradiated with the 800–1000 Gy, empty seeds alone were produced (Fig. 3).