3. Results and discussion
3.1. Relationship between soft-X-ray irradiation dose to pollen and number of seeds
There were no observable differences in fruit setting between soft-X-irradiated pollen and unirradiated pollen in both ‘Benikodama’ and ‘Fujihikari TR’ (Table 1). We have already observed that the germination rate of pollen treated with 800 Gy of soft-X-ray was almost the same as that of the control (Sugiyama and Morishita, 1998). These results indicate that irradiated pollen presents no practical problem for producing seedless watermelon fruit.