INHERITANCE OF HIGH SHOOT REGENERATION ABILITY FROM SEED CALLUS IN A RICE CULTIVAR JOSHU

The genetic control of regeneration from rice seed callus in a highly regenerating rice cultivar Joshu was studied. The reciprocal F(1)s, F- 2, B1F1 and B1F2 populations from the crosses of Joshu with the low re generating cultivars (Moritawase and Norin 1) were tested for their re generation ability, which was expressed by shoot regeneration rate. Th e results revealed that the high regeneration ability in Joshu was con trolled by a dominant and a recessive gene independently and expressio n of any one of the two genes or both of them would result in high reg eneration ability. The allelism test indicated that the dominant gene in Joshu was the same allele as in Aikoku which we reported previously . Moreover, there was no reciprocal cross difference on regeneration a bility in this study.