Abstract
Dormant seeds of eight varieties of rice were compared at a dose of 2·4 krad of fast neutrons under similar pre- and post-irradiation conditions. As to seedling height and seed-set reductions, the different varieties were classified into either a radio-sensitive or resistant group. The varieties of hybrid origin gave a relatively high frequency of M 2 seedling mutations compared with the inbred varieties. These results are briefly discussed.
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