Abstract
1. The occurrence of sterile flowers, as recessive mutation, was observed. The recessive segregates, which show a marked deficit in their segregating proportions, seem to be caused by the certation that takes place between normal and sterile microgametophytes.
2. Male-sterile-2 shows marked deficit in segregation, and so does male-sterile-3, although not so conspicuously.
3. Digenic segregation in the male-steriles shows conspicuous deficit, the recessive male-sterile ratio being low, even to the extent of appearing to be a monogenic.
4. The piebald seed character, which appeared by a new recessive mutation, is linked with the male-sterile-2, the recombination frequency being 9.1 percent.
