RICE DWARF MUTATIONS AND THEIR INHERITANCE*

Abstract
Four types of dwarf mutations in rice, Thickset Dwarf, Intermediate Dwarf, Grassy Dwarf, and Double Dwarf, were collected in the Southern rice area between 1936 and 1941. In crosses with normal types, both Thickset Dwarf and Grassy Dwarf behaved as simple recessives. When the Grassy Dwarf type was crossed with the Thickset Dwarf, the,F1 plants were of normal height. The F2 showed a 93:3:1 ratio of normal, Grassy Dwarf, Thickset Dwarf and Double Dwarf plants, respectively. The Double Dwarf type appeared as a double recessive class.

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