Title: Genetical and physiological studies on the dwarf mutants of the rice plants (Oryza sativa L.) : III. Effects of gibberellin A₃ on dwarf mutants of rice plants
Abstract: There are many dwarf strains among the rice varieties kept in the laboratory of Kyushu University.In the previous paper (Nagamatsu et al. 1971), the authors grouped them genetically into 8 types and re- ported that these dwarf varieties were controlled by a single recessive gene and showed various phenotypes.Van Overbeek (1934), Nakayama (1954), Galston (1959) and other workers have reported the relations of plant hormone in dwarf types in many species of plants.Recent investigations have shown that gibberellin derived from the fungus Gibberella fujikuroi Wr. increased the length of the leaves and internodes of normal plants in many species.Brian et al. (1954, 1955), Phinney (1956) and other investigators reported that sensitivity to the substance is higher in dwarf plants than in normal ones.In the present paper, the responses of the dwarf mutants of rice plants to gibberellin A3 (GA,) were dealt with. Materials and MethodsThe present experiment was performed with six dwarf varieties ;Daikoku, Chakei-daikoku, Waisei-shirasasa, Tankan-shirasasa, Kotaketamanishiki and Bunketsu-to, which were controlled by a single recessive gene.Norin No. 18, a cultivar with relatively long culm, was used as the control plant.