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Genetic Behavior of Five Induced Dwarf Mutants in an Indica Rice Cultivar¹

The genetic control of dwarfism was studied in the mutants induced by the chemical mutagen ethyl methanesultanate in a tall indica rice (Oryza sativa L.) cultivar, ‘Tellakathera’. The five dwarfs were, dwarf-6(d₀), dwarf- 7(d₇), dwarf-8(d₈), dwarf-9(d₉), and dwarf-10(d₁₀). In crosses of the dwarfs with the tall parent, F₁ plants were tall and the F₂ plants segregated three tall to one dwarf, suggesting that each of these dwarfs is controlled by a single recessive gene. Crosses among the dwarfs produced tall F₁, plants and a dihybrid segregation pattern of nine tall to seven dwarf plants in F2, indicating these five dwarfing gene loci were nonallelic to each other.

Key Words: Short stature • Dwarf inheritance • Single gene dwarfs • Nonallelic genes

² Former graduate student, Dcp. of Genetics, Osmania Univ., Hyderabad, India, now post-doctoral fellow, Dep. of biochemistry, Univ. of Texas Health Science Center at San Antonio, TX 78284; and professor of plant genetics, Osmania Univ., Hyderabad- 500 007, India.

Received for publication February 11, 1976.