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Inheritance of Dwarf and Semidwarf Plant Height in Barley¹

Inheritance of dwarfism in barley (Hordeum vulgare L.) was studied in a six parent diallel involving the standard height cv. ‘Larker’ and five short statured lines: OR-SS-2, Minn. 66-102, ‘Indian Dwarf,’ ‘Apam Dwarf’ and Xv 2334-6R. Data from F2 populations and selected F₃ progenies indicated that four recessive gene pairs segregating independently account for the differences observed in plant height. Apam Dwarf, Indian Dwarf and Xv 2334-6R appear to have the same two major recessive gene pairs for dwarfness which act in an additive manner. Minn. 66-102 and OR-SS-2 each carry a different single recessive gene pair for semidwarf plant height. Segregation observed in crosses among Minn. 66-102, OR-SS-2, and Apam Dwarf indicated all three parents have different genes for dwarfness. Four genes were identified. They are recessive, additive and are transmitted independently.

Key Words: Dwarf sources • Diallel cross • Major genes • Hordeum vulgare L.

² Former graduate student (now assistant professor, Dep. of Agronomy, Kansas State Univ., Manhattan, Kansas 66506); professor of agronomy and plant geneticist, USDA, Crop Science Dep., Oregon State Univ., Corvallis, OR 97331.

Received for publication August 18, 1980.