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Inheritance of Dwarfness in Three Oat Crosses and Relationship of Height to Panicle and Culm Length¹

A stiff-strawed, dwarf oat (Avena saliva L.) line (CI 8447) was crossed to its parental line (NC 2469), a medium-height cultivar (‘Otee’), and a tall cultivar (PI 258595). All F₁ plants were semidwarf for plant height, and all F₂ distributions for height were skewed toward the dwarf-parent mean. Variation for plant height was continuous in the F₂ populations from all crosses, but F₃ families were readily classified into discrete dwarf, tall, and segregating families. The ratios of parental to segregating families fitted those expected for a model with a difference for one gene. The continuous variation for plant height in the F₂ and minor variation within parental type F₃ families was attributed to minor effects of modifying genes plus environment. The symbol Dw-7 was assigned to the single, partially dominant gene. This gene may be useful in developing semidwarf, lodging-resistant cultivars.

In all three crosses, panicle and culm length were correlated with total plant height and the relationship was linear.

Key Words: Avena sativa L. • Lodging resistance • Plant height • Culm length • Panicle length • Node number

² Research agronomist, AR-SEA-USDA and professor of plant breeding, The Pennsylvania State Univ., University Park, PA 16802; and professor crop science, North Carolina State Univ. Raleigh NC 27650.

Received for publication February 1, 1980.

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