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Heritability of Rachis Node Number of Avena sativa L.¹

A pure-line oat (Avena sativa L.) cultivar with a high rachis-node number was crossed with three low rachisnode number cultivars to establish the existence of genetic variability for rachis-node number and to determine its heritability. The high-rachis-node parent, CI 4897, had more than eight rachis nodes, while the other parents each had less than seven rachis nodes. Broad-sense heritability calculated from the mean of F₃ progenies was greater than that calculated from individual F₃ plant data. Although rachis-node number is subject to environmental effects, the relatively large heritability obtained from F₃ means indicates that selection based on F₃ means should be effective for increasing rachis-node number. Transgressive segregation for higher node number was not observed. Owing to the morphology of the oat panicle, an increase in node number results in a large increase in spikelet sites.

Key Words: Panicle size • Spikelet number

² Professor, Assistant Professor, and Associate Professor of Agronomy, University of Kentucky, Lexington, Ky. 40506.

Received for publication August 2, 1972.