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Published in Crop Sci 15:457-460 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Node, Branch, and Spikelet Number in Oat Panicles. Diallel Analysis of F1 and F21

Young-am Chae and R. A. Forsberg2

The nature of gene action and inheritance controlling oat (Avetta sativa L.) panicle traits was determined from F1 and F2 generations of a diallel cross among seven parents. Traits measured were panicle length (PL), number of nodes/panicle (NNP), number of brances/node (NBN), number of branches/panicle (NBP), number of spikelets/node (NSN), and number of spikelets/panicle (NSP).

Additive genetic variances were significantly different from zero in both 1972 and 1973 and in both F1's and F2's, and additive effects of genes were more stable than dominance effects. The degree and direction of dominance varied with traits, generations, and years, except for NSN and NSP which remained at partial dominance in both years and generations.

Positive and negative alleles were equally distributed among parents for PL, NBN, NSN, and NSP, but not for NNP and NBP. Long PL and large NSN and NSP were controlled by recessive genes, while dominant genes controlled large NBN and NBP. The dominant and recessive genes controlling PL and NSP were in equal proportions in the parents, while an excess of dominant genes existed for NBN and NSN.

At least one effective factor existed for PL; two for NNP, NBN, and NBP; and three for NSN and NSP. Relatively larger heritabilities were obtained for PL (42 to 80%), NSN (79 to 82%), and NSP (63 to 79%). NSP appears to be the most reliable selection criterion for yield improvement.

Key Words: Avena sativa L. • Breeding • Yield components • Selection

1 Research supported by the Coll. of Agric. and Life Sci., Univ. of Wis., Madison, WI 53706. Part of dissertation submitted by the senior author in partial fulfillment of requirements for the Ph.D. degree.

2 Research assistant and professor of agronomy.

Received for publication June 22, 1974.




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