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Inheritance of Subcrown Internode Length in a Winter Barley Cross¹

The inheritance of subcrown internode length was studied in a controlled environment in a winter barley (Hordeum vulgare L.) cross between the cultivars NE62203 (C.I. 15542), with a short subcrown internode, and MO B2632 (MO B475/‘Tschermak’), with a long subcrown internode. Cultivars with short subcrown internodes and, therefore, deep crowns have been observed to show less winter injury than those with shallow crowns. Segregation patterns of the F₂, F₃, B_1s, and B_2s generations were discontinuous. In each generation, a distinct group of progeny occurred in the 0.0 to 0.5 cm class, suggesting that short subcrown internode length is determined primarily by a gene(s) with major effect. An analysis among generation means detected relatively large dominant gene effects in the direction of long subcrown internode length. Neither a 3:1 monogenic ratio nor a 15:1 digenic ratio were able to sufficiently explain the observed segregation pattern. Apparently, genes with smaller effects also influence the expression of subcrown internode length. A heritability (narrow sense) estimate of 86.9% for subcrown internode length was obtained. Realized genetic advance for short subcrown internode length at 10% intensity of selection was 2.7 cm, or 77.1% of the F₃ population mean. Because of the high heritability and presence of a gene(s) with major effect determining short subcrown internode length, F₂ selection for short subcrown internode length should be effective.

Key Words: Crown depth • Hordeum vulgare L. • Winterhardiness • Cold injury

² Graduate research assistant and professor of agronomy, respectively, Univ. of Nebraska, Lincoln, NE 68583.

Received for publication October 12, 1983.