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Variation In Kernel Plumpness, Lodging, and Other Characteristics in Six-rowed Barley Crosses¹

Several generations of six-rowed barley (Hordeum vulgate L.) crosses of parents with a wide range of morphological and agronomic characteristics were examined for breeding behavior. Parents used were wide-kerneled ‘Larker’ and ‘X969-3,’ intermediate-kerneled ‘Dickson’ and ‘X1068-1,’ and thin-kerneled ‘Fraeg’ and ‘J2458-1.’ The latter two are short and comparatively stiff strawed.

Population means for plumpness, test weight, and plant height resembled midparent values, indicating that gene effects were additive. Some population means deviated from midparent values for increased lodging and increased grain yield. For example, small-plot yields of F₃ lines of Larker x X1068-1 averaged 5,310 kg/ha (98.7 bu/a) in 1969, compared to 5,017 kg/ha for Larker.

Heritability estimates using variance components were high for kernel plumpness, intermediate to high for test weight and plant height, low to intermediate for lodging, and slightly lower for yield. Estimates obtained by the standard unit method were usually lower than those using variance components.

Predicted genetic advance for percent kernel plumpness ranged from 3.3 to 27.7%. The observed advances were close to the predicted in 6 of 11 high-plumpness comparisons.

Key Words: Heritability • Genetic advance • Stiff straw

² Formerly Research Assistant, Professor, and Associate Professor of Agronomy, respectively, University of Wisconsin, Madison, Wis. 53706. The senior author's address is American University, Beirut, Lebanon. This research was supported in part by the Malting Barley Improvement Association, 828 North Broadway, Milwaukee, Wis. 53202.

Received for publication January 27, 1971.