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Malting Quality in F_l Hybrids of Barley¹

Seed of 8 varieties of barley and all possible F₁ hybrids from crosses among the varieties were malted to obtain data on 8 malting quality characters. On the average, significant heterosis as measured from the mid-parents was observed in the F₁ hybrids for percent extract, percent malt nitrogen, and percent plump kernels. The F₁ hybrid average for percent extract was intermediate between the mid-parent and high-parent average. F₁ hybrid averages for percent malt nitrogen and percent plump kernels were similar to the low-parent and high-parent averages, respectively. The average value for the 28 F₁ hybrids and average mid-parent value did not differ for percent wort nitrogen, ratio of wort to malt nitrogen, diastatic power, 6-amylase, or ß-amylase. For these characters, with only two exceptions, the individual F₁ hybrids did not differ significantly from the average of their parents. Only 7 of the 28 F₁ hybrids were judged to be acceptable for all 8 malting quality characters. Six of these had an acceptable malting variety as one parent. Malting quality in the F₁ hybrids appeared to depend largely on the frequency of favorable genes with additive effects, although for percent extract, percent plump kernels, and percent malt nitrogen there was evidence for genes having dominance and or epistatic effects.

² Associate Professor, and former Graduate Assistant in Agronomy and Plant Genetics and Associate Professor of Biochemistry, University of Minnesota, St. Paul, Minnesota.

Received for publication February 17, 1966.