Abstract
SUMMARYThe inheritance of partial resistance to Rhynchosporium secalis, which appears to be race non‐specific, was studied in a diverse range of European spring barley cultivars. Data from the F2 generation of a 6 × 6 diallel cross and the F3 generation of three crosses selected from this diallel set suggested that resistance was complex in inheritance, the results being incompatible with any hypothesis involving less than four genes. The F2 studies indicated that both dominant and recessive genes were active in conferring resistance, and that there were significant additive gene effects. Transgressive segregation occurred in all cross combinations in the F3 material. Consequently the alleles conferring resistance were not completely concentrated in the most resistant cultivar studied (cv. Proctor).Heritability estimates obtained from F2 and F3 material suggested that field selection was of limited reliability, even when spreader drills were incorporated amongst the segregates. Single‐plant selection (in F2) was considered to be of little value, and the results of Fa head‐row tests would require confirmation by replicated tests in subsequent generations.
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