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The inheritance of resistance to Rhynchosporium secalis in some European spring barley cultivars
Author(s) -
HABGOOD R. M.
Publication year - 1974
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1974.tb06885.x
Subject(s) - biology , diallel cross , heritability , cultivar , inheritance (genetic algorithm) , transgressive segregation , allele , hordeum vulgare , genetics , agronomy , horticulture , botany , gene , poaceae , quantitative trait locus , hybrid
SUMMARY The 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 F 2 generation of a 6 × 6 diallel cross and the F 3 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 F 2 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 F 3 material. Consequently the alleles conferring resistance were not completely concentrated in the most resistant cultivar studied (cv. Proctor). Heritability estimates obtained from F 2 and F 3 material suggested that field selection was of limited reliability, even when spreader drills were incorporated amongst the segregates. Single‐plant selection (in F 2 ) was considered to be of little value, and the results of F a head‐row tests would require confirmation by replicated tests in subsequent generations.