Inheritance of Leaf and Head Resistance of Winter Wheat toSeptoria nodorumin a Diallel Cross

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Abstract
A diallel analysis of four parents of similar heading date and plant height but differing in resistance to Septoria nodorum on leaves and heads (as estimated by area under the disease progress curves) showed that the genetic variation is mainly additive. Statistical tests for the nonadditive variation indicated that dominance for susceptibility was significant, but that interaction between nonallelic genes was not. No cytoplasmic effects could be detected. Heritability estimates based on parents and F1''s varied between 0.48 and 0.68. Estimates based on the standard-unit method were 0.30 and 0.26 for flag leaves and heads, respectively. Evidence for independent segregation of the genes controlling head and leaf resistance could be found by correlation analysis between F2''s and F3''s.