Genetic Effects on Host × Strain Interaction in the Symbiosis of Vicia faba and Rhizobium leguminosarum

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Abstract
50 Vicia faba lines were inoculated with 4 strains of Rhizobium leguminosarum in all possible combinations under greenhouse conditions in 5 replications. A root‐sterile method was used for the cultures. Characters such as plant height, leaf colour, number and colour of nodules, the dry weights of shoot, root and nodules, and the nitrogen content were recorded, after 10 weeks. It was demonstrated by analysis of variance that, for example, for the dry matter of the shoot only 1.9 % of the total phenotypic variance was caused by interaction between Vicia and Rhizobium genotypes, but 24.7 % Was conditioned by the faba bean genotypes and 73.4 % by the Rhizobium strains. Differences of Vicia faba genotypes in their reaction to different Rhizobium strains were detected by joint regression analysis.