Genetic Analysis of Resistance to Linseed Wilt

Six Unseed (Linum usitatissimum Linn.) types, 3 resistant, R-5S2, R-556 and G-194, and 3 susceptible, IPI-6, R-17 and G-440, to wilt were subjected to a diallel crossing involving 15 crosses. Out of these, three crosses, IPI-6 × R-17, IPI-6 × G-440 and R-17 × G-440, were with both the susceptible parents; nine crosses, 1PM × R-552, IPM × R-556, IPI-6 × G-194, R-17 × R-552, R-17 × R-556, R-17 × G-194, G-440 × R-552, G-440 × R-556 and G-440 × G-194, involved a single resistant parent; and three crosses, Jt-552 × R-556, R-552 × G-194 and R-556 × G-194, with both resistant parents. Genes governing resistance were worked out by χ² test. A monogenic, digenic and trigenic pattern of gene action was recorded for the resistance to linseed wilt (Fusarium oxysporium) in the crosses studied.