THE REACTION OF NEAR-ISOGENIC LINES OF FLAX TO THE RUST FUNGUS MELAMPSORA LINI I. HOST-PARASITE INTERFACE

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Abstract
Two near-isogenic lines of the flax cultivar Redwing, differing in their reaction to M. lini (Pers.) Lev. f. sp. liniperda Koern race '300', were studied to elaborate on the nature of the resistance in flax. In the susceptible line (rr) the fungus developed normally, producing extensive mycelium and haustoria and finally uredospores. However, in line S-66-53 (RR) no haustoria were formed, but a hypersensitive reaction was induced upon inoculation. The fungus did not appear to establish any nutritional relationship in S-66-53. The genetic control of resistance as regulated by the R locus is discussed and a hypothesis is proposed to explain the induction of the hypersenitive reaction.

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