Histological studies ofMelampsora liniresistance in flax

摘要

Histological comparisons were made of immune, intermediate, and susceptible reactions ofLinum usitatissimumtoMelampsora liniat intervals after inoculation. All reactions were quite similar for the first 36ndash;48ensp;h. Immunity was correlated with length and number of hyphae per infection site as well as the number of haustoria per infection site. Haustorial size was not related to host reaction. The number of collapsed host cells and the area of starch accumulation were useful for comparison of widely divergent, but not of similar reaction types. Tissue transplant studies showed that the mycelium was killed, rather than retarded in the immune reaction.