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Failure of in vitro growth inhibition by cysteine to differentiate between Australian Gaeumannomyces graminis isolates pathogenic and non‐pathogenic to oats
Author(s) -
YEATES J. S.
Publication year - 1986
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1986.tb03187.x
Subject(s) - biology , cysteine , in vitro , microbiology and biotechnology , take all , pathogenic fungus , agar , fungus , agar plate , erysiphe graminis , botany , bacteria , biochemistry , poaceae , enzyme , hordeum vulgare , genetics
SUMMARY Radial growth of oat and non oat‐attacking Australian isolates of Gaeumannomyces graminis was greatly inhibited by increasing concentration of DL‐cysteine in basal medium agar, and growth was completely inhibited by cysteine concentrations of 3 μM. As a group, isolates of G. graminis var. tritici (both oat and non oat‐attacking forms) were more inhibited than isolates of G.graminis var.avenae at 1 μ M cysteine, but differences did not occur at other concentrations. Isolates of a lobed‐hyphodiate fungus similar to G. graminis var. graminis were more tolerant of cysteine than other isolates. The findings indicate that in vitro inhibition of Australian G. graminis isolates by cysteine is not useful for differentiation between oat and non oat‐attacking types, and is unlikely to be fundamentally related to the ability of isolates to attack oats.