SUMMARY: The sulphur-containing amino acids -cysteine, -cystine, -methionine, -homocysteine thiolactone, -homocystine and glutathione at 10 to 10 inhibited sclerotial formation without inhibition of mycelial growth and induced basidia formation in the fungus Sacc. Higher concentrations inhibited linear growth and production of sclerotia. The effect of -cysteine was competitively antagonized by iodoacetic acid at a molar ratio of 30:1. Iodoacetic acid induced sclerotial formation at 3 x 10 to 10 , sclerotia being produced in circles around inoculation point. The possible role of -SH groups in the morphogenesis of is discussed.


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