Madras Agricultural Journal
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Characterization of Toxin Produced by Alternaria macrospora Zimm

Abstract

                                Toxin was highly active upto 1:5 dilution. Steep fall of toxin activity was noticed at 90°. Toxin was stable at pH 8 and 9 and lost its activity at extreme acidic or alkaline pH levels. The stability of toxin after 30 days was lost to the extent of 77 per cent. Toxin produced by the pathogen inhibited seed germination of nine cotton varie- ties, and it ranged from 70 to 100 per cent. The toxin was found to be non-specific capable of affecting the seed germination of non-hosts.

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