Abstract
The effects of l-canavanine, a toxic amino acid produced by many legumes, on growth and pathogenic activities of several species of Pythium were observed. Growth of seven out of eight isolates tested was significantly enhanced following canavanine treatment. In addition, excised roots of soybean, a non-canavanine-producing legume, and jackbean, a canavanine producer, were treated with the amino acid, inoculated with P. debaryanum and gnotobiotically cultured. The incubation period for disease was unaffected by canavanine treatment of both kinds of plant prior to inoculation. Patterns of post-inoculation growth of canavanine-treated and untreated roots were used to describe disease severity. Results indicated that canavanine treatment increased root disease severity in soybean, but not in jackbean.
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