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Estudaram-se as reações do inhame Dioscorea alata cv. São Tomé e D. cayennensis cv. Da Costa em relação à severidade da podridão-verde, causada pelo fungo Penicillium sclerotigenum. Ao mesmo tempo, foi pesquisada à ocorrência de especialização fisiológica do agente causal, em relação à patogenicidade, nas mencionadas espécies de inhame. Para complementar esse estudo, analisou-se, in vitro, o crescimento micelial de P. sclerotigenum em três meios de cultura semi-sintéticos, sendo dois à base de extrato de túberas das espécies de inhame supracitadas e o terceiro de batata inglesa (Solanum tuberosum), todos complementados com dextrose e ágar. Observou-se que a severidade da podridão-verde foi menor em D. alata do que em D. cayennensis, não sendo constada especialização fisiológica nos isolados de P. sclerotigenum. Corroborando com esses resultados, o crescimento e desenvolvimento dos isolados de P. sclerotigenum no meio D. alata Dextrose Ágar foi significativamente menor do que nos meios Batata Dextrose - Ágar e D. cayennensis Dextrose Agar, esses mais favoráveis para crescimento do fungo. The degree of green rot severity was evaluated in two yam species, D. alata and D. cayennensis. The causal agent of this disease is the fungus Penicillium sclerotigenum, a highly virulent pathogen on D. cayennensis in the producing areas all over the world. In addition, by cross inoculation, an investigation was conducted on the occurrence of physiological adaptations of the fungus relative to its pathogenicity on these species of yams. To complement this study the mycelial growth of P. sclerotigenum was evaluated on three culture media, two based on extracts of the yam species examined and the other one on potato (Solanum tuberosum). Dextrose and agar were added to all cultures. The results showed that green rot was less severe on D. alata than on D. cayennensis. No physiological adaptation in relation to the pathogenicity of P. sclerotigenum to both yam species was found. Potato-dextrose-agar and D. cayennensis-dextrose-agar were the best substrates for P. sclerotigenum development and growth

Severidade da podridão-verde em inhames e especialização fisiológica em Penicillium sclerotigenum