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Oito bactérias endofíticas de plântulas de pimenta-do-reino foram testadas em casa de vegetação, objetivando controlar Fusarium solani f. sp. piperis e avaliar respostas morfofisiológicas das plantas tratadas com os agentes de controle. Plantas com quatro meses de idade tiveram o sistema radicular tratado com as suspensões bacterianas (10(9) ufc mL-1) por 10 minutos, e foram plantadas em vasos com solo natural infestado artificialmente com o patógeno (0,25%). O delineamento experimental foi inteiramente casualizado, com três repetições para avaliar o comportamento fotossintético, a produção e a alocação de biomassa, e cinco repetições para avaliar a mortalidade das plantas. As avaliações foram feitas 120 dias após a instalação do ensaio. O isolado B0 (Methylobacterium radiotolerans) controlou F. solani f. sp. piperis, provocando redução significativa do número de plantas mortas. Na ausência do patógeno, M. radiotolerans funcionou ainda como promotor de crescimento. Os demais isolados testados não apresentaram efeito na diminuição da mortalidade das plantas. A aplicação das bactérias endofíticas não afetou a taxa fotossintética instantânea das plantas, à exceção de B6, que teve efeito negativo. As plantas tratadas com M. radiotolerans priorizaram a alocação de carbono para a parte aérea. Eight endophytic bacteria from black pepper seedlings were tested under greenhouse conditions aiming to control Fusarium solani f. sp. piperis and to evaluate some morphophysiological responses in plants treated with the biocontrol agents. Four-month old plants had their roots treated with the bacterial suspensions (10(9) cfu mL-1) for 10 minutes and were planted in pots containing soil artificially infested with the pathogen (0.25%). The experimental design was completely randomized, with three replications to evaluate photosynthetic behavior, and biomass production and allocation, and five replications to evaluate plant mortality. Evaluations were made 120 days after the establishment of the experiment. The isolate B0 (Methylobacterium radiotolerans) significantly reduced seedling mortality by fusariosis. No significant effect in seedling mortality reduction could be detected for the other bacterial isolates. In the absence of the pathogen, M. radiotolerans acted as a plant growth promoter. The application of the bacterial endophytes had no effect on the instantaneous photosynthetic rate, with the exception of B6, that had a negative effect. Plants treated with M. radiotolerans allocated carbon preferentially to the above ground tissues

Controle da fusariose em plantas de pimenta-do-reino com bactérias endofíticas: sobrevivência e respostas morfofisiológicas