%0 Journal Article %T Potencial da microbioliza o de sementes de arroz com rizobact¨¦rias para o biocontrole do nematoide das galhas Potential of microbiolization of rice seeds with rhizobacteria for root-knot nematode biocontrol %A Juliane Ludwig %A Andr¨¦a B. Moura %A Cesar B. Gomes %J Tropical Plant Pathology %D 2013 %I Sociedade Brasileira de Fitopatologia %X Avaliou-se o potencial de oito isolados de rizobact¨¦rias que eficientemente controlam doen as f¨˛ngicas em arroz [DFs185 (Pseudomonas synxantha), DFs223 (P. fluorescens), DFs306 (n o identificado), DFs416, DFs418 e DFs419 (Bacillus sp.), DFs422 (Bacillus subtilis), DFs471 (Stenotrophomonas malthophilia)] no controle de Meloidogyne graminicola, in vitro, e em arroz irrigado em casa de vegeta o. As rizobact¨¦rias DFs185, DFs223, DFs306 e DFs416 se destacaram na redu o da eclos o e no aumento da mortalidade de J2 de M. graminicola. Todas as rizobact¨¦rias foram capazes de produzir pelo menos um composto associado ao biocontrole de nematoides (quitinases, fosfatases, lipases, proteinases e sider¨®foros). O n¨˛mero de galhas e de ovos de M. graminicola em plantas de arroz foi reduzido em rela o ¨¤s plantas vindas de sementes n o microbiolizadas. O fator de reprodu o do nematoide foi reduzido, em m¨¦dia, em 29%, com destaque para as rizobact¨¦rias DFs185 e DFs223 que proporcionaram redu o de 35%. Esse resultado ¨¦ significativo, porque s o rizobact¨¦rias que tamb¨¦m controlam doen as f¨˛ngicas. The potential of eight rhizobacteria that effectively control fungal diseases in rice [DFs185 (Pseudomonas synxantha), DFs223 (P. fluorescens), DFs306 (not identified), DFs416, DFs418 e DFs419 (Bacillus sp.), DFs422 (Bacillus subtilis), DFs471 (Stenotrophomonas malthophilia)] was evaluated for the control of Meloidogyne graminicola in vitro and in irrigated rice in the greenhouse. The rhizobacteria DFs185, DFs223, DFs306, DFs416 and DFs419 exceeded in reducing hatching and in increasing the mortality of M. graminicola J2. All rhizobacteria were able to produce at least one compound associated with the biocontrol of nematodes (chitinasis, phosphatases, lipases, proteinasis and siderophores). The number of eggs and galls of M. graminicola in rice plants was reduced compared to plants from seeds not microbiolized. The nematode reproduction factor was reduced on average by 29%, highlighting rhizobacteria DFs185 and DFs223 that reduced 35%. This result is significant because the rhizobacteria also control fungal diseases. %K Meloidogyne graminicola %K Oryza sativa %K controle biol¨®gico %K Meloidogyne graminicola %K Oryza sativa %K biological control %U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1982-56762013005000007