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Restoration of native vegetation and fuelwood production are important environmental pending goals for Mexico, where years of wrong management practices resulted in ecosystemic degradation and fuelwood scarcity. In degraded areas, native rhizobial strains are often undetectable, therefore, the restoration of natural vegetation associated with an effective nodulation of the leguminous trees is mostly appropriate. Sinorhizobium americanum is a native nitrogen-fi xing bacteria isolated from nodules of the native Acacia species in the region. Acacia farnesiana is a multipurpose leguminous shrub from Mexican seasonally dry tropical forests (SDTF). In this study we analyzed the effect of inoculation with S. americanum on A. farnesiana growth in a greenhouse and in a very degraded area and compared with non-inoculated seedlings. In a greenhouse, we measured the biomass dry weight of different parts of the plant, using destructive sampling after 15, 20, 30, 45 and 120 days of growth. We also calculated the relative growth rate (RGR) and the resources allocation (root/shoot weight ratio and root length/root dry weight) of seedlings. In a degraded area we measured the seedling length and survival and calculated the RGR. In the greenhouse and in the degraded area, the inoculation positively affected the growth of seedlings. However in the greenhouse, the inoculation did not have effect on resource allocation patterns. Therefore, the inoculation with Sinorhizobium americanum could improve the A. farnesiana growth and the re-establishment of important plant-soil interactions in degraded areas, being a recommendable technique for land restoration and the improvement of fuelwood production. RESUMO: Restauracao da vegetacao nativa e producao de lenha sao importantes metas ambientais pendentes para o Mexico, onde anos de praticas de manejo equivocadas provocaram degradacao ecossistemica e escassez de lenha. Nessas areas degradadas, estirpes de rizobio nativas sao muitas vezes indetectaveis e, portanto, a restauracao da vegetacao natural, associada com uma nodulacao efetiva das arvores leguminosas e mais adequada. Sinorhizobium americanum e uma bacteria fi xadora de nitrogenio isolada de nodulos de especies nativas de Acacias na regiao do experimento de campo. Acacia farnesiana e um arbusto leguminoso com multiplos usos, nativo das fl orestas tropicais estacionalmente secas do Mexico. Neste estudo, analisamos o efeito da inoculacao com S. americanum sobre o crescimento de A. farnesiana em estufa em uma area muito degradada e comparamos com mudas sem inoculacao. Na estufa, medimos o peso da biomassa seca das diferentes partes da planta, utilizando amostragem destrutiva apos 15, 20, 30, 45 e 120 dias de crescimento. Tambem calculamos a taxa de crescimento relativo (TCR) e a alocacao de recursos (peso seco da raiz / peso seco da parte aerea e comprimento de raiz / peso seco de raiz). Em uma area degradada, medimos o comprimento e a sobrevivencia das mudas e calculamos a TCR. Tanto na estufa quanto na area degradada a inoculacao aumentou o crescimento das mudas. No entanto, na estufa, a inoculacao nao teve nenhum efeito sobre os padroes de alocacao de recursos. Portanto, a inoculacao com Sinorhizobium americanum poderia melhorar o crescimento de A. farnesiana e o re-estabelecimento de interacoes importantes solo-planta em areas degradadas, sendo uma tecnica recomendavel para a restauracao e para aumentar a producao de lenha. Palavras-chave: Restauracao, lenha, Sinorhizobium americanum, fl orestas tropicais estacionalmente secas, Mexico.

The effect of inoculation of an indigenous bacteria on the early growth of Acacia farnesiana in a degraded area