Nitrogen-Fixing Bacteria in Eucalyptus globulus PlantationsReportar como inadecuado

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Eucalypt cultivation is an important economic activity worldwide. In Portugal, Eucalyptus globulus plantations account for one-third of the total forested area. The nutritional requirements of this crop have been well studied, and nitrogen N is one of the most important elements required for vegetal growth. N dynamics in soils are influenced by microorganisms, such as diazotrophic bacteria DB that are responsible for biological nitrogen fixation BNF, so the aim of this study was to evaluate and identity the main groups of DB in E. globulus plantations. Samples of soil and root systems were collected in winter and summer from three different Portuguese regions Penafiel, Gavião and Odemira. We observed that DB communities were affected by season, N fertilization and moisture. Furthermore Bradyrhizobium and Burkholderia were the most prevalent genera in these three regions. This is the first study describing the dynamic of these bacteria in E. globulus plantations, and these data will likely contribute to a better understanding of the nutritional requirements of eucalypt cultivation and associated organic matter turnover.

Autor: Marliane de Cássia Soares da Silva, Thiago de Almeida Paula, Bruno Coutinho Moreira, Manuela Carolino, Cristina Cruz, Denise Mar



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