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Doctoral Thesis
Full name
Fabiana da Silva Paula
Knowledge Area
Date of Defense
São Paulo, 2012
Pellizari, Vivian Helena (President)
Andreote, Fernando Dini
Jesus, Ederson da Conceição
Lambais, Marcio Rodrigues
Marques, Marilis do Valle
Title in Portuguese
Diversidade e estrutura funcional de comunidades microbianas em solos da Amazônia e resposta a mudanças na forma de uso do solo.
Keywords in Portuguese
Diversidade genética
Genes funcionais
Microbiologia do solo
Uso do solo
Abstract in Portuguese
O estudo buscou avaliar a diversidade de genes funcionais microbianos em solos da Amazônia, submetidos a diferentes formas de uso, empregando o Geochip. Este é um microarranjo com sondas para genes relacionados a diversos processos funcionais, incluindo ciclos biogeoquímicos. Foram avaliados solos de floresta primária, pastagens e floresta secundária. A conversão de floresta para pastagem causou alteração da estrutura funcional da comunidade e redução da diversidade de genes, e o crescimento da floresta secundária restabeleceu a estrutura e diversidade original. Fatores físico-químicos do solo correlacionaram significativamente com a estrutura da comunidade, indicando importância dos mesmos para o perfil observado. A análise de associação de genes aos ambientes revelou diferentes respostas, e um maior número de genes associados às duas florestas. Os resultados mostraram que o uso do solo para pastagem causa impactos sobre a diversidade e a abundância de genes de importância ambiental e um restabelecimento do potencial funcional na floresta secundária.
Title in English
Functional diversity and structure of Amazon soil microbial communities and response to land use changes.
Keywords in English
functional genes
Genetic diversity
Land Use
Soil Microbiology
Abstract in English
The functional gene diversity of Amazon soils under different land use systems was accessed by Geochip, which is a microarray targeting genes related to a variety of processes, including biogeochemical cycles. Soils from a primary forest, three pastures and a secondary forest were analyzed. The forest to pasture conversion led to functional structure changes and functional gene diversity loss, whereas the secondary forest growth promoted the recovery of a profile found in primary forest. Correlation of soil physical-chemical properties with the community structure was found, suggesting that soil characteristics may be driving the biological profile observed. The association index showed a range of responses and a greater number of genes associated to both forests. The results revealed an impact of pasture establishment on the diversity and abundance of environmentally important genes, and a recovery of the functional potential with secondary forest growth.
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