Disentangling the influence of earthworms in sugarcane rhizosphere

Autor(es)

Braga, Lucas P. P. ; Yoshiura, Caio A. ; Borges, Clovis D. ; Horn, Marcus A. ; Brown, George G. ; Drake, Harold L. ; Tsai, Siu M.

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 6, DEC 15 2016.
• Citações Web of Science: 4

Resumo

For the last 150 years many studies have shown the importance of earthworms for plant growth, but the exact mechanisms involved in the process are still poorly understood. Many important functions required for plant growth can be performed by soil microbes in the rhizosphere. To investigate earthworm influence on the rhizosphere microbial community, we performed a macrocosm experiment with and without Pontoscolex corethrurus (EW+ and EW-, respectively) and followed various soil and rhizosphere processes for 217 days with sugarcane. In EW+ treatments, N2O concentrations belowground (15 cm depth) and relative abundances of nitrous oxide genes (nosZ) were higher in bulk soil and rhizosphere, suggesting that soil microbes were able to consume earthworm-induced N2O. Shotgun sequencing (total DNA) revealed that around 70 microbial functions in bulk soil and rhizosphere differed between EW+ and EW- treatments. Overall, genes indicative of biosynthetic pathways and cell proliferation processes were enriched in EW+ treatments, suggesting a positive influence of worms. In EW+ rhizosphere, functions associated with plant-microbe symbiosis were enriched relative to EW- rhizosphere. Ecological networks inferred from the datasets revealed decreased niche diversification and increased keystone functions as an earthworm-derived effect. Plant biomass was improved in EW+ and worm population proliferated. (AU)

• Processo FAPESP: 13/22845-2 - Interações entre comunidade microbiana do solo de canavial e minhocas na decomposição da palhada e na emissão de gases do efeito estufa (GEE)
• Beneficiário: Lucas Palma Perez Braga
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/08564-6 - Prospecção de bioindicadores moleculares da microbiota na rizosfera do milho sob efeito de palhada na mitigação do gás N2O
• Beneficiário: Caio Augusto Yoshiura
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/51749-6 - Bioindicadores funcionais para monitoramento da qualidade do solo para o manejo sustentável da produção de biomassa em cana-de-açúcar (BIOSQ)
• Beneficiário: Tsai Siu Mui
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 15/11120-2 - Decifrando o papel da interação minhoca-microrganismo na seleção de funções benéficas para rizosfera de cana-de-açúcar
• Beneficiário: Lucas Palma Perez Braga
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado