The role of species turnover in structuring bacterial communities in a local scale in the cactus rhizosphere

Author(s)

Kavamura, Vanessa Nessner ^[1] ; Taketani, Rodrigo Gouvea ^[1] ; Ferreira, Clederson ^[1] ; de Melo, Itamar Soares ^[1] ; Mendes, Rodrigo ^[1]

Affiliation

^[1] Embrapa Meio Ambiente, Rodovia SP-340 Km 127, 5, Jaguariuna, SP - Brazil

• Document type: Journal article
• Source: PLANT AND SOIL; v. 425, n. 1-2, p. 101-112, APR 2018.
• Web of Science Citations: 1

Abstract

Background and aims Cereus jamacaru is a native cactus in the semiarid biome caatinga able to withstand long periods of drought. Here, we studied the rhizosphere microbiome of this cactus to understand how precipitation affects the assembly of bacterial communities from the taxonomical and functional perspectives. Methods We selected three C. jamacaru plants in the caatinga biome, sampled the rhizosphere soil from the same plants during rainy and dry seasons and performed shotgun sequencing from total DNA isolated from rhizosphere using Ion Torrent technology. Results Acidobacteria, Actinobacteria and Proteobacteria showed increase in relative abundance during the rainy season when compared to dry season. Five major functional groups were significantly different, including differences in amino acids and derivatives, carbohydrates, protein metabolism, respiration, and RNA metabolism. Taxonomically, the assembly of bacterial communities follows a neutral model. Conclusions The assembly of bacterial communities in the rhizosphere of C. jamacaru is affected by precipitation resulting in different taxonomical and functional community patterns during dry and rainy seasons. We attribute these differences on rhizosphere communities composition to dispersal limitation of microorganisms caused by low pore connectivity due to low water content in the soil, which leads to spatially isolate communities during the dry season. (AU)

• FAPESP's process: 13/23470-2 - Metagenomics and metatranscriptomics of the microbial community involved in the transformation of organic carbon in mangrove sediments of the São Paulo State
• Grantee: Rodrigo Gouvêa Taketani
• Support Opportunities: Scholarships in Brazil - Young Researchers
• FAPESP's process: 14/16041-0 - Effects of wheat root exudates on the rhizosphere microbiome and its correlation with crop yields
• Grantee: Vanessa Nessner Kavamura Noguchi
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 11/15760-5 - Dynamics of mandacaru rhizosphere microbiome in the Caatinga
• Grantee: Clederson Ferreira
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 13/08144-1 - Metagenomics of the rhizosphere of Triticum aestivum L. obtained from wheat blast disease-suppressive soils caused by Magnaporthe grisea
• Grantee: Vanessa Nessner Kavamura Noguchi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral