Evaluation of the microbial viability of soil samples from maize crops in freeze-storage under different management conditions in a semi-arid climate

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Evaluation of the microbial viability of soil samples from maize crops in freeze-storage under different management conditions in a semi-arid climate

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Title: Evaluation of the microbial viability of soil samples from maize crops in freeze-storage under different management conditions in a semi-arid climate
Author: Ramírez Fernández, Manuel; Muñoz González, Ana María; López Piñeiro, Antonio; Albarrán Liso, Ángel; Peña Abades, David; Nunes, José Manuel Rato; Gama, José Telo da; Loures, Luis Carlos
Abstract: El efecto del congelamiento en la viabilidad de los microorganismos del suelo cultivable se determinó para muestras de suelo de tres sistemas de cultivo de maíz agrícola (bajo manejo convencional, siembra directa y siembra directa con un cultivo de cobertura). La mayoría de las bacterias de suelo cultivables no se vieron afectadas por el estrés de congelación y descongelación o el almacenamiento por congelación prolongado, pero la viabilidad de las poblaciones de moho y Bacillus mycoides disminuyó drásticamente después de ocho meses de congelación, lo que limita la sostenibilidad del proceso a este período. Sin embargo, estos cambios no afectaron significativamente ni al índice de biodiversidad de microorganismos totales ni a las diferencias de biodiversidad entre tratamientos. Según los resultados disponibles, el congelamiento del almacenamiento parece ser un proceso sostenible de hasta ocho meses que se puede permitir en los análisis de la biodiversidad de la población microbiana cultivable.The effect of freeze-storage on culturable soil microorganism viability was determined for soil samples from three agricultural maize crop systems (under conventional management, direct seeding, and direct seeding with a cover crop). Most culturable soil bacteria were unaffected by the freeze-thaw stress or the prolonged freeze-storage, but the viability of mold and Bacillus mycoides populations decreased drastically after eight months of freeze-storage, limiting the process sustainability to this period. However, these changes did not significantly affect either the total microorganism biodiversity index or the biodiversity differences between treatment. Based on the available results, freeze-storage seems to be a sustainable process for up to eight months that can be allowed in analyses of culturable microbial population biodiversity.
URI: http://hdl.handle.net/10662/9359
Date: 2017


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