Isolation and Selection of Streptomyces Species from Semi-arid Agricultural Soils and Their Potential as Producers of Xy
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Isolation and Selection of Streptomyces Species from Semi‑arid Agricultural Soils and Their Potential as Producers of Xylanases and Cellulases Y. E. Castañeda‑Cisneros1 · Y. Mercado‑Flores1 · M. A. Anducho‑Reyes1 · J. Álvarez‑Cervantes1 · B. Ponce‑Lira2 · Z. Evangelista‑Martínez3 · A. Téllez‑Jurado1 Received: 24 February 2020 / Accepted: 6 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The Mezquital Valley (MV), Mexico, is a semi-arid region whose main economic activity is agriculture, this zone is characterized by the use of wastewater for crop irrigation. This condition has increased the amount nutrients in soils, organic carbon content and native microorganisms. The Streptomyces species are a group of saprophytic bacteria that represent between 20 and 60% of the total microbial population in soils, capable of producing metabolites of commercial importance. In this work, Streptomyces species were isolated from agricultural soils of the MV and was evaluated the production of endoglucanases (CMCase) and xylanases (Xyl) in Solid-State Cultivation (SSC). From soil samples, 73 possible strains of Streptomyces species were isolated for their ability to produce CMCase and Xyl in SSC. The study also included its characterization by morphological characteristics. Of the isolated microorganisms, 38 strains were selected as strong enzyme producers according to the measurement of the halo generated in plate and by growth on barley straw as only carbon source. Two different sizes of barley straw particle were tested, finding that the greatest enzymatic activity was observed in particle size 12. Three strains of Streptomyces species were chosen which presented the best catalytic capacities, a maximum of 100.69 AU Xyl/ gram dry matter (gdm), 82 AU Xyl/gdm and 26.02 AU CMCase/gdm for strains 30, 28 and 12, respectively. The strains were identified by ribosomal gen16s sequence and identified as S. flavogriseus, S. virginiae and S. griseoaurantiacus. It is the first report of endogluconase and xylanolytic activity by S. virginiae isolated from a semi-arid soil.
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00284-020-02160-7) contains supplementary material, which is available to authorized users. * A. Téllez‑Jurado [email protected] 1
AgroBiotechnology Laboratory, Polytechnic University of Pachuca, Carr. Pachuca‑Cd. Sahagún, km 20, Ex‑Hacienda de Santa Bárbara, C.P. 43830 Zempoala, Hidalgo, Mexico
2
Department of Agrobiotechnology Engineering, Polytechnic University of Francisco I. Madero, Carretera Tepatepec‑San Juan Tepa, C.P.42660 Francisco I. Madero, Hidalgo, Mexico
3
Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco. AC, Parque Científico Tecnológico de Yucatán, Sierra Papacal‑Chuburná Puerto, C.P.97302 Mérida, Yucatán, Mexico
The word "Actinomycetes" is derived from the Greek “atkis” (ray) and “mykes” (fungus), that is, it has characteristics of bacteria and fungi [1].
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