Bacterial Indicator of Agricultural Management for Soil under No-Till Crop Production

Bacterial Indicator of Agricultural Management for Soil under No-Till Crop Production

12 Pages · 2012 · 570 KB ·

influenced by management factors, and by climate and soil type as well. In view of that, .. of richness as a function of either geographical location or soil .. Bockstaller C, Guichard L, Makowski D, Aveline A, Girardin P, et al. (2008).

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Bacterial Indicator of Agricultural Management for Soil under NoTill Crop Production Eva L M Figuerola 1, Leandro D Guerrero 1, Silvina M Rosa 1, Leandro Simonetti 1,Mat?? as E Duval 2, Juan A Galantini 2, Jose? C Bedano 3, Luis G Wall 4, Leonardo Erijman 1,5 * 1Instituto de Investigaciones en Ingenier?? a Gene? tica y Biolog?? a Molecular (INGEBICONICET) Vuelta de Obligado 2490, Buenos Aires, Argentina,2CERZOSCONICET Departamento de Agronom?? a, Universidad Nacional del Sur, Bah?? a Blanca, Argentina,3Departamento de Geolog?? a, Universidad Nacional de R?? o Cuarto, R?? o Cuarto, Co? rdoba, Argentina,4Departamento de Ciencia y Tecnolog?? a, Universidad Nacional de Quilmes, Roque Sa? enz Pen? a 352, Bernal, Argentina,5Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabello? n 2, Buenos Aires, Argentina Abstract The rise in the world demand for food poses a challenge to our ability to sustain soil fertility and sustainability The increasing use of notill agriculture, adopted in many areas of the world as an alternative to conventional farming, may contribute to reduce the erosion of soils and the increase in the soil carbon pool However, the advantages of notill agriculture are jeopardized when its use is linked to the expansion of crop monoculture The aim of this study was to survey bacterial communities to find indicators of soil quality related to contrasting agriculture management in soils under notill farming Four sites in production agriculture, with different soil properties, situated across a westeast transect in the most productive region in the Argentinean pampas, were taken as the basis for replication Working definitions of Good notill Agricultural Practices (GAP) and Poor notill Agricultural Practices (PAP) were adopted for two distinct scenarios in terms of crop rotation, fertilization, agrochemicals use and pest control Noncultivated soils nearby the agricultural sites were taken as additional control treatments Tagencoded pyrosequencing was used to deeply sample the 16S rRNA gene from bacteria residing in soils corresponding to the three treatments at the four locations Although bacterial communities as a whole appeared to be structured chiefly by a marked biogeographic provincialism, the distribution of a few taxa was shaped as well by environmental conditions related to agricultural management practices A statistically supported approach was used to define candidates for managementindicator organisms, subsequently validated using quantitative PCR We suggest that the ratio between the normalized abundance of a selected group of bacteria within the GP1 group of the phylum Acidobacteria and the genusRubellimicrobiumof the Alphaproteobacteria may serve as a potential managementindicator to discriminate between sustainablevs nonsustainable agricultural practices in the Pampa region Citation:Figuerola ELM, Guerrero LD, Rosa SM, Simonetti L, Duval ME, et al (2012) Bacterial Indicator of Agricultural Management for Soil under NoTill Crop Production PLoS ONE 7(11): e51075 doi:101371/journalpone0051075 Editor:Hauke Smidt, Wageningen University, The Netherlands ReceivedJune 12, 2012;AcceptedOctober 30, 2012;PublishedNovember 30, 2012 Copyright:2012 Figuerola et al This is an openaccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited Funding:The authors are members of the BIOSPAS consortium (http://wwwbiospasorg/en) ELMF, JCB, LGW and LE are members of Consejo Nacional de Investigaciones Cient?? ficas y Te? cnicas (CONICET), Argentina JAG is member of Comisio? n de Investigaciones Cient?? ficas of Buenos Aires Province, Argentina (CIC) MD and SR received fellowships from ANPCyT, Argentina LDG and LS were fellows of CONICET The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript Competing Interests:The authors have declared that no competing interests exist * Email: [email protected] These authors contributed equally to this work Introduction Sowing crop into notill soil is a farming method that has initially been developed as an alternative to conventional tillage practices, with the aims of using less fossil fuels, reducing the erosion of soils, and increasing the soil carbon pool [1] Soil structure can be significantly modified through reducedtill management practices [2] Soil aggregates are less subjected to dry and wet cycles in notilled soil, compared to conventionaltilled soil, due to the protection exerted by

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