Abstract
The response of rice plants to the application of inoculant containing two Azospirillum brasilense strains was studied under field conditions. The experiment was performed as three treatments with four replicates in randomized complete blocks arranged as plots of 60 m2 in an area on a Vertic Argiudol soil type in the province of Entre Ríos, Argentina. The bacterial rhizosphere community and also the diazotrophic isolates obtained from control and inoculated rice plants were analyzed in relation to their physiology and biological nitrogen fixation (BNF). The MPN of diazotrophs in the rhizosphere varied during the ontogenic cycle. The patterns of distribution of the microbial physiological activities obtained by principal component analysis of community-level physiological profiles (CLPP) showed differences in the utilization of carbon sources by the rhizosphere communities among treatments. Although the analyses of DGGE 16S and nifH profiles have not indicated that the inoculation influenced the genetic diversity of bacterial communities among treatments, they revealed that the banding profiles were altered in different parts of the rice plant by each Azospirillum inoculation treatment. These observations suggest that physiological responses of plant tissues to the inoculation may have occurred. According to agronomic parameters of each treatment, the Azospirillum inoculation increased aerial biomass at the tillering and grain-filling stages. Although the N content accumulated in rice plants increased by 16 and 50 kg ha−1, the BNF contribution could not be estimated under our experimental conditions by the 15N balance technique. Based on this field inoculation experiment to rice plants, it is noteworthy that our data suggest that due to Azospirillum inoculation the increase of total N accumulated in rice plants could be a tool to help farmers to improve production and maintain high input of plant residues, providing more organic matter to the soil and guaranteeing sustainability of the system.
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Acknowledgements
The authors thank Mr. Daniel Mildenberger for his collaboration and dedication in conducting the field experiment. Special thanks to Dr. Raúl O. Pedraza, Dr. R.M. Boddey, Dr Jay Garland and Miss Florencia D´Auria for their valuable contribution with criticism and suggestions to this paper. We also thank the financial support for travel expenses by the cooperative project PROSUL/CNPq process n°.490286/2005-4 and Red DIMIAGRI/Acción 409AC0379 CYTED (CNPq process n° 490013/2010-4). Finally, we are grateful for the criticisms and suggestions of the anonymous reviewers which greatly contributed to the improvement of this manuscript.
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Table S1
Sequence matches for the bands excised from the 16S rDNA DGGE gels containing rice samples to sequences deposited at the GenBank (DOC 54 kb)
Fig. S1
16S rDNA DGGE profile of Gram-negative bacterial communities endophytically associated with Grains (G), Roots (R) and Aerial Part (AP) of rice plants subjected to Azospirillum brasilense strains inoculation (MI1 or MI2) and control uninoculated plants (C). Symbols indicate: Aa) Azospirillum amazonense CBAmC, 1) GC, 2) RC, 3) APC, 4) GMI1, 5) RMI1, 6) APMI1, 7) A. brasilense 40M, 8) A. brasilense 42M, 9)GMI2, 10) RMI2, 11) APMI2, P) 16S produts of reference strains: Burkholderia tropica PPe8, G. diazotrophicus PAL5, A. amazonense CBAmC, Herbaspirillum rubrisubalbicans HCC103 and H. seropedicae HRC54 (DOC 204 kb)
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García de Salamone, I.E., Di Salvo, L.P., Escobar Ortega, J.S. et al. Field response of rice paddy crop to Azospirillum inoculation: physiology of rhizosphere bacterial communities and the genetic diversity of endophytic bacteria in different parts of the plants. Plant Soil 336, 351–362 (2010). https://doi.org/10.1007/s11104-010-0487-y
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DOI: https://doi.org/10.1007/s11104-010-0487-y