Abstract
We investigated the effects of three plant growth promoting rhizobacteria (PGPR), on Biological Nitrogen Fixation (BNF), nodulation and growth promotion by soybean (Glycine max) var. Osumi plants. The strains, Aur 6, Aur 9 and Cell 4, belong toPsedomonas fluorescens, Chryseobacterium balustinum andSerratia fonticola, respectively. Inoculation modes for the PGPRs andSinorhizobium fredii (carried out through irrigation), were examined. In the first mode, PGPRs andS. fredii were co-inoculated. In the second mode, we first inoculatedS. fredii and after the PGPRs, which were added 5 or 10 days later (each inoculation being an independent treatment). In the third mode, the PGPRs were inoculated first, and theS. fredii was inoculated 5 days later. We also included treatments inoculated with only the PGPRs (one PGPR per treatment) and only withS. fredii. Plants were maintained in a greenhouse under controlled environmental conditions, and were sampled 3 months after sowing. The results obtained showed the effects of the inoculation sequence. The most significant effects on growth parameters (stem plus leaf weight and fresh root weight) were found when inoculations with PGPR andS. fredii were at different times or when we inoculated only with PGPR and the plants were watered with nitrogen. Co-inoculation had no positive effects on any parameter, probably due to competition between the PGPR andS. fredii. Our results indicate that the inoculation modes with PGPR and rhizobia play a very important role in the effects produced. Thus, although plant growth promoting rhizobacteria may interact synergistically with root-nodulating rhizobia, plant growth promoting rhizobacteria selected for one crop should be assessed for potentially hazardous effects on other crops before being used as inoculants.
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Lucas García, J.A., Probanza, A., Ramos, B. et al. Effects of inoculation with plant growth promoting rhizobacteria (PGPRs) andSinorhizobium fredii on biological nitrogen fixation, nodulation and growth ofGlycine max cv. Osumi. Plant Soil 267, 143–153 (2004). https://doi.org/10.1007/s11104-005-4885-5
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DOI: https://doi.org/10.1007/s11104-005-4885-5