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Impact of plant growth-promoting rhizobacteria on root colonization potential and life cycle of Rhizophagus irregularis following co-entrapment in alginate beads.
Velivelli, Siva L. S.
Suárez, J. P.
de Vos, P.
Doyle Prestwich, Barbara
John Wiley & Sons, Inc.
Aims: This study aimed at evaluating the impact of seven plant growth-promoting rhizobacteria (PGPR) on root colonization and life cycle of Rhizophagus irregularis MUCL 41833 when co-entrapped in alginate beads. Methods and Results: Two in vitro experiments were conducted. The first consisted of the immobilization of R. irregularis and seven PGPR isolates into alginate beads to assess the effect of the bacteria on the pre-symbiotic growth of the fungus. In the second experiment, the best performing PGPR from experiment 1 was tested for its ability to promote the symbiotic development of the AMF in potato plantlets from three cultivars. Results showed that only one isolate identified as Pseudomonas plecoglossicida (R-67094) promoted germ tube elongation and hyphal branching of germinated spores during the pre-symbiotic phase of the fungus. This PGPR further promoted the symbiotic development of the AMF in potato plants. Conclusions: The co-entrapment of Ps. plecoglossicida R-67094 and R. irregularis MUCL 41833 in alginate beads improved root colonization by the AMF and its further life cycle under the experimental conditions. Significance and Impact of the Study: Co-entrapment of suitable AMF-PGPR combinations within alginate beads may represent an innovative technology that can be fine-tuned for the development of efficient consortia-based bioformulations.
Alginate beads , AMF , Co-entrapment , Formulation , Interaction , Microbial inoculant , PGPR , Potato , Pseudomonas , Rhizophagus irregularis
Loján, P., Demortier, M., Velivelli, S. L. S., Pfeiffer, S., Suárez, J. P., de Vos, P., Doyle Prestwich, B., Sessitsch, A. and Declerck, S. (2016) 'Impact of plant growth-promoting rhizobacteria on root colonization potential and life cycle of Rhizophagus irregularis following co-entrapment in alginate beads', Journal of Applied Microbiology, 122(2), pp. 429-440. doi:10.1111/jam.13355
© 2016, the Society for Applied Microbiology. Published by John Wiley & Sons, Inc. This is the peer reviewed version of an article which has been published in final form at http://dx.doi.org/10.1111/jam.13355. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.