ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Abdessamad Sallami1 , Farid Rachidi1, Abdelali Idrissi Lahsini1, Hanane El Khedri1, Allal Douira2, Cherkaoui El Modafar3, Leila Medraoui1 and Abdelkarim Filali-Maltouf1
1Laboratory of Microbiology and Molecular Biology, Center of Plant and Microbial Biotechnology, Biodiversity and Environment, Faculty of Sciences, Mohammed-V University in Rabat, Morocco.
2Laboratory of Botany, Biotechnology and Plant Protection, Faculty of Sciences, University Ibn Tofail, Kenitra, Morocco.
3Agro-biotechnology and Bio-engineering Center, CNRST Labeled Research Unit (URL-CNRST 05), Gueliz Faculty of Science and Technology, Cadi Ayyad University, Marrakech, Morocco.
Article Number: 8608 | © The Author(s). 2023
J Pure Appl Microbiol. 2023;17(4):2165-2178. https://doi.org/10.22207/JPAM.17.4.13
Received: 07 April 2023 | Accepted: 13 September 2023 | Published online: 23 October 2023
Issue online: December 2023
Abstract

Plant Growth Promoting Rhizobacteria (PGPR) play an essential role in enhancing plant growth, health and yield. In this study, we describe the isolation of PGPR associated with the olive tree (Olea europaea L.) grown in three Moroccan regions of Zouala, Errachidia, and Essaouira. In these regions, we isolated 95 PGPRs from rhizosphere of Olive trees, 78% of them were characterized by their tolerance to a salinity of 4-11%. We also found that 39% of these PGPRs were phosphate solubilizing bacteria (PSB) with a solubilization ability greater than 100 µg/mL. In fact, Pantoea agglomerans (MRC_ZO_17) and Enterobacter ludwigii (MRC_ZO_97), showed the highest phosphate solubilization rates of ~450 µg/mL and ~196 µg/mL, respectively. In addition to their ability to solubilize phosphate, various isolates had the ability to produce Indole-3-acetic acid (IAA). For instance, E. ludwigii (MRC_ZO_97) had an IAA production of ~60.48 g/mL. In the region of Zouala, characterized by relatively higher salinity and lower rate of organic matter, Firmicutes isolates account for 87% of the isolated rhizobacteria. Interestingly, we found that the olive tree-associated PGPRs vary significantly between the three sampled regions. Several rhizobacteria isolated in this study are excellent candidates for formulation as bioinocula for plants in saline soils.

Keywords

PGPR, Rhizosphere Soil, Diversity, Olive, Phosphate Solubilization, Abiotic Stress

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© The Author(s) 2023. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.