Enhancing agriculture recovery of Phaseolus vulgaris L. and Cucurbita pepo L. with Olea europaea L. plant growth promoting rhizobacteria
R. Hadjouti
A * , H. Mohand Kaci A , F. Benzina A and J. N. Furze B C D
+ Author Affiliations
- Author Affiliations
A Laboratoire de Valorisation et Conservation des Ressources Biologiques (VALCOR), Faculté des Sciences, Département de Biologie, Université M’hamed Bougara de Boumerdes, BP35000 Boumerdes, Algeria.
B Royal Geographical Society (with the Institute of British Geographers), 1 Kensington Gore, SW7 2AR, London, UK.
C Laboratory of Biotechnology and Valorization of Natural Resources, Faculty of Sciences of Agadir, Department of Biology, Ibn Zohr University, BP 8106, 80000 Agadir, Morocco.
D Control and Systems Engineering Department, University of Technology, Alsinaah Street, P.O. Box: 19006, 10066 Baghdad, Iraq.
Soil Research 60(8) 850-863 https://doi.org/10.1071/SR21320
Submitted: 27 December 2021 Accepted: 2 April 2022 Published: 6 July 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: The rhizosphere is an environment created by interactions between root exudates and microorganisms. Interactions are beneficial due to certain components having a plant growth promoting rhizobacteria (PGPR) effect.
Aims: This study consists of the isolation, screening of PGPR from the rhizosphere of Olea europaea L. of a Mediterranean climatic region in Algeria and the study of their effects on growth of two agronomic vegetables Phaseolus vulgaris L. and Cucurbita pepo L.
Methods: Based on their ability to produce the PGPR molecules indole-3-acetic acid (IAA), phosphatase and siderophores, three rhizobacteria (S25, S75, and S79) were chosen for in vivo tests and capacity to produce the cell wall degrading enzymes chitinase, lipase, protease, glucanase, cellulase, and and phospholipase. They were also examined using scanning electron microscopy (SEM) and analysed using matrix-assisted laser desorption/ionisation time of flight mass spectrometry (MALDI-TOF MS) for identification.
Key results: Bacterial strains identified as Bacillus cereus and Bacillus thuringiensis were able to enhance significantly germination of the two vegetables at P < 0.001. Vegetative parameters of C. pepo were significantly affected by the bacterial inoculation. We noted increases in stem length (P < 0.05), number of flowers (P < 0.01), and root length (P < 0.001).
Conclusion: The bacterial isolates of this study provide biological options in treatments originating from alternate hosts.
Implications: They provide hope for companion/intercrop planting schemes, leading to optimisation of agricultural yields in agroecological blends.
Keywords: Bacillus, cell wall degrading enzymes, indole-3-acetic acid, matrix-assisted laser desorption/ionisation time of flight mass spectrometry, phosphatase, plant growth promoting rhizobacteria, siderophores.
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