ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Ben Amar Cheba1,2 and H.M.A. Abdelzaher1,3
1Biology Department, College of Science, Jouf University, P.O. Box: 2014, Sakaka, Saudi Arabia.
2Department of Biotechnology, Faculty of Nature and Life Sciences, University of Sciences and Technology of Oran -Mohamed Boudiaf (USTOMB), BP 1505 Al Mnaouar, Oran – 31000, Algeria.
3Department of Botany and Microbiology, Faculty of Science, Minia University, Minia city, Egypt.
J Pure Appl Microbiol. 2020;14(4):2569-2575 | Article Number: 6531 | © The Author(s). 2020
Received: 13/07/2020 | Accepted: 22/10/2020 | Published: 16/11/2020

Rhizospheric soils from cultivated olive (Olea europaea) trees of Chemlali, Chetoui, Quaissi, and Djalat cultivars were assessed for their bacterial abundance and diversity and were further screened for production of exopolysaccharides and exoenzymes (cellulase, chitinase, amylase, protease, lipase, and peroxidase). The results of the present study indicate that Chetoui cultivar revealed higher diversity, followed by Chemlali > Quaissi > Djalat, wherein, bacilli, enteric bacteria, and pseudomonads were abundantly present as specific bacterial groups associated with the Chetoui rhizosphere. Moreover, the exopolysaccharide (EPS)-producing bacteria of Chetoui cultivar (68.4%) presented the highest efficiency, followed by Djalat (23.5%) > Chemlali (7 %) > Quaissi (1%). These results revealed that the Chetoui cultivar presented highest enzyme activities, followed by Chemlali > Djalat > Quaissi, with a distinct abundance of peroxidase- and chitinase-producing bacteria, which may play a pivotal role in adapting olives to the environmental stresses. From this preliminary study, we confirmed that olive rhizosphere microbial diversity is essentially driven by the geographical origin and genotype of olive cultivars. Furthermore, we recommended the Chetoui olive cultivar rhizosphere as a potential reservoir for exoenzyme- and EPS-producing bacteria useful for future biotechnological applications.


Chetoui cultivar, Diversity, Exoenzymes, Exopolysaccharide-producing bacteria, Olea europaea, Rhizosphere

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