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Analysis of the Cultivable Endophytic Bacterial Diversity in the Date Palm (Phoenix dactylifera L.) and Evaluation of Its Antagonistic Potential against Pathogenic Fusarium Species that Cause Date Palm Bayound Disease

Rayda Siala, Ines Ben Chobba, Tatiana Vallaeys, Mohamed Ali Triki, Mouna Jrad, Manel Cheffi, Imen Ayedi, Amine Elleuch, Ahmad Nemsi, Frederique Cerqueira, Radhouane Gdoura, Noureddine Drira, Néji Gharsallah

Journal of Applied & Environmental Microbiology. 2016, 4(5), 93-104 doi:10.12691/jaem-4-5-2
  • Figure 1. Phylogenetic tree of strains isolated from date palm and related species based on 16S rDNA sequences by the maximum parsimony analysis. The bootstrap percentages of more than 50% are shown above each branch. a. The Bacilliaceae with Bacillus lentus as the outgroup, b. The Alcaligenaceae with Achromobacter denitrificans as the outgroup, c. The Microbacteriacea with Microbacterium flavescens as the outgroup, d. The Micrococcaceae with Arthrobacter roseus as the outgroup, e. The Enterobacteriaceae with Serratia liquefaciens as the outgroup, f. The Moraxellaceae with Acinetobacter gerneri as the outgroup and g. The Pseudomonadaceae with Pseudomonas putida as the outgroup
  • Figure 2. Antagonistic effect of bacterial palm endophytes (A) A. agilis and (B) B. sublilis on Fusaria as evaluated by dual-culture on PDA medium after 7 days. (a) Fusarium solani from potato tree, (b) Fusarium oxysporum from olive tree and (c) Fusarium oxysporum from palm date tree
  • Figure 3. Growth inhibition (%) of different Fusarium spp (Fo: Fusarium oxysporum, Fs: Fusarium solani and Foa: Fusarium oxysporum f. sp. albidinis) induced by palm endophytic bacterial isolates (1: Acinetobacter calcoaceticus; 2: Arthrobacter agilis; 3: Achromobacter piechaudii; 4: Serratia nematodiphila; 5: Pseudomonas sp; 6: Microbacterium aerolatum; 7: Microbacterium barkeri; 8: Serratia rubidaea; 9: Bacillus cereus; 10: Bacillus subtilis; 11: Bacillus safensis and 12: Bacillus sonorensis using the dual culture methods. Percentages were determinate (a) after 7 days and (b) after 15 days incubation