African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5210

Full Length Research Paper

Actinomycetes from saline and non-saline soils of Saharan palm groves: Taxonomy, ecology and antagonistic properties

Salim Mokrane1, Noureddine Bouras1, Nasserdine Sabaou1* and Florence Mathieu2
1Laboratoire de Biologie des Systèmes Microbiens (LBSM), Ecole Normale Supérieure de Kouba, Alger, Algeria. 2Université de Toulouse, INPT-ENSAT, Laboratoire de Génie Chimique, UMR 5503 (CNRS/INPT/UPS), 1 Avenue de l’Agrobiopôle BP 32607 Auzeville Tolosane 31326 Castanet-Tolosan, France.
Email: [email protected]

  •  Accepted: 03 May 2013
  •  Published: 14 May 2013


This work deals with the taxonomy, ecology and antagonist properties of actinomycetesisolated from soils of 7 Saharan palm groves. These microorganisms constitute an important part of the microflora of non-saline soilsbut their density is very low in saline soilsparticularly when the electrical conductivity exceeds 4 mS/cmSalinity is the major factor governing their distribution in regularly cultivated parcelsSeven hundred and eighty nine isolates were identified for 12 genera and attached presumptively on the basis of their phenotypic characteristics to about 90 species. The taxonomy, for some predominant species, was confirmed by 16S rRNA gene sequencing. The genus Streptomyces ispredominant (59.8%), outstripping Micromonospora (25.6%), Actinomadura (4.3%),Nocardia (3.0%), Nocardiopsis (2.5%) and Amycolatopsis (1.5%)Soil salinity plays an important role in the dominance of certain species of Streptomyces from which,Streptomyces griseoincarnatus is the most frequently isolatedThe Micromonosporapredominate significantly in 6 of 28 analyzed samplesthis is due to the fact thatMicromonospora fulvoviolacea is the most common species in the genusThe study ofantagonistic properties of isolated actinomycetes showed that Fusarium oxysporum fsp.albedinispathogen of date palmis inhibited by 15.0% of isolates belonging to the genusStreptomyces.


Key words: Actinomycetes, Saharan soils, taxonomy, ecology, antagonistic properties.