Investigations on rhizoplane actinobacteria communities of Papyrus (Cyperus papyrus) from an Egyptian wetland

Rifaat, H. M. and Márialigeti, K. and Kovács, G. (2002) Investigations on rhizoplane actinobacteria communities of Papyrus (Cyperus papyrus) from an Egyptian wetland. Acta Microbiologica et Immunologica Hungarica, 49 (4). pp. 423-432. ISSN 1217-8950

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Abstract

Wetlands have important global ecological functions, which include carbon storage and water interception. Wetland contributes to the maintenance of regional and global biodiversity. Though many importnat wetland ecological funcions are based on microbial metabolism, we have scanty knowledge on microbial diversity in wetlands. Plant thizoplane habitats are considered to harbor highly diverse bacterial communities. Most of the floating mats on river Nile are dominated by papyrus (Cyperus papyrus). Papyrus root samples were collected from a floating mat at the "Gold Island" inside the Nile River at Cairo, Egypt in February 1996 and May 1997 in order to investigate the rhizoplane actinobacteria communities. The root-tip regions were cu off, repeatedly washed, macerated and plated. Using the plate-count technique with three actinobacteria media, an average of 2.1x104 CFUg-1 root actinobacteria were obtained. All actinobacteria colonies were isolated, purified and investigated by classical and molecular methods. In the papyrus rhizoplane Streptomyces anulatus, Micromonospora sp., Rhodococcus luteus, Verrucosispora gifhornensis and Aureobacterium liquefaciens dominated, moreover Actinoplanes utahensis, and Str. diastaticus were also present. The physiological traits of the members of dominant groups revealed that these bacteria might be active in the rhizoplane and can be present there in their vegetative forms.

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