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Moss Rhizosphere and Its Microflora

M. R. Khan
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

S. M. Imamul Huq
Department of Soil Science, University of Dhaka, Dhaka-1000, Bangladesh

Md. Hasanuzzaman
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

Microorganisms associated with the rhizosphere of mosses were isolated. From the initiated isolation of 84 bacterial and 24 actinomycetes strains: 15 bacterial and 8 antinomycetes strains were selected and studied. The organism included Bacillus, Sporolactobacillus, Micrococcus, Paracoccus, Frankia, Intransporangium, Micromonospora. Promicromonospora and Streptomyces. In vitro experiments showed positive stimulation of some of the bactcrial isolates by the extract of rhizoids. Major components of the tested rhizosphere soil viz. organic matter total nitrogen, available phos-phorus and potassium were also measured and reported.

Keywords: Rhizophere, Moss micronora.

Location: Dhaka Metropolitan City and Netrokona town, Bangladesh

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Commodity: Medicinal Plants

Objectives:

To determine the moss Rhizosphere and its Microflora.

Methodology:

Soil samples were collected from rhizosphere of mosses at different times from different places of Dhaka Metropolitan City and Netrokona town. The temperature of the rhizosphere soil sample as well as ambient temperature was recorded . The pH and moisture content of each soil sample were determined in the laboratory. After drying the soil samples were passed through a 0.5 mm sieve and organic matter content, total nitrogen, available phosphorus and available potassium were determined. Serial dilution 'technique was followed for the isolation of microorganisms from the rhizosphere soil samples and direct inoculation of rhizoids were also done using different culture media viz. nutrient agar medium for bacteria, Oat meal agar, starch casein agar, yeast and malt extract agar media were used for actinomycetes. The R. S. ratio for bacteria were also determined. The selected isolates were screened by physiological and biochemical tests including IMViC. Catalan test, casein hydrolysis, tyrosine decomposition, nitrate reduction. Growth responses were recorded at different environmental condition viz. temperature, pH and NaCI concentration. Bergeys Manual of Systematic Bacteriology was followed for the identification of the selected strains.

Source of Information: Bangladesh J. Bot. 26(2) : 163- 168, 1997 (December)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The constant and dynamic phenomenon is not only effected by selection pressures like nutrient supply temperature and moisture but also by the important role of microbes. Lately when environmental scientist are showing increasing concern about pollution and scientists are working on the ability of mosses to clear our environment, the moss rhizosphere should be examined more closely and carefully to have an insight of the pollutant-microbe interaction which could possibly help us in a better understanding of the problem of pollution management, beside biogeochemical transformation so closely related with plant succession. The purpose of the work described here was to study the composition and nature of the moss rhizosphere along with its microflora.

Knowledge Management: Journal