Isolation and identification of cyanobacterial strains
Soil samples were collected from arid zones of Rajasthan, India, namely, Achrol, Jaiselmer, Man-war, and Pokharan by removing the surface debris from 4–5 randomly selected spots and scraping about 200 g soil from upper 1 cm soil layer from 0.5 ha area. After thorough mixing of soil samples, these were air dried (25–350 C, relative humidity 30–60%) and sieved and 200 g representative samples from each field were stored in polythene bags. The enrichment culture technique was utilized for deciphering cyanobac-terial populations in the arid zones (Rippka et al. 1979). For the isolation of strains from represe-ntative spots, 1 g soil sample was inoculated in 50 mL sterilized BG–11 medium in absence and presence of nitrogen (1.5 g NaNO3 L–1). Flasks were incubated for 30 days at 28 ± 20C and 3–4 K lux light intensity with cool white fluorescent light tubes under a 16/8 h light and dark cycles (Stanier et al. 1971).
Isolation and identification of cyanobacterial strains
Soil samples were collected from arid zones of Rajasthan, India, namely, Achrol, Jaiselmer, Man-war, and Pokharan by removing the surface debris from 4–5 randomly selected spots and scraping about 200 g soil from upper 1 cm soil layer from 0.5 ha area. After thorough mixing of soil samples, these were air dried (25–350 C, relative humidity 30–60%) and sieved and 200 g representative samples from each field were stored in polythene bags. The enrichment culture technique was utilized for deciphering cyanobac-terial populations in the arid zones (Rippka et al. 1979). For the isolation of strains from represe-ntative spots, 1 g soil sample was inoculated in 50 mL sterilized BG–11 medium in absence and presence of nitrogen (1.5 g NaNO3 L–1). Flasks were incubated for 30 days at 28 ± 20C and 3–4 K lux light intensity with cool white fluorescent light tubes under a 16/8 h light and dark cycles (Stanier et al. 1971).
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