Growth performance and Akinete formation of N2-fixing cyanobacteria
2004
Somporn Choonluchanon(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Soil Science and Conservation) | Eaktida Chairin(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Soil Science and Conservation) | Chutimon Sathirapipatkul(Chulalongkorn University, Bangkok (Thailand). Faculty of Engineering. Dept. of Chemical Engineering)
Six isolates of soil isolated cyanobacteria were selected to study on growth characteristic and akinete formation. The tested isolates were evaluated in BG11 nitrogen depleted medium under 4,000 lux of light intensity at 25 deg C. Growth performances were evaluated within 12 hours intervals for 48 hours and at 3, 6, 12, 18 and 21 days after inoculation. The results indicated that dry biomass of cyanobacteria dramatically increased within 18 days and decreased thereafter. Significant differences on dry biomass were not found among the tested cyanobacteria. The chlorophyll and protein contents of most cyanobacteria continuously increased by cultivation period. The maximum cell number (10**(9) cell/mL) of Nostoc sp. 6CCR1-1 was obtained within 12 days while the others at 18-21 days. The most interesting point of view of this study was the akinete formation of the Nostoc sp. 6CCR1-1 cultivated in BG11 with 5, 10 and 15 mg/L of phosphorous under light intensity of 2,000 and 4,000 lux. Akinete formation of cyanobacteria was found significantly higher under cultivation in the medium containing 15 mg/L of phosphorous and light intensity of 4,000 lux. At the same time of akinetes increment, the heterocyst cells were found decreasing. This evidence indicated that low requirement of nitrogen for growth of cyanobacteria was observed during the vegetative cells being developed to be akinetes.
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