Effect of light and temperature on the cyanobacterium Arthronema africanum - a prospective phycobiliprotein-producing strain
2007
Chaneva, Ganka | Furnadzhieva, Sevdalina | Minkova, Kaledona | Lukavsky, Jaromir
The effect of light intensity (50-300 μmol photons m-² s-¹) and temperature (15-50°C) on chlorophyll a, carotenoid and phycobiliprotein content in Arthronema africanum biomass was studied. Maximum growth rate was measured at 300 μmol photons m-² s-¹ and 36°C after 96 h of cultivation. The chlorophyll a content increased along with the increase in light intensity and temperature and reached 2.4% of dry weight at 150 μmol photons m-² s-¹ and 36°C, but it decreased at higher temperatures. The level of carotenoids did not change significantly under temperature changes at illumination of 50 and 100 μmol photons m-² s-¹. Carotenoids were about 1% of the dry weight at higher light intensities: 150 and 300 μmol photons m-² s-¹. Arthronema africanum contained C-phycocyanin and allophycocyanin but no phycoerythrin. The total phycobiliprotein content was extremely high, more than 30% of the dry algal biomass, thus the cyanobacterium could be deemed an alternative producer of C-phycocyanin. A highest total of phycobiliproteins was reached at light intensity of 150 μmol photons m-² s-¹ and temperature of 36°C, C-phycocyanin and allophycocyanin amounting, respectively, to 23% and 12% of the dry algal biomass. Extremely low (<15°C) and high temperatures (>47°C) decreased phycobiliprotein content regardless of light intensity.
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