Blue light enhance the pigment synthesis in cyanobacterium Anabaena ambigua Rao (Nostacales)
2009
Vijaya, Velu | Anand, Narayanaswamy
Light intensity and quality are the most significant environmental factors influencing the photosynthetic pigments in Cyanobacteria. Cyanobacterium Anabaena ambigua, was subjected to different light intensities (highlight-48 W m-2, medium light-32 W m-2 and low light 16 W m-2) and different light qualities (blue, red and green light). The content of Chl a decreased with the increase in light intensity and reached the highest amount of 21% at low light 16 W m-2, whereas other biliprotein and total protein were relatively less. It was reversible in highlight 48 W m-2, except Chl 11%; the total protein 90%; phycoerythrin 4%, phycocyanin 25% and allophycocyanin 19% content were found to be relatively high. At ML and LL, PC content remained constant (21%). Since light quality seem to play an important role in regulation of pigment synthesis, Comparatively in RL and GL, 29% and 23% of PC content were found and other pigments were less than BL. Significantly all the photosynthetic pigment's content was high in blue light cells, as high as Chl a 22%, total protein 95%; phycoerythrin 11%, phycocyanin 45% and allophycocyanin 17%. Besides other light conditions, blue light triggered high photosynthetic pigments synthesis, especially high PC synthesis of this cyanobacterium.
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