INFLUENCE OF pH ON THE GROWTH AND MORPHOLOGY OF ARTHROSPIRA PLATENSIS

Abstract

The growth and cellular morphology of Arthrospira platensis, a commercially important cyanobacterium, are significantly influenced by environmental pH. This study investigates the effects of varying pH levels (3, 5, 9, and 10) on the organism's biomass accumulation and structural integrity. Cultures maintained at alkaline pH, particularly 9 and 10, exhibited enhanced growth, intact trichome structure, and increased chlorophyll content, indicating optimal metabolic function. In contrast, exposure to acidic conditions, especially at pH 3, resulted in severe cellular damage, including rupture of cell walls and disorganization of internal structures, as confirmed by haematoxylin staining. These findings highlight the alkalophilic nature of A. platensis and underscore the importance of pH control in optimizing biomass production for biotechnological applications.