Responses of Dunaliella bardawil and Chlorella ellipsoidea to pH stress

Khalil, Z. and Asker, M. and El-Sayed, S. and Kobbia, I. (2010) Responses of Dunaliella bardawil and Chlorella ellipsoidea to pH stress. Acta Botanica Hungarica, 52 (1-2). pp. 123-135. ISSN 0236-6495

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Abstract

In this study, two green microalgae, Dunaliella bardawil and Chlorella ellipsoidea , are exposed to different pH values. The two tested microalgae could grow in a wide range of pH (4–9 for D. bardawil and 4–10 for C. ellipsoidea ). The dry weight gain and the biochemical components of D. bardawil were greatly enhanced at pH 7.5. On the contrary, dry weight and carbohydrate content of C. ellipsoidea attained their maximum values at the alkaline pH. On the other hand, the protein content of C. ellipsoidea recorded its highest value at pH 4, while the pigment content of the same alga highly accumulated at pH 4, 6 and 7.5 and decreased as pH directed to the alkaline side. Both pH 6 and pH 9 stimulated the accumulation of vitamin E and vitamin C in D. bardawil , with the highest values of the three compounds recorded at pH 9. In case of C. ellipsoidea , β-carotene content increased at pH 6 and 10 as compared with control, but the amount of β-carotene was much higher at pH 6 than at pH 10. Contrarily, vitamin E was highly accumulated in C. ellipsoidea cells at pH 10 than at pH6. BothpH6 andpH10 caused a significant decline in vitaminCcontent in C. ellipsoidea .

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