Ann. Limnol. - Int. J. Lim.
Volume 45, Number 2, 2009
|Page(s)||119 - 125|
|Published online||27 May 2009|
Carotenoids and pH of the culture medium play an important role in displaying metal stress in batch and semi-continuous cultures of Anabaena doliolum
Department of Bioscience and Biotechnology, Banasthali University, Banasthali, 304022, Rajasthan, India
2 Department of Botany, Banaras Hindu University, Varanasi, 221005, India
Corresponding author: email@example.com
Accepted: 5 February 2009
We analysed the responses of Anabaena doliolum to elevated levels of copper and zinc in batch and semi-continuous cultures. Approximately 10, 4 and 8 and 5-times greater inhibition in final yield of A. doliolum occurred at 1, 2 μM Cu and 2.5 and 5 μM of Zn, respectively, in semi-continuous culture in comparison to batch culture. Protein, chlorophyl a and carotenoid contents of A. doliolum showed significantly (P < 0.05) higher inhibition by test metals in semi-continuous culture than in batch culture. The greater sensitivity of different parameters of the test organism was related to the high metal content of the cells grown in semi-continuous system. Moreover, enhancement of pH of the culture suspension in batch culture showed a negative relationship with metal accumulation, and therefore with toxicity. This was due to decrease in free ionic concentrations of test metals. Carotenoids acted as a metal detoxifying agent by minimizing metal-induced inhibition in batch culture as was evident from its negative relationship with metal toxicity.
Key words: Anabaena doliolum / batch culture / carotenoids / copper / pH / semi-continuous culture / zinc
© EDP Sciences, 2009
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