Ameliorative effect of Ca 2+ on the nitrogen metabolism changes induced by salinity in Anabaena subcylindrica. | [International Journal of Agriculture and Biology • 2005]

Author(s):

1. Amal H. El-Naggar: Botany Department, Faculty of Science, Tanta University, Tanta, Egypt

2. Mohamed E. H. Osman: Botany Department, Faculty of Science, Tanta University, Tanta, Egypt

3. Mostafa M. El-Sheekh: Botany Department, Faculty of Science, Tanta University, Tanta, Egypt

4. Maha: Botany Department, Faculty of Science, Tanta University, Tanta, Egypt

5. M. F. Makled: The Technology Center for Education Development, Tanta, Egypt

Abstract:

The effect of salinity stress (0.3M NaCI) on the nitrogen metabolism of the cyanobacterium Anabaena subcylindrica (Borge) in absence or presence of CaC12 (0.03 or 0.05 M) was investigated. Salinity stress induced reduction in protein content, nitrogenase activity, some amino acids biosynthesis and nucleic acids content. On the other hand, salinity treatment stimulated the protease activity and the production of proline and cystine. Exogenous addition of CaCI2 to the culture medium alleviated the toxic action induced by salinity. The protein electrophoretic pattern of the salinized A. subcylindrica showed disappearance of some protein bands (76,42 and 39 KDa) as compared with control, presence of CaC12 in the salinized culture caused the reappearance of these bands again. At the same time, 40 KDa protein appeared in salt and salt calcium treated cells.

Page(s): 247-252

DOI: DOI not available

Published: Journal: International Journal of Agriculture and Biology, Volume: 7, Issue: 2, Year: 2005

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