The response of Pseudomonas putida CP1 cells to nutritional, chemical and environmental stresses |
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Authors: | ANM Fakhruddin B Quilty |
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Institution: | (1) Institute of Food and Radiation Biology, Atomic Energy Research Establishment, Ganakbari, Savar, GPO Box-3787, Dhaka, 1000, Bangladesh;(2) School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland |
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Abstract: | Summary The response of a pollutant-degrading bacterium P. putida CP1 to stresses was investigated. The growth on the mono-chlorophenols resulted in a decrease in dry weight of the organism,
although there was an increase in cell number. There was a change of bacterial shape from rod to round as well as the reduction
of cell size when grown on phenol and chlorophenols. Changes in cell shape and size were also evident in glucose-free medium,
which suggested that alteration of cell shape from rod to round as well as reduction of cell size were due to nutritional
stress. The increase in cell number but a drop in dry weight correlated with the reduction of cell size and shape. The organism
flocculated with chlorophenols but not with phenol. The cause of flocculation was due to the toxicity of chlorophenol. Isomerization
of cis to trans forms of the unsaturated fatty acids in P. putida CP1 occurred under conditions of environmental stress. Trace amounts of the polyunsaturated fatty acid linoleic acid (cis-9, cis-12-octadecadienoic acid) rarely found in bacterial membranes and oleic acid (cis-9-octadecanoic acid), which is a typical product of aerobic fatty acid synthesis, were found in P. putida CP1. |
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Keywords: | Aggregation chlorophenol phenol Pseudomonas putida response solvent stress toxicity |
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