Pleiotropic effects of purine auxotrophy inRhizobium meliloti on cell surface molecules |
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Authors: | Swamynathan S K Singh Aqbal |
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Institution: | (1) Biotechnology Centre, Indian Agricultural Research Institute, 110 012 New Delhi, India;(2) Present address: Centre for Cellular and Molecular Biology, 500 007 Hyderabad, India |
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Abstract: | Rhizobial purine auxotrophs have earlier been shown to be defective in symbiosis, though the exact reason for this failure
is not clear. Using various dyes that specifically bind different cell surface molecules, we show that there are multiple
changes in the cell surface molecules associated with different purine auxotrophs. Affected molecules in different purine
auxotrophs that were tested include (i) acidic exopolysaccharides, (ii) cellulose fibrils, and (iii) beta (1–3) glucans. Our
results show that the symbiotic deficiency of purine auxotrophs is likely to be a result of these associated changes on the
cell surface |
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Keywords: | Rhizobium meliloti Medicago saliva purine biosynthesis exopolysaccharides symbiosis |
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