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Carbon utilization by free-living and bacteroid forms of cowpea Rhizobium strain NGR234

Saroso, S., Glenn, A.R. and Dilworth, M.J. (1984) Carbon utilization by free-living and bacteroid forms of cowpea Rhizobium strain NGR234. Microbiology, 130 (7). pp. 1809-1814.

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Free-living cells of the fast-growing cowpea Rhizobium NGR234 were able to grow on a variety of carbon substrates at growth rates varying from 2.5 h on glucose or fumarate to 15.6 h on p-hydroxybenzoate. Free-living cells constitutively oxidized glucose, glutamate and aspartate but were inducible for all the other systems investigated. Bacteroids from root nodules of snake bean, however, were only capable of oxidizing C4-dicarboxylic acids and failed to oxidize any other carbon sources. Free-living cells of NGR234 possess inducible fructose and succinate uptake systems. These substrates are accumulated by active processes since accumulation is in hi bi ted by azide, 2,4-dini trop hen01 and carbonyl cyanide m-chlorophenyl hydrazone. Bacteroids failed to take up fructose although they actively accumulated succinate, suggesting that the latter substrate is significant in the development of an effective symbiosis.

Item Type: Journal Article
Murdoch Affiliation(s): School of Environmental and Life Sciences
Publisher: Society for General Microbiology
Copyright: © 1984 SGM
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