✦ LIBER ✦

The uptake and hydrolysis of disaccharides by fast-and slow-growing species ofRhizobium

✍ Scribed by A. R. Glenn; M. J. Dilworth

Publisher: Springer
Year: 1981
Tongue: English
Weight: 557 KB
Volume: 129
Category: Article
ISSN: 0302-8933
DOI: 10.1007/bf00425257

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✦ Synopsis

Slow growing strains of rhizobia appear to lack both uptake systems and catabolic enzymes for disaccharides. In the fast-growing strains of rhizobia there are uptake mechanisms and catabolic enzymes for disaccharide metabolism. In Rhizobium leguminosarum WU163 and WU235 and R. trifolii WU290, sucrose and maltose uptake appears to be constitutive whereas in R. meliloti WU60 and in cowpea Rhizobium NGR234 uptake of these disaccharides is inducible. There is evidence that there are at least two distinct disaccharide uptake systems in fast-growing rhizobia, one transporting sucrose, maltose and trehalose and the other, lactose. Disaccharide uptake is via an active process since uptake is inhibited by azide, dinitrophenol and carbonyl cyanide m-chlorophenylhydrazone but not by arsenate. Bacteroids of R. leguminosarum WU235 and R. lupini WU8 are unable to accumulate disaccharides.

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