Hydroxamate siderophores of root nodule bacteria
Identifieur interne : 002024 ( Istex/Checkpoint ); précédent : 002023; suivant : 002025Hydroxamate siderophores of root nodule bacteria
Auteurs : Kerry C. Carson [Australie] ; Jean-Marie Meyer [France] ; Michael J. Dilworth [Australie]Source :
- Soil Biology and Biochemistry [ 0038-0717 ] ; 2000.
Descripteurs français
- Wicri :
- topic : Biochimie.
English descriptors
- KwdEn :
- Aircs, Assay, Biochemistry, Bradyrhizobia, Bradyrhizobium, Carson, Citrate, Complexed, Dihydroxamate, Dihydroxamate siderophores, Dilworth, Ferric, Final cell, Guerinot, Hydroxamate, Inoculant, Iron concentration, Iron concentrations, Iron transport, Japonicum, Leguminosarum, Meliloti, Meliloti strains, Microbiology, Nodule, Perchlorate, Persmark, Positive reaction, Reagent, Rhizobactin, Rhizobium, Rhizobium leguminosarum, Rhizobium meliloti, Root nodule bacteria, Sativa, Siderophore, Siderophore producers, Siderophore production, Siderophores, Soil biology biochemistry, Supernatant, Trifolii, Trihydroxamate, Trihydroxamate siderophore, Trihydroxamate siderophores, Trihydroxamates, Tropici, Viciae, Vicibactin.
- Teeft :
- Aircs, Assay, Biochemistry, Bradyrhizobia, Bradyrhizobium, Carson, Citrate, Complexed, Dihydroxamate, Dihydroxamate siderophores, Dilworth, Ferric, Final cell, Guerinot, Inoculant, Iron concentration, Iron concentrations, Japonicum, Leguminosarum, Meliloti, Meliloti strains, Microbiology, Nodule, Perchlorate, Persmark, Positive reaction, Reagent, Rhizobactin, Rhizobium, Rhizobium leguminosarum, Rhizobium meliloti, Root nodule bacteria, Sativa, Siderophore, Siderophore producers, Siderophore production, Siderophores, Soil biology biochemistry, Supernatant, Trifolii, Trihydroxamate, Trihydroxamate siderophore, Trihydroxamate siderophores, Trihydroxamates, Tropici, Viciae, Vicibactin.
Abstract
Abstract: Sixty strains of root nodule bacteria were screened for siderophore production in low-iron broth, among them 40 strains from the Australian Inoculants Research and Control Service (AIRCS) which are the current commercial inoculants used in the pulse and legume pasture industries in Australia. Eleven new siderophore-producing strains were recognised including Sinorhizobium meliloti (WSM826, WSM352, SU47), Rhizobium leguminosarum biovar viciae (WU163, MNF3841, SU391), Rhizobium leguminosarum biovar trifolii (CB782, CC2483g, CC283b) and Rhizobium tropici (WSM1385, CB3060). Siderophores were identified by chemical characterisation for catecholate or hydroxamate, spectral studies, isoelectrofocusing and siderophore-mediated iron-uptake studies. The S. meliloti strains all produced dihydroxamate siderophores. Other siderophore-producing rhizobia, with the exception of R. tropici CB306c, excreted trihydroxamate-type siderophores. No bradyrhizobia were Chromazurol S-positive. 59Fe uptake studies revealed that all strains transported iron complexed to citrate. The sinorhizobia took up 5–10-fold more iron from dihydroxamate than trihydroxamate siderophores. Conversely, other rhizobia and the slow-growing bradyrhizobia transported iron complexed to trihydroxamates at rates 2–5 fold those of dihydroxamate siderophores. Rhizobactin 1021 was excreted by S. meliloti strains 1021, Rm2011 and SU47 and vicibactin by seven strains of R. leguminosarum (bv. viciae and bv. trifolii).
Url:
DOI: 10.1016/S0038-0717(99)00107-8
Affiliations:
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<front><div type="abstract" xml:lang="en">Abstract: Sixty strains of root nodule bacteria were screened for siderophore production in low-iron broth, among them 40 strains from the Australian Inoculants Research and Control Service (AIRCS) which are the current commercial inoculants used in the pulse and legume pasture industries in Australia. Eleven new siderophore-producing strains were recognised including Sinorhizobium meliloti (WSM826, WSM352, SU47), Rhizobium leguminosarum biovar viciae (WU163, MNF3841, SU391), Rhizobium leguminosarum biovar trifolii (CB782, CC2483g, CC283b) and Rhizobium tropici (WSM1385, CB3060). Siderophores were identified by chemical characterisation for catecholate or hydroxamate, spectral studies, isoelectrofocusing and siderophore-mediated iron-uptake studies. The S. meliloti strains all produced dihydroxamate siderophores. Other siderophore-producing rhizobia, with the exception of R. tropici CB306c, excreted trihydroxamate-type siderophores. No bradyrhizobia were Chromazurol S-positive. 59Fe uptake studies revealed that all strains transported iron complexed to citrate. The sinorhizobia took up 5–10-fold more iron from dihydroxamate than trihydroxamate siderophores. Conversely, other rhizobia and the slow-growing bradyrhizobia transported iron complexed to trihydroxamates at rates 2–5 fold those of dihydroxamate siderophores. Rhizobactin 1021 was excreted by S. meliloti strains 1021, Rm2011 and SU47 and vicibactin by seven strains of R. leguminosarum (bv. viciae and bv. trifolii).</div>
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