{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T22:23:43Z","timestamp":1791066223730,"version":"4.1.0"},"reference-count":66,"publisher":"Canadian Science Publishing","issue":"3","license":[{"start":{"date-parts":[[2013,3,1]],"date-time":"2013-03-01T00:00:00Z","timestamp":1362096000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. Microbiol."],"published-print":{"date-parts":[[2013,3]]},"abstract":"<jats:p>Rhizosphere bacteria were isolated from Costularia spp., pioneer sedges from ultramafic soils in New Caledonia, which is a hotspot of biodiversity in the South Pacific. Genus identification, ability to tolerate edaphic constraints, and plant-growth-promoting (PGP) properties were analysed. We found that 10<jats:sup>5<\/jats:sup>colony-forming units per gram of root were dominated by Proteobacteria (69%) and comprised 21 genera, including Burkholderia (28%), Curtobacterium (15%), Bradyrhizobium (9%), Sphingomonas (8%), Rhizobium (7%), and Bacillus (5%). High proportions of bacteria tolerated many elements of the extreme edaphic conditions: 82% tolerated 100 \u03bcmol\u00b7L<jats:sup>\u20131<\/jats:sup>chromium, 70% 1 mmol\u00b7L<jats:sup>\u20131<\/jats:sup>nickel, 63% 10 mmol\u00b7L<jats:sup>\u20131<\/jats:sup>manganese, 24% 1 mmol\u00b7L<jats:sup>\u20131<\/jats:sup>cobalt, and 42% an unbalanced calcium\/magnesium ratio (1\/16). These strains also exhibited multiple PGP properties, including the ability to produce ammonia (65%), indole-3-acetic acid (60%), siderophores (52%), and 1-aminocyclopropane-1-carboxylate (ACC) deaminase (39%); as well as the capacity to solubilize phosphates (19%). The best-performing strains were inoculated with Sorghum sp. grown on ultramafic substrate. Three strains significantly enhanced the shoot biomass by up to 33%. The most successful strains influenced plant nutrition through the mobilization of metals in roots and a reduction of metal transfer to shoots. These results suggest a key role of these bacteria in plant growth, nutrition, and adaptation to the ultramafic constraints.<\/jats:p>","DOI":"10.1139\/cjm-2012-0570","type":"journal-article","created":{"date-parts":[[2012,11,29]],"date-time":"2012-11-29T15:03:03Z","timestamp":1354201383000},"page":"164-174","source":"Crossref","is-referenced-by-count":16,"title":["Rhizosphere bacteria of<i>Costularia<\/i>spp. from ultramafic soils in New Caledonia: diversity, tolerance to extreme edaphic conditions, and role in plant growth and mineral nutrition"],"prefix":"10.1139","volume":"59","author":[{"given":"Mathieu","family":"Gonin","sequence":"first","affiliation":[{"name":"Institut de recherche pour le d\u00e9veloppement (IRD), Laboratoire des symbioses tropicales et M\u00e9diterran\u00e9ennes (LSTM UR040), B.P. 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