296 A.C. Baraúna et al. Diversity and nitrogen fixation efficiency of rhizobia isolated from nodules of Centrolobium paraense Alexandre Cardoso Baraúna(1), Krisle da Silva(2), Gilmara Maria Duarte Pereira(3), Paulo Emílio Kaminski(2), Liamara Perin(4) and Jerri Edson Zilli(5) (1)Universidade Federal de Roraima (UFRR), Campus Cauamé, BR‑174, Km 12, Monte Cristo, CEP 69304‑000 Boa Vista, RR, Brazil. E‑mail:
[email protected] (2)Embrapa Roraima, BR‑174, Km 8, Distrito Industrial, CEP 69301‑970 Boa Vista, RR, Brazil. E‑mail:
[email protected],
[email protected] (3)UFRR, Centro de Estudo da Biodiversidade, Campus do Paricarana, Avenida Ene Garcez, no 2.413, CEP 69304‑000 Boa Vista, RR, Brazil. E‑mail:
[email protected] (4)Instituto Federal de Sergipe, Campus São Cristóvão, Rodovia BR‑101, Km 96, Povoado Quissamã, CEP 49100‑000 São Cristóvão, SE, Brazil. E‑mail:
[email protected] (5)Embrapa Agrobiologia, BR‑465, Km 7, CEP 23891‑460 Seropédica, RJ, Brazil. E‑mail:
[email protected] Abstract – The objective of this work was to isolate and characterize rhizobia from nodules of Centrolobium paraense and to evaluate their symbiotic efficiency. Soil samples collected from four sites of the Roraima Cerrado, Brazil, were used to cultivate C. paraense in order to obtain nodules. Isolates (178) were obtained from 334 nodules after cultivation on medium 79. Twenty‑five isolates belonging to six morphological groups were authenticated using Vigna unguiculata and they were characterized by 16S rRNA. Isolates identified as Bradyrhizobium were further characterized using rpoB gene sequencing.