MORFOFISIOLOGIA DE RIZÓBIOS ISOLADOS EM FABÁCEAS FORRAGEIRAS NATIVAS DA CAATINGA

Suelane de Melo Dias; Alberício Pereira de Andrade; Adailson Pereira de Souza; André Luiz Rodrigues Magalhães; Riselane de Lucena Alcântara Bruno; Roberta de Lima Valença

doi:10.1590/1983-21252019v32n406rc

Authors

Suelane de Melo Dias Departament of Animal Production, Universidade Federal Rural de Pernambuco, Garanhuns, PE https://orcid.org/0000-0002-3316-340X
Alberício Pereira de Andrade Departament of Animal Production, Universidade Federal Rural de Pernambuco, Garanhuns, PE https://orcid.org/0000-0002-1223-394X
Adailson Pereira de Souza Center of Agrarian Sciences, Universidade Federal da Paraíba, Areia, PB https://orcid.org/0000-0003-2049-6069
André Luiz Rodrigues Magalhães Departament of Animal Production, Universidade Federal Rural de Pernambuco, Garanhuns, PE https://orcid.org/0000-0003-2211-6795
Riselane de Lucena Alcântara Bruno Center of Agrarian Sciences, Universidade Federal da Paraíba, Areia, PB https://orcid.org/0000-0002-4206-6417
Roberta de Lima Valença Departament of Animal Production, Universidade Federal Rural de Pernambuco, Garanhuns, PE https://orcid.org/0000-0003-1341-1602

DOI:

https://doi.org/10.1590/1983-21252019v32n406rc

Keywords:

Mimosa tenuiflora. Macroptilium atropurpureum. Desmanthus pernambucanus. Diazotrophic microorganisms. Nitrogen.

Abstract

The rhizobia found in Fabaceae plants of the Caatinga may have potential as fodder in the semiarid region, thus increasing the availability of feed for animal production in this region. This study aimed to characterize the morphophysiology of rhizobia strains of the forage species Mimosa tenuiflora (Jurema preta), Macroptilium atropurpureum (Siratro), and Desmanthus pernambucanus (Jureminha). The soil used as the substrate was collected at specific locations in the municipalities of Sertânia, Arcoverde, and São Bento do Una, state of Pernambuco. The characterization of rhizobial colonies included growth period, diameter, elevation, transparency, exopolysaccharides production, and color. In addition, salinity, temperature, and pH tolerance tests of the native rhizobia were conducted. Evaluation of cultures showed that the isolates formed colonies with flat elevation, moderate production of exopolysaccharides, coloration varying from cream to white, and a smooth surface. Physiological tests of abiotic stress resistance showed that the native species isolated from M. tenuiflora were more resistant when grown in soils from the municipality of Sertânia and isolates from M. atropurpureum and D. pernambucanus had high resistance to high temperatures, regardless of place of farming. It can be concluded that native rhizobia from the Semiarid region of Pernambuco show resistance to stress caused by high temperatures, salinity variation, and pH. These characteristics are influenced by soil and the botanical species in symbiosis with the rhizobia.

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