BIOPROSPECTION AND GENETIC DIVERSITY OF ENDOPHYTIC BACTERIA ASSOCIATED WITH CASSAVA PLANT

Authors

  • Maria Camila de Barros Silva Leite Garanhuns Academic Unit, Universidade Federal Rural de Pernambuco, Garanhuns, PE http://orcid.org/0000-0002-6056-7864
  • Arthur Prudêncio de Araujo Pereira Department of Soil Science, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP
  • Adijailton José de Souza Department of Soil Science, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP
  • Fernando Dini Andreote Department of Soil Science, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, SP
  • Fernando José Freire Department of Agronomy, Universidade Federal Rural de Pernambuco, Recife, PE
  • Júlia Kuklinsky Sobral Garanhuns Academic Unit, Universidade Federal Rural de Pernambuco, Garanhuns, PE

DOI:

https://doi.org/10.1590/1983-21252018v31n207rc

Keywords:

16S rRNA. Exopolysaccharide. Indole acetic acid. Biological nitrogen fixation. P solubilization.

Abstract

Cassava is mostly planted in sandy soils which are usually of low fertility, thereby making it necessary to perform beneficial associations with microorganisms that can promote their growth. In this perspective, the possibility of selecting bacterial isolates efficient in promoting the growth of the culture is evident, which can provide subsidies for future inoculants. The objective of this study was to isolate, identify, select and evaluate the genetic diversity of endophytic bacteria in roots and stems of cassava grown in Garanhuns - PE, with features involved in promoting plant growth. The isolation was performed on culture medium semisolid LGI-P. The selected isolates were evaluated for the potential to fix N2, as the ability to produce indole acetic acid, for their ability to solubilize inorganic phosphate and produce exopolysaccharides. Some bacterial isolates had their 16S rRNA gene sequenced by the Sanger method. A total of 52 endophytic bacteria isolates were obtained from cassava. Regarding the potential to fix N2, 15% of the isolates were positive. As for the production of IAA, 78% of the isolates produced this phytohormone in a medium with increased L-tryptophan. Approximately 31% of the isolates were able to solubilize inorganic phosphate and 60% had exopolysaccharide. The identification of 19 isolates allowed the grouping into six bacterial genera, namely: Achromobacter, Bacillus, Burkholderia, Enterobacter, Pantoea and Pseudomonas. Cassava plants grown in Garanhuns - PE present interaction with different groups of endophytic bacteria and there are bacterial groups with several characteristics involved in promoting plant growth.

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Author Biography

Maria Camila de Barros Silva Leite, Garanhuns Academic Unit, Universidade Federal Rural de Pernambuco, Garanhuns, PE

Engenheira Agrônoma formada pela Universidade Federal Rural de Pernambuco/Unidade Acadêmica de Garanhuns, Mestra em Produção Agrícola pela mesma instituição e doutoranda no programa de Pós-graduação em Ciências do Solo da Universidade Federal Rural de Pernambuco.

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Published

06-04-2018

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Section

Agronomy