Nodulation and nitrogen fixation by Mimosa spp. in the Cerrado and Caatinga biomes of Brazil

Fábio Bueno dos Reis Jr, Marcelo F. Simon, Eduardo Gross, Robert M. Boddey, Geoffrey N. Elliott, Nicolau E. Neto, M. de Fatima Loureiro, Luciano P. de Queiroz, Maria Rita Scotti, Wen-Ming Chen, Agneta Norén, Maria C. Rubio, Sergio M. de Faria, Cyril Bontemps, Silvia R. Goi, J. Peter W. Young, Janet I. Sprent, Euan K. James

Research output: Contribution to journalArticlepeer-review

Abstract

An extensive survey of nodulation in the legume genus Mimosa was undertaken in two major biomes in Brazil, the Cerrado and the Caatinga, in both of which there are high degrees of endemicity of the genus. Nodules were collected from 67 of the 70 Mimosa spp. found. Thirteen of the species were newly reported as nodulating. Nodules were examined by light and electron microscopy, and all except for M. gatesiae had a structure typical of effective Mimosa nodules. The endosymbiotic bacteria in nodules from all of the Mimosa spp. were identified as Burkholderia via immunolabelling with an antibody against Burkholderia phymatum STM815. Twenty of the 23 Mimosa nodules tested were shown to contain nitrogenase by immunolabelling with an antibody to the nitrogenase Fe- (nifH) protein, and using the 03B415N (15N natural abundance) technique, contributions by biological N2 fixation of up to 60% of total plant N were calculated for Caatinga Mimosa spp. It is concluded that nodulation in Mimosa is a generic character, and that the preferred symbionts of Brazilian species are Burkholderia. This is the first study to demonstrate N2 fixation by beta-rhizobial symbioses in the field.
Original languageEnglish
Pages (from-to)934-946
Number of pages13
JournalNew Phytologist
Volume186
Issue number4
DOIs
Publication statusPublished - Jun 2010

Bibliographical note

10.1111/j.1469-8137.2010.03267.x

Keywords

  • beta-rhizobia
  • Burkholderia
  • campo rupestre
  • Cupriavidus taiwanensis
  • nitrogenase
  • 15N natural abundance
  • Pantanal
  • NATURAL-ABUNDANCE TECHNIQUE
  • RALSTONIA-TAIWANENSIS
  • SP-NOV.
  • NODULE BACTERIA
  • ROOT-NODULES
  • BURKHOLDERIA
  • LEGUMES
  • PLANT
  • N-15
  • SYMBIONTS

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