Nodulation of the neotropical genus Calliandra by alpha or betaproteobacterial symbionts depends on the biogeographical origins of the host species

Jerri Édson Zilli (Lead / Corresponding author), Camila Pereira de Moraes Carvalho, Aline Vieira de Matos Macedo, Luis Henrique de Barros Soares, Eduardo Gross, Euan Kevin James, Marcelo Fragomeni Simon, Sergio Miana de Faria

Research output: Contribution to journalArticlepeer-review

Abstract

The neotropical genus Calliandra is of great importance to ecology and agroforestry, but little is known about its nodulation or its rhizobia. The nodulation of several species from two restricted diversity centres with native/endemic species (Eastern Brazil and North-Central America) and species widespread in South America, as well as their nodule structure and the molecular characterization of their rhizobial symbionts based on phylogeny of the 16S rRNA, recA and nodC gene, is reported herein. Species representative of different regions were grown in Brazilian soil, their nodulation observed, and their symbionts characterized. Calliandra nodules have anatomy that is typical of mimosoid nodules regardless of the microsymbiont type. The rhizobial symbionts differed according to the geographical origin of the species, i.e. Alphaproteobacteria (Rhizobium) were the exclusive symbionts from North-Central America, Betaproteobacteria (Paraburkholderia) from Eastern Brazil, and a mixture of both nodulated the widespread species. The symbiont preferences of Calliandra species are the result of the host co-evolving with the "local" symbiotic bacteria that thrive in the different edaphoclimatic conditions, e.g. the acidic soils of NE Brazil are rich in acid-tolerant Paraburkholderia, whereas those of North-Central America are typically neutral-alkaline and harbour Rhizobium. It is hypothesized that the flexibility of widespread species in symbiont choice has assisted in their wider dispersal across the neotropics.

Original languageEnglish
Number of pages16
JournalBrazilian Journal of Microbiology
Early online date10 Jul 2021
DOIs
Publication statusE-pub ahead of print - 10 Jul 2021

Keywords

  • Calliandra spp.
  • Rhizobium
  • Paraburkholderia
  • Nodulating-bacteria
  • Nodule anatomy
  • Nodulation profile

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