The Non-Legume Parasponia andersonii Mediates the Fitness of Nitrogen-Fixing Rhizobial Symbionts Under High Nitrogen Conditions
Simon Dupin, René Geurts, E. Toby Kiers
Abstract
is able to control nodule symbiosis in response to exogenous nitrogen. While the relative host growth benefits of inoculation decreased with nitrogen fertilization, our highest ammonium nitrate concentration (3.75 mM) was sufficient to prevent nodule formation on inoculated roots. Rhizobial populations were highest in nitrogen free medium. While we do not yet know the mechanism, our results suggest that control mechanisms over rhizobia are not exclusive to the legume clade.
Topics & Concepts
RhizobiaBiologySymbiosisNitrogen fixationBotanyRhizobiumRoot noduleActinorhizal plantBradyrhizobiumNitrogenaseInoculationHorticultureBacteriaGeneticsLegume Nitrogen Fixing SymbiosisAgronomic Practices and Intercropping SystemsCoastal wetland ecosystem dynamics