The impact of the rhizobia–legume symbiosis on host root system architecture

Cristóbal Concha Vidal, Peter Doerner

Research output: Contribution to journalReview articlepeer-review

Abstract

Legumes form symbioses with rhizobia to fix N2 in root nodules to supplement their nitrogen (N) requirements. Many studies have shown how symbioses affect the shoot, but far less is understood about how they modify root development and root system architecture (RSA). RSA is the distribution of roots in space and over time. RSA reflects host resource allocation into below-ground organs and patterns of host resource foraging underpinning its resource acquisition capacity. Recent studies have revealed a more comprehensive relationship between hosts and symbionts: the Latter can affect host resource acquisition for phosphate and iron, and the symbiont’s production of plant growth regulators can enhance host resource flux and abundance. We review the current understanding of the effects of rhizobia-legume symbioses on legume root systems. We focus on resource acquisition and allocation within the host to conceptualise the effect of symbioses on RSA, and highlight opportunities for new directions of research.
Original languageEnglish
Pages (from-to)3902–3921
Number of pages20
JournalJournal of Experimental Botany
Volume71
Issue number13
Early online date27 Apr 2020
DOIs
Publication statusPublished - 26 Jun 2020

Keywords

  • legumes
  • nutrition
  • rhizobia
  • symbiosis
  • roots
  • root system architecture

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