Plant responses to abiotic stresses and rhizobacterial biostimulants: Metabolomics and epigenetics perspectives

Motseoa M. Lephatsi, Vanessa Meyer, Lizelle A. Piater, Ian A. Dubery, Fidele Tugizimana

Research output: Contribution to journalReview articlepeer-review

36 Citations (Scopus)

Abstract

In response to abiotic stresses, plants mount comprehensive stress-specific responses which mediate signal transduction cascades, transcription of relevant responsive genes and the accumulation of numerous different stress-specific transcripts and metabolites, as well as coordinated stress-specific biochemical and physiological readjustments. These natural mechanisms employed by plants are however not always sufficient to ensure plant survival under abiotic stress conditions. Biostimulants such as plant growth-promoting rhizobacteria (PGPR) formulation are emerging as novel strategies for improving crop quality, yield and resilience against adverse environmental conditions. However, to successfully formulate these microbial-based biostimulants and design efficient application programs, the understanding of molecular and physiological mechanisms that govern biostimulant-plant interactions is imperatively required. Systems biology approaches, such as metabolomics, can unravel insights on the complex network of plant-PGPR interactions allowing for the identification of molecular targets responsible for improved growth and crop quality. Thus, this review highlights the current models on plant defence responses to abiotic stresses, from perception to the activation of cellular and molecular events. It further highlights the current knowledge on the application of microbial biostimulants and the use of epigenetics and metabolomics approaches to elucidate mechanisms of action of microbial biostimulants.

Original languageEnglish
Article number457
JournalMetabolites
Volume11
Issue number7
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Abiotic stress
  • Biostimulants
  • DNA methylation
  • Epigenetics
  • Histone modifications
  • Metabolomics
  • Plant defences
  • Plant growth-promoting rhizobacteria (PGPR)
  • Priming

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Biology

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