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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
REVIEW

Mycorrhiza induced resistance (MIR): a defence developed through synergistic engagement of phytohormones, metabolites and rhizosphere

Swapnil B. Kadam A , Anupama A. Pable B and Vitthal T. Barvkar https://orcid.org/0000-0003-4009-5924 A C
+ Author Affiliations
- Author Affiliations

A Department of Botany, Savitribai Phule Pune University, Pune-411007, India.

B Department of Microbiology, Savitribai Phule Pune University, Pune-411007, India.

C Corresponding authors. Email: bvitthal@unipune.ac.in; vbarvkar@gmail.com

Functional Plant Biology 47(10) 880-890 https://doi.org/10.1071/FP20035
Submitted: 5 February 2020  Accepted: 8 May 2020   Published: 26 June 2020

Abstract

Plants get phosphorus, water and other soil nutrients at the cost of sugar through mycorrhizal symbiotic association. A common mycorrhizal network (CMN) – a dense network of mycorrhizal hyphae – provides a passage for exchange of chemicals and signals between the plants sharing CMN. Mycorrhisation impact plants at hormonal, physiological and metabolic level and successful symbiosis also regulates ecology of the plant rhizosphere. Apart from nutritional benefits, mycorrhisation provides an induced resistance to the plants known as mycorrhiza induced resistance (MIR). MIR is effective against soil as well as foliar pathogens and pest insects. In this review, molecular mechanisms underlying MIR such as role of phytohormones, their cross talk and priming effect are discussed. Evidence of MIR against economically important pathogens and pest insects in different plants is summarised. Mycorrhiza induces many plant secondary metabolites, many of which have a role in plant defence. Involvement of these secondary metabolites in mycorrhisation and their putative role in MIR are further reviewed. Controversies about MIR are also briefly discussed in order to provide insights on the scope for research about MIR. We have further extended our review with an open ended discussion about the possibilities for transgenerational MIR.

Additional keywords: arbuscular mycorrhizal fungi, mycorrhiza induced resistance, transgenerational effects.


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