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Microbial interaction mediated programmed cell death in plants

  • Review Article
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Abstract

Food demand of growing population can only be met by finding solutions for sustaining the crop yield. The understanding of basic mechanisms employed by microorganisms for the establishment of parasitic relationship with plants is a complex phenomenon. Symbionts and biotrophs are dependent on living hosts for completing their life cycle, whereas necrotrophs utilize dead cells for their growth and establishment. Hemibiotrophs as compared to other microbes associate themselves with plants in two phase’s, viz. early bio-phase and later necro-phase. Plants and microbes interact with each other using receptors present on host cell surface and elicitors (PAMPs and effectors) produced by microbes. Plant–microbe interaction either leads to compatible or incompatible reaction. In response to various biotic and abiotic stress factors, plant undergoes programmed cell death which restricts the growth of biotrophs or hemibiotrophs while necrotrophs as an opportunist starts growing on dead tissue for their own benefit. PCD regulation is an outcome of plant–microbe crosstalk which entirely depends on various biochemical events like generation of reactive oxygen species, nitric oxide, ionic efflux/influx, CLPs, biosynthesis of phytohormones, phytoalexins, polyamines and certain pathogenesis-related proteins. This phenomenon mostly occurs in resistant and non-host plants during invasion of pathogenic microbes. The compatible or incompatible host–pathogen interaction depends upon the presence or absence of host plant resistance and pathogenic race. In addition to host–pathogen interaction, the defense induction by beneficial microbes must also be explored and used to the best of its potential. This review highlights the mechanism of microbe- or symbiont-mediated PCD along with defense induction in plants towards symbionts, biotrophs, necrotrophs and hemibiotrophs. Here we have also discussed the possible use of beneficial microbes in inducing systemic resistance in plants against pathogenic microbes.

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Abbreviations

PAMP:

Pathogen-associated molecular patterns

PRRs:

Pattern recognition receptors

PCD:

Programmed cell death

ROS:

Reactive oxygen species

SA:

Salicylic acid

JA:

Jasmonic acid

HR:

Hypersensitive response

ETI:

Effector triggered immunity

PTI:

PAMP triggered immunity

NBS-LRR:

Nucleotide binding site-Leucine rich repeat

Ss-Rhs1:

Sclerotinia sclerotiorum Rearrangement hotspot 1

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Contributions

LP conceived the idea of review. LP, SK and SS wrote and designed the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Lakshman Prasad.

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There is no conflict of interest regarding the publication of this article.

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Prasad, L., Katoch, S. & Shahid, S. Microbial interaction mediated programmed cell death in plants. 3 Biotech 12, 43 (2022). https://doi.org/10.1007/s13205-021-03099-7

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  • DOI: https://doi.org/10.1007/s13205-021-03099-7

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