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Genome editing for resistance against plant pests and pathogens

  • GENOME EDITING IN PLANTS
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Abstract

The conventional breeding of crops struggles to keep up with increasing food needs and ever-adapting pests and pathogens. Global climate changes have imposed another layer of complexity to biological systems, increasing the challenge to obtain improved crop cultivars. These dictate the development and application of novel technologies, like genome editing (GE), that assist targeted and fast breeding programs in crops, with enhanced resistance to pests and pathogens. GE does not require crossings, hence avoiding the introduction of undesirable traits through linkage in elite varieties, speeding up the whole breeding process. Additionally, GE technologies can improve plant protection by directly targeting plant susceptibility (S) genes or virulence factors of pests and pathogens, either through the direct edition of the pest genome or by adding the GE machinery to the plant genome or to microorganisms functioning as biocontrol agents (BCAs). Over the years, GE technology has been continuously evolving and more so with the development of CRISPR/Cas. Here we review the latest advancements of GE to improve plant protection, focusing on CRISPR/Cas-based genome edition of crops and pests and pathogens. We discuss how other technologies, such as host-induced gene silencing (HIGS) and the use of BCAs could benefit from CRISPR/Cas to accelerate the development of green strategies to promote a sustainable agriculture in the future.

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Abbreviations

BCA:

Biocontrol agent

Cas9:

CRISPR-associated protein 9

CRISPR:

Clustered regularly interspaced short palindromic repeats

DAMPs:

Damage-associated molecular patterns

dsRNA:

Double-stranded RNA

ET:

Ethylene

ETI:

Effector-trigged immunity

ETS:

Effector-trigger susceptibility

GE:

Genome editing

gRNA:

Guide RNA

HIGS:

Host-induced gene silencing

HR:

Hypersensitive response

JA:

Jasmonic acid

MAPK:

Mitogen activated protein kinase

NB-LRR:

Nucleotide-binding leucine-rich repeat protein

PAMPs:

Pathogen-associated molecular patterns

PCD:

Programmed cell death

PR:

Pathogenesis-related

PRR:

Pattern recognition receptor

PTI:

Pattern-triggered immunity

R:

Resistance

RLK:

Receptor-like kinase

RNAi:

RNA interference

RNP:

Ribonucleoprotein

S:

Susceptibility

SA:

Salicylic acid

sRNA:

Small RNA

TAL:

Transcription activator-like

TALEN:

Transcription activator-like effector nuclease

TF:

Transcription factor

TIR:

Toll/interleukin-1 receptor

VIGS:

Virus‐induced gene silencing

ZFN:

Zinc finger nuclease

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Acknowledgements

We are grateful to all the researchers whose contributions have been cited, which have helped us to prepare this review paper. We apologize to those authors whose excellent work could not be cited due to space limitations.

Funding

This review was funded by the European Social Fund (ALT20-05-3559-FSE-000036) and the Fundação para a Ciência e Tecnologia (FCT) based on RCM 23/2018 March, 8.

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Authors

Contributions

All authors participated in literature gathering and manuscript writing. CA designed the figures in collaboration with the other authors.

Corresponding authors

Correspondence to Cristina Azevedo or Paula Rodrigues Oblessuc.

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The authors declare that there is no conflict of interest.

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Rato, C., Carvalho, M.F., Azevedo, C. et al. Genome editing for resistance against plant pests and pathogens. Transgenic Res 30, 427–459 (2021). https://doi.org/10.1007/s11248-021-00262-x

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  • DOI: https://doi.org/10.1007/s11248-021-00262-x

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