Cell Death Mechanisms in Plant Defense Responses

Plants deploy a spectrum of regulated cell death programmes to contain invading pathogens and safeguard neighbouring tissues. Central to this defence is the hypersensitive response, in which cells at the site of infection undergo rapid, localized suicide to restrict microbial spread. This process is orchestrated by an intricate network of signals, notably reactive oxygen species that both directly damage pathogens and act as secondary messengers to activate defence genes. Key signalling modules include mitogen-activated protein kinase cascades and hormone pathways involving salicylic acid, jasmonic acid and cytokinins, which integrate external cues and modulate cell death thresholds. Subcellular compartments such as chloroplasts and mitochondria contribute to death initiation through photosynthetic electron leakage and cytochrome c release, respectively. Genetic studies of lesion mimic mutants have uncovered components of ubiquitin-proteasome and vesicular trafficking systems that fine-tune death signalling and immunity. Collectively, these mechanisms form a coordinated barrier to pathogen ingress and have profound implications for crop resilience. Understanding the molecular choreography of plant cell death furthers our capacity to engineer disease-resistant varieties and informs sustainable strategies for global food security.

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Cell Death Mechanisms in Plant Defense Responses publication trend

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Technical terms

Hypersensitive response (HR): rapid, localized cell death that restricts pathogen spread at infection sites.

Lesion mimic mutants (LMM): plants exhibiting spontaneous necrotic spots in the absence of pathogens, used to dissect PCD pathways.

Reactive oxygen species (ROS): highly reactive oxygen derivatives that serve as both antimicrobial agents and signalling molecules in defence.

Programmed cell death (PCD): genetically regulated cellular suicide that eliminates compromised cells and limits pathogen proliferation.

Mitogen-activated protein kinase (MAPK) cascade: a series of phosphorylating enzymes that transmit stress and immune signals to elicit defence responses.

References

1. OsMKK6 Regulates Disease Resistance in Rice. International Journal of Molecular Sciences (2023).
2. Integration of transcriptomics, metabolomics, and hormone analysis revealed the formation of lesion spots inhibited by GA and CTK was related to cell death and disease resistance in bread wheat (Triticum aestivum L.). BMC Plant Biology (2024).
3. The RhoGAP SPIN6 Associates with SPL11 and OsRac1 and Negatively Regulates Programmed Cell Death and Innate Immunity in Rice. PLOS Pathogens (2015).
4. The Multivesicular Bodies (MVBs)-Localized AAA ATPase LRD6-6 Inhibits Immunity and Cell Death Likely through Regulating MVBs-Mediated Vesicular Trafficking in Rice. PLOS Genetics (2016).
5. The Rice Dynamin-Related Protein OsDRP1E Negatively Regulates Programmed Cell Death by Controlling the Release of Cytochrome c from Mitochondria. PLOS Pathogens (2017).