Plant Pathogen Interactions in Brassica Species and Brassicaceae

Brassica species and their wild relatives in the Brassicaceae family are foundational to global agriculture and human nutrition, yet they are continually challenged by a diverse array of pathogens, including fungi, oomycetes and bacteria. The interplay between host and pathogen is governed by multilayered defence systems: an initial pattern‐triggered immunity that recognises conserved microbial signatures, followed by effector‐triggered immunity mediated by resistance proteins that detect specific pathogen secretions. Central to these responses are phytohormone networks—particularly salicylic acid, jasmonic acid and ethylene—which fine-tune local and systemic defences. Pathogens counter these defences by deploying effector proteins, toxins and cell-wall–degrading enzymes to suppress immunity, extract nutrients and facilitate colonisation. Advances in genomics, transcriptomics and molecular diagnostics have elucidated the genetic basis of both resistance and virulence, informing marker-assisted breeding and novel control strategies. Environmental factors such as temperature, humidity and soil microbiome composition further modulate disease outcomes, underscoring the need for integrated management approaches. This dynamic arms race has global implications for crop yield, food security and pathogen emergence, driving multidisciplinary research into durable resistance, early detection tools and biocontrol solutions.

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Plant Pathogen Interactions in Brassica Species and Brassicaceae publication trend

The graph below shows the total number of articles in plant pathogen interactions in brassica species and brassicaceae across all publications each year (not limited to Nature Index journals).

Technical terms

Pattern‐triggered immunity (PTI): The basal defence response activated when cell‐surface receptors recognise conserved microbial molecules (PAMPs).

Effector‐triggered immunity (ETI): A robust defence layer initiated when intracellular resistance proteins detect specific pathogen effector molecules.

Phytohormone signalling: The coordinated action of plant hormones (e.g. salicylic acid, jasmonic acid, ethylene) in modulating immune and developmental responses.

Differentially expressed genes (DEGs): Genes that show statistically significant changes in expression levels between contrasting experimental conditions, such as healthy versus infected tissues.

References

1. Comparative Transcriptome Analysis between Resistant and Susceptible Pakchoi Cultivars in Response to Downy Mildew. International Journal of Molecular Sciences (2023).
2. Brassicaceae Fungi and Chromista Diseases: Molecular Detection and Host–Plant Interaction. Plants (2023).
3. A Whole-Genome Assembly for Hyaloperonospora parasitica, A Pathogen Causing Downy Mildew in Cabbage (Brassica oleracea var. capitata L.). Journal of Fungi (2023).