Transcriptional Regulation in Plant Defense Mechanisms

Plants rely on precise control of gene expression to mount effective defences against a wide array of pathogens. Transcriptional regulation lies at the heart of this process, integrating external cues such as pathogen-associated molecular patterns with internal phytohormone signals to orchestrate downstream resistance responses. Key families of transcription factors, notably WRKY, bHLH, MYB and AP2/ERF, bind to specific promoter elements (for example W-box motifs) to activate or repress target genes encoding pathogenesis-related proteins, enzymes for antimicrobial metabolite synthesis and components of cell-wall reinforcement. Salicylic acid, jasmonic acid and ethylene pathways engage in a finely balanced crosstalk, with individual transcription factors acting as nodes that either promote systemic acquired resistance or localised hypersensitive responses. Emerging evidence also highlights the role of chromatin remodelling and histone modifications in setting transcriptional memory that primes plants for faster responses upon subsequent attacks. Advanced genomic and epigenomic tools, including RNA sequencing, chromatin immunoprecipitation and genome editing, have revealed both conserved and species-specific regulatory modules. Understanding these networks not only sheds light on fundamental plant immunity but also offers routes to engineer durable disease resistance in crops, reducing reliance on chemical controls and improving global food security.

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Transcriptional Regulation in Plant Defense Mechanisms publication trend

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Technical terms

Transcription factor: A protein that binds specific DNA sequences in gene promoters to regulate transcription.

W-box: A cis-regulatory element (core sequence TTGACC/T) recognised by WRKY transcription factors.

Pathogenesis-related (PR) proteins: A group of antimicrobial proteins induced during defence responses.

Systemic acquired resistance (SAR): A long-lasting, broad-spectrum immune state triggered by local pathogen attack and mediated by salicylic acid.

Chromatin immunoprecipitation: A technique used to detect binding of transcription factors or histone modifications at specific genomic regions.

References

1. SlWRKY30 and SlWRKY81 synergistically modulate tomato immunity to Ralstonia solanacearum by directly regulating SlPR-STH2. Horticulture Research (2023).
2. Involvement of CsWRKY70 in salicylic acid-induced citrus fruit resistance against Penicillium digitatum. Horticulture Research (2020).
3. The WRKY transcription factor PlWRKY65 enhances the resistance of Paeonia lactiflora (herbaceous peony) to Alternaria tenuissima. Horticulture Research (2020).