Novel Insight into Elicitors of Plant Immunity and the Activated Defensive Pathways

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Protection and Biotic Interactions".

Deadline for manuscript submissions: 31 October 2025 | Viewed by 573

Special Issue Editors


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Guest Editor
College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
Interests: rice immunity; development of plant resistance inducer
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Guest Editor
1. Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, Fuzhou Institute of Oceanography, Minjiang University, Fuzhou 350108, China
2. Fujian Universities Key Laboratory for Plant Microbe Interaction, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Interests: plant-fungal interactions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Current plant protection from pathogenic microorganisms still mainly depends on the application of chemical fungicides and bactericides. The undesirable consequences of excessive or indiscriminate application of these compounds, such as environmental pollution, chemical residues and biodiversity reduction, have drawn worldwide concern. Plant immunity elicitors (PIEs), the components derived from biological sources or natural/synthetic compounds, can induce plant defensive responses through exogenous treatment. Usually, PIEs are unable to inhibit pathogens’ growth and thus have low toxicity. Over recent decades, accumulating PIEs are identified, which, according to the chemical properties, can be classified into proteins, oligosaccharides, lipids, metabolites and chemical compounds. Discovering and characterizing PIEs, especially those with an ability to induce durable and broad-spectrum plant resistance, provides a feasible strategy for controlling plant diseases in an environmentally friendly manner. Therefore, the aim of this Special Issue of Plants is to pool and publish new insights into PIEs and their functional mechanisms, which is expected to advance the knowledge of plant immunity priming and develop prospective plant disease-controlling agents with biological safety.

Prof. Dr. Mo Wang
Prof. Dr. Zonghua Wang
Guest Editors

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Keywords

  • plant innate immunity
  • elicitor
  • induction mechanism
  • resistance against pathogenic microorganisms

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Published Papers (1 paper)

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Review

15 pages, 2330 KiB  
Review
Fungal Melanin in Plant Pathogens: Complex Biosynthesis Pathways and Diverse Biological Functions
by Hui Jia, Ning Liu, Lu Zhang, Pan Li, Yanan Meng, Wei Yuan, Haixiao Li, Dezeng Tantai, Qing Qu, Zhiyan Cao and Jingao Dong
Plants 2025, 14(14), 2121; https://doi.org/10.3390/plants14142121 - 9 Jul 2025
Viewed by 301
Abstract
Fungal melanin plays a vital role in the survival, reproduction, infection, and environmental adaptation of plant pathogenic fungi. To develop innovative strategies for managing plant fungal diseases, comprehensive investigations into melanin are imperative. Such research is fundamental to elucidating the mechanistic basis of [...] Read more.
Fungal melanin plays a vital role in the survival, reproduction, infection, and environmental adaptation of plant pathogenic fungi. To develop innovative strategies for managing plant fungal diseases, comprehensive investigations into melanin are imperative. Such research is fundamental to elucidating the mechanistic basis of fungal pathogenesis and holds promise for the design of targeted interventions against melanin-mediated virulence determinants. This review systematically elaborates on the classification of fungal melanin in plant pathogens, provides a detailed analysis of the biosynthetic processes of 3,4-dihydroxyphenylalanine (DOPA) and 1,8-dihydroxynaphthalene melanin (DHN melanins), and reveals the catalytic functions and regulatory mechanisms of key enzymes within these pathways. Melanin modulates fungal virulence by influencing appressorial integrity and turgor pressure formation, thereby participating in the host infection process and the formation of overwintering sclerotia. Melanin provides stress resistance by protecting against extreme environmental factors, including UV radiation and high temperatures. It also has the capacity to absorb heavy metals, which increases pathogen survival under adverse conditions. Furthermore, the review also explores the mechanisms of action of melanin inhibitors that target plant pathogenic fungi, providing a theoretical foundation for developing efficient and environmentally friendly antifungal medications. The complex biosynthesis pathways and diverse biological functions of fungal melanin highlight its significant theoretical and practical importance for elucidating pathogenic mechanisms and formulating scientific control strategies. Full article
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