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Paradoxical Immune Phenotypes and Dual-State Immune Regulators in Plants: The GSL5 Case Study
Lixia Gao1, Rong Zuo1, Xiong Zhang1
1Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China.
International Journal of Molecular Sciences
|June 26, 2026
Summary
Plant immune genes can paradoxically enhance resistance when disrupted. This study introduces "dual-state immune regulators," like GSL5, which promote defense through distinct mechanisms when functional versus when absent.
Area of Science:
- Plant immunity
- Molecular genetics
- Plant-pathogen interactions
Background:
- Traditional plant immune gene classification is insufficient for genes with paradoxical disease phenotypes.
- Genes involved in defense processes can paradoxically confer resistance upon genetic disruption.
- GSL5/PMR4, a callose synthase, exemplifies this phenomenon, contributing to structural defense but conferring resistance when lost.
Purpose of the Study:
- Introduce and define "dual-state immune regulators" to explain paradoxical immune phenotypes.
- Discuss the biological features and potential mechanisms of these regulators.
- Explore implications for enhancing plant resistance breeding strategies.
Main Methods:
- Review of existing literature on plant immune genes and paradoxical phenotypes.
- Focus on GSL5/PMR4 as a central case study.
- Analysis of related immune pathways including salicylic acid, N-hydroxypipecolic acid, and jasmonic acid signaling.
Main Results:
- GSL5 loss confers resistance to powdery mildew via salicylic acid and N-hydroxypipecolic acid pathways.
- GSL5 loss also confers broad-spectrum resistance to Plasmodiophora brassicae through jasmonic acid-dependent immunity.
- Dual-state regulation is observed in other plant immune processes like MAPK signaling and calcium influx.
Conclusions:
- Dual-state immune regulators represent a critical, yet underappreciated, layer of plant defense.
- Understanding these regulators, exemplified by GSL5, offers novel strategies for breeding disease-resistant crops.
- Targeting these genes could lead to durable, broad-spectrum resistance against various plant pathogens.
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