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Unravelling the Function of a Bacterial Effector from a Non-cultivable Plant Pathogen Using a Yeast Two-hybrid Screen
Published on: January 20, 2017
Xanthomonas effectors: nutritional hijacking for a long running battle.
Xian Chen1, Pedro Laborda2, Oluwatoyin Oluwakemi Afolabi3
1Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, PR China.
Pest Management Science
|June 17, 2026
Summary
Xanthomonas bacteria hijack plant nutrients for virulence. Targeting this nutrient theft offers a new strategy for sustainable crop protection against devastating plant diseases.
Area of Science:
- Plant Pathology
- Microbial Pathogenesis
- Molecular Plant-Microbe Interactions
Background:
- Xanthomonas spp. cause significant agricultural losses globally.
- Type III secretion system (T3SS) effectors are crucial for Xanthomonas virulence, but many functions are unknown.
- Understanding effector mechanisms is key to developing crop protection strategies.
Purpose of the Study:
- To elucidate the mechanisms by which Xanthomonas effectors manipulate host metabolism and physiology.
- To identify conserved virulence strategies across different Xanthomonas pathogens.
- To explore novel targets for sustainable crop protection.
Main Methods:
- Investigated the AvrBs2 effector from Xanthomonas oryzae pv. oryzicola and its role in xanthosan synthesis.
- Analyzed the PthA4 effector from Xanthomonas citri pv. citri and its activation of the CsLOB1 gene.
- Examined the utilization of host-derived sugars by bacteria.
- Assessed resistance in transgenic rice engineered to degrade xanthosan.
Main Results:
- AvrBs2 effector manipulates host metabolism to create xanthosan, a unique bacterial nutrient.
- PthA4 effector activates host gene CsLOB1, leading to cell wall degradation and release of sugars like xylose.
- Released sugars activate bacterial nutrient uptake, creating a feed-forward loop promoting infection.
- Transgenic rice degrading xanthosan showed resistance to Xanthomonas.
Conclusions:
- Nutrient hijacking is a conserved virulence mechanism in Xanthomonas.
- Virulence arises from the interplay between host manipulation and bacterial physiology.
- Targeting nutrient hijacking pathways offers promising avenues for sustainable crop protection.
Keywords:
Xanthomonascrop resistance, AvrBs2, PthA4metabolite hijackingnutritional immunityplant‐pathogen interactionstype III effectorsMore Related Videos
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