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A Ca2+ sensor BraCBL1.2 involves in BraCRa-mediated clubroot resistance in Chinese cabbage
Yinglan Piao1, Shizhen Li2, Yiduo Chen3
1State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Researchers identified BraCBL1.2, a calcium sensor gene, crucial for Chinese cabbage resistance against clubroot disease (caused by Plasmodiophora brassicae). This discovery aids in developing strategies to combat this significant agricultural threat.
Area of Science:
- Plant Pathology
- Molecular Plant-Microbe Interactions
- Plant Molecular Biology
Background:
- Clubroot disease, caused by Plasmodiophora brassicae, poses a severe threat to cruciferous crops, particularly Chinese cabbage.
- Plant resistance often involves calcium-permeable channels mediating cytosolic calcium increases upon pathogen attack, but downstream calcium sensors remain unidentified.
- The specific molecular mechanisms underlying BraCRa-mediated resistance in Chinese cabbage against P. brassicae are not fully understood.
Purpose of the Study:
- To identify downstream calcium (Ca2+) sensors involved in the BraCRa-mediated clubroot resistance pathway in Chinese cabbage.
- To elucidate the role of identified Ca2+ sensor genes in plant immune responses against Plasmodiophora brassicae.
- To provide a theoretical basis for enhancing clubroot resistance in Chinese cabbage.
Main Methods:
- Transcriptomic analysis of near-isogenic Chinese cabbage lines (CR 3-2 and CS 3-2) inoculated with virulent (PbE) and avirulent (Pb4) Plasmodiophora brassicae isolates.
- Identification and characterization of differentially expressed genes, including Ca2+ sensor genes.
- GUS histochemical staining, subcellular localization, hypersensitive response (HR) assays in tobacco, and gene overexpression in Arabidopsis to validate function.
Main Results:
- The Ca2+ sensor gene, BraCBL1.2, was identified and found to be highly induced in resistant Chinese cabbage (CR 3-2) upon infection with avirulent Pb4, but not virulent PbE.
- BraCBL1.2 exhibits specific expression in root hair cells and encodes a plasma membrane-localized Ca2+ sensor.
- Overexpression of BraCBL1.2 enhanced clubroot resistance in Arabidopsis, and BraCBL1.2 was implicated in the BraCRa-mediated plant Effector-Triggered Immunity (ETI) response.
Conclusions:
- BraCBL1.2 is a key Ca2+ sensor involved in the BraCRa-mediated plant immune response against Plasmodiophora brassicae in Chinese cabbage.
- The findings reveal a novel component of the plant immune system, linking calcium signaling to ETI against clubroot disease.
- This study provides crucial insights and a theoretical foundation for developing novel strategies to improve clubroot resistance in Chinese cabbage.
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