Abstract
Clubroot disease caused by Plasmodiophora brassicae Woronin (P. brassicae) has seriously influenced the production of Brassica rapa crops, but the interaction mechanism between P. brassicae and Brassica rapa is not clear. In our previous study, a differentially expressed protein, G15, was found between the roots of Chinese cabbage inoculated and un-inoculated with P. brassicae through two-dimensional electrophoresis (2-DE) and mass spectrometry, and G15 was matched with Bra011464. In this study, Bra011464 was found to have a 94% percent identity with Arabidopsis thaliana CAP, named BrCAP. The expression of BrCAP was the highest in the root compared with the stems and leaves of Chinese cabbage, and its expression in the roots of Chinese cabbage inoculated with P. brassicae was significantly higher than that in the control. The results were verified by real-time quantitative polymerase chain reaction (RT-qPCR) and in situ hybridization. Subcellular localization showed that BrCAP was localized on chloroplasts of leaf epidermal cells. To verify the function of BrCAP, it was found that the Arabidopsis thaliana mutant cap was more susceptible to infection with P. brassicae than the wild type (WT), which suggested that BrCAP has a potential role in the resistance progress of Chinese cabbage to P. brassicae.
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