Interplay of EXO70 and MLO proteins modulates trichome cell wall composition and susceptibility to powdery mildew
Huebbers JW, Caldarescu GA, Kubátová Z, Sabol P, Levecque SCJ, Kuhn H, Kulich I, Reinstädler A, Büttgen K, Manga-Robles A, Mélida H, Pauly M, Panstruga R, Žárský V. 2024. Interplay of EXO70 and MLO proteins modulates trichome cell wall composition and susceptibility to powdery mildew. Plant Cell. 36(4), 1007–1035.
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Huebbers, Jan W.;
Caldarescu, George A.;
Kubátová, Zdeňka;
Sabol, Peter;
Levecque, Sophie C.J.;
Kuhn, Hannah;
Kulich, IvanISTA;
Reinstädler, Anja;
Büttgen, Kim;
Manga-Robles, Alba;
Mélida, Hugo;
Pauly, Markus
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All
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Abstract
Exocyst component of 70-kDa (EXO70) proteins are constituents of the exocyst complex implicated in vesicle tethering during exocytosis. MILDEW RESISTANCE LOCUS O (MLO) proteins are plant-specific calcium channels and some MLO isoforms enable fungal powdery mildew pathogenesis. We here detected an unexpected phenotypic overlap of Arabidopsis thaliana exo70H4 and mlo2 mlo6 mlo12 triple mutant plants regarding the biogenesis of leaf trichome secondary cell walls. Biochemical and Fourier transform infrared spectroscopic analyses corroborated deficiencies in the composition of trichome cell walls in these mutants. Transgenic lines expressing fluorophore-tagged EXO70H4 and MLO exhibited extensive colocalization of these proteins. Furthermore, mCherry-EXO70H4 mislocalized in trichomes of the mlo triple mutant and, vice versa, MLO6-GFP mislocalized in trichomes of the exo70H4 mutant. Expression of GFP-marked PMR4 callose synthase, a known cargo of EXO70H4-dependent exocytosis, revealed reduced cell wall delivery of GFP-PMR4 in trichomes of mlo triple mutant plants. In vivo protein–protein interaction assays in plant and yeast cells uncovered isoform-preferential interactions between EXO70.2 subfamily members and MLO proteins. Finally, exo70H4 and mlo6 mutants, when combined, showed synergistically enhanced resistance to powdery mildew attack. Taken together, our data point to an isoform-specific interplay of EXO70 and MLO proteins in the modulation of trichome cell wall biogenesis and powdery mildew susceptibility.
Publishing Year
Date Published
2024-04-01
Journal Title
Plant Cell
Volume
36
Issue
4
Page
1007-1035
ISSN
eISSN
IST-REx-ID
Cite this
Huebbers JW, Caldarescu GA, Kubátová Z, et al. Interplay of EXO70 and MLO proteins modulates trichome cell wall composition and susceptibility to powdery mildew. Plant Cell. 2024;36(4):1007-1035. doi:10.1093/plcell/koad319
Huebbers, J. W., Caldarescu, G. A., Kubátová, Z., Sabol, P., Levecque, S. C. J., Kuhn, H., … Žárský, V. (2024). Interplay of EXO70 and MLO proteins modulates trichome cell wall composition and susceptibility to powdery mildew. Plant Cell. Oxford University Press. https://doi.org/10.1093/plcell/koad319
Huebbers, Jan W., George A. Caldarescu, Zdeňka Kubátová, Peter Sabol, Sophie C.J. Levecque, Hannah Kuhn, Ivan Kulich, et al. “Interplay of EXO70 and MLO Proteins Modulates Trichome Cell Wall Composition and Susceptibility to Powdery Mildew.” Plant Cell. Oxford University Press, 2024. https://doi.org/10.1093/plcell/koad319.
J. W. Huebbers et al., “Interplay of EXO70 and MLO proteins modulates trichome cell wall composition and susceptibility to powdery mildew,” Plant Cell, vol. 36, no. 4. Oxford University Press, pp. 1007–1035, 2024.
Huebbers JW, Caldarescu GA, Kubátová Z, Sabol P, Levecque SCJ, Kuhn H, Kulich I, Reinstädler A, Büttgen K, Manga-Robles A, Mélida H, Pauly M, Panstruga R, Žárský V. 2024. Interplay of EXO70 and MLO proteins modulates trichome cell wall composition and susceptibility to powdery mildew. Plant Cell. 36(4), 1007–1035.
Huebbers, Jan W., et al. “Interplay of EXO70 and MLO Proteins Modulates Trichome Cell Wall Composition and Susceptibility to Powdery Mildew.” Plant Cell, vol. 36, no. 4, Oxford University Press, 2024, pp. 1007–35, doi:10.1093/plcell/koad319.
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