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  1. IPB Halle
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    • Trenner 0
    • Molecular Signal Processing
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      • Secretariat & All Staff
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Publications

Kopischke, M.; Westphal, L.; Schneeberger, K.; Clark, R.; Ossowski, S.; Wewer, V.; Fuchs, R.; Landtag, J.; Hause, G.; Dörmann, P.; Lipka, V.; Weigel, D.; Schulze-Lefert, P.; Scheel, D.; Rosahl, S.; Impaired sterol ester synthesis alters the response of Arabidopsis thaliana to Phytophthora infestans Plant J. 73 456-468 (2013) DOI: 10.1111/tpj.12046
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Non‐host resistance of Arabidopsis thaliana against Phytophthora infestans, the causal agent of late blight disease of potato, depends on efficient extracellular pre‐ and post‐invasive resistance responses. Pre‐invasive resistance against P. infestans requires the myrosinase PEN2. To identify additional genes involved in non‐host resistance to P. infestans, a genetic screen was performed by re‐mutagenesis of pen2 plants. Fourteen independent mutants were isolated that displayed an enhanced response to Phytophthora (erp) phenotype. Upon inoculation with P. infestans, two mutants, pen2‐1 erp1‐3 and pen2‐1 erp1‐4, showed an enhanced rate of mesophyll cell death and produced excessive callose deposits in the mesophyll cell layer. ERP1 encodes a phospholipid:sterol acyltransferase (PSAT1) that catalyzes the formation of sterol esters. Consistent with this, the tested T‐DNA insertion lines of PSAT1 are phenocopies of erp1 plants. Sterol ester levels are highly reduced in all erp1/psat1 mutants, whereas sterol glycoside levels are increased twofold. Excessive callose deposition occurred independently of PMR4/GSL5 activity, a known pathogen‐inducible callose synthase. A similar formation of aberrant callose deposits was triggered by the inoculation of erp1psat1 plants with powdery mildew. These results suggest a role for sterol conjugates in cell non‐autonomous defense responses against invasive filamentous pathogens.

Publications

Molendijk, A. J.; Ruperti, B.; Singh, M. K.; Dovzhenko, A.; Ditengou, F. A.; Milia, M.; Westphal, L.; Rosahl, S.; Soellick, T.-R.; Uhrig, J.; Weingarten, L.; Huber, M.; Palme, K.; A cysteine-rich receptor-like kinase NCRK and a pathogen-induced protein kinase RBK1 are Rop GTPase interactors Plant J. 53 909-923 (2008) DOI: 10.1111/j.1365-313X.2007.03384.x
  • Abstract
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In plants, Rop/Rac GTPases have emerged as central regulators of diverse signalling pathways in plant growth and pathogen defence. When active, they interact with a wide range of downstream effectors. Using yeast two‐hybrid screening we have found three previously uncharacterized receptor‐like protein kinases to be Rop GTPase‐interacting molecules: a cysteine‐rich receptor kinase, named NCRK, and two receptor‐like cytosolic kinases from the Arabidopsis RLCK‐VIb family, named RBK1 and RBK2. Uniquely for Rho‐family small GTPases, plant Rop GTPases were found to interact directly with the protein kinase domains. Rop4 bound NCRK preferentially in the GTP‐bound conformation as determined by flow cytometric fluorescence resonance energy transfer measurements in insect cells. The kinase RBK1 did not phosphorylate Rop4 in vitro , suggesting that the protein kinases are targets for Rop signalling. Bimolecular fluorescence complementation assays demonstrated that Rop4 interacted in vivo with NCRK and RBK1 at the plant plasma membrane. In Arabidopsis protoplasts, NCRK was hyperphosphorylated and partially co‐localized with the small GTPase RabF2a in endosomes. Gene expression analysis indicated that the single‐copy NCRK gene was relatively upregulated in vasculature, especially in developing tracheary elements. The seven Arabidopsis RLCK‐VIb genes are ubiquitously expressed in plant development, and highly so in pollen, as in case of RBK2 . We show that the developmental context of RBK1 gene expression is predominantly associated with vasculature and is also locally upregulated in leaves exposed to Phytophthora infestans and Botrytis cinerea pathogens. Our data indicate the existence of cross‐talk between Rop GTPases and specific receptor‐like kinases through direct molecular interaction.

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