Modification of Primary and Secondary Metabolism of Potato Plants by Nitrogen Application Differentially Affects Resistance to Phytophthora infestans and Alternaria solani

Authors

  • K. Mittelstraß,

    1. Institute of Phytopathology, Centre of Life and Food Sciences Weihenstephan, Technische Universität München, Am Hochanger 2, 85350 Freising, Germany
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  • D. Treutter,

    1. Institute of Fruit Science, Centre of Life and Food Sciences Weihenstephan, Technische Universität München, Alte Akademie 16, 85350 Freising, Germany
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  • M. Pleßl,

    1. Institute of Phytopathology, Centre of Life and Food Sciences Weihenstephan, Technische Universität München, Am Hochanger 2, 85350 Freising, Germany
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  • W. Heller,

    1. GSF - National Research Center for Environment and Health, Institute of Biochemical Plant Pathology, Ingolstädter LandStraße 1, 85764 Neuherberg, Germany
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  • E. F. Elstner,

    1. Institute of Phytopathology, Centre of Life and Food Sciences Weihenstephan, Technische Universität München, Am Hochanger 2, 85350 Freising, Germany
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  • I. Heiser

    Corresponding author
    1. Institute of Phytopathology, Centre of Life and Food Sciences Weihenstephan, Technische Universität München, Am Hochanger 2, 85350 Freising, Germany
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Lehrstuhl für Phytopathologie Wissenschaftszentrum Weihenstephan Technische Universität München Am Hochanger 85350 Freising Germany E-mail: heiser@lrz.tum.de

Abstract

Abstract: Potato plants (Solanum tuberosum L. cv. Indira) were grown at two levels of N supply in the greenhouse. Plants supplied with 0.8 g N per plant (high N variant) showed significantly increased biomass as compared to plants without additional N fertilisation (low N variant). C/N ratio was lower and protein content was higher in leaves of the high N variant. The concentration of chlorogenic acids and flavonols was significantly lower in leaves from the high N variant. Whereas resistance to Alternaria solani increased when plants were supplied with additional nitrogen, these plants were more susceptible to Phytophthora infestans. After infection with both pathogens, we found a strong induction of p-coumaroylnoradrenaline and p-coumaroyloctopamine, which are identified for the first time in potato leaves and are discussed as resistance factors of other solanaceous plants.

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