Modification of primary and secondary metabolism of potato plants by nitrogen application differentially affects resistance to Phytophthora infestans and Alternaria solani.
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.
Mittelstrass
K
K
Institute of Phytopathology, Centre of Life and Food Sciences Weihenstephan, Technische Universität München, Am Hochanger 2, 85350 Freising, Germany.
Treutter
D
D
Plessl
M
M
Heller
W
W
Elstner
E F
EF
Heiser
I
I
D000528:Alternaria / Q000502:physiology*; D003373:Coumaric Acids / Q000737:chemistry / Q000378:metabolism; D005308:Fertilizers; D015394:Molecular Structure; D009584:Nitrogen / Q000494:pharmacology*; D009638:Norepinephrine / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism; D009655:Octopamine / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism; D010636:Phenols / Q000378:metabolism; D010838:Phytophthora / Q000502:physiology*; D010935:Plant Diseases / Q000382:microbiology; D011198:Solanum tuberosum / Q000187:drug effects / Q000378:metabolism* / Q000382:microbiology*; D013997:Time Factors
C479745:4-coumaroylnoradrenaline; D003373:Coumaric Acids; D005308:Fertilizers; C410948:N-4-coumaroyloctopamine; D010636:Phenols; D009655:Octopamine; D009584:Nitrogen; D009638:Norepinephrine