Modification of primary and secondary metabolism of potato plants by nitrogen application differentially affects resistance to Phytophthora infestans and Alternaria solani.

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.

• Authors: K Mittelstrass, D Treutter, M Plessl, W Heller, E F Elstner, I Heiser
• Journal: Plant biology (Stuttgart, Germany) (Plant Biol (Stuttg)) Vol. 8 Issue 5 Pg. 653-61 (Sep 2006) ISSN: 1435-8603 [Print] England
• PMID: 16821190 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• 4-coumaroylnoradrenaline
• Coumaric Acids
• Fertilizers
• N-4-coumaroyloctopamine
• Phenols
• Octopamine
• Nitrogen
• Norepinephrine

Topics

• Alternaria (physiology)
• Coumaric Acids (chemistry, metabolism)
• Fertilizers
• Molecular Structure
• Nitrogen (pharmacology)
• Norepinephrine (analogs & derivatives, chemistry, metabolism)
• Octopamine (analogs & derivatives, chemistry, metabolism)
• Phenols (metabolism)
• Phytophthora (physiology)
• Plant Diseases (microbiology)
• Solanum tuberosum (drug effects, metabolism, microbiology)
• Time Factors