Systemic Potato virus X infection induces defence gene expression and accumulation of β-phenylethylamine-alkaloids in potato

Functional Plant Biology : FPB
Annette NiehlJoachim Fisahn

Abstract

A better understanding of defence responses elicited during compatible plant-virus interactions is a current goal in plant pathology. We analysed defence responses during infection of Solanum tuberosum L. cv. Desiree with Potato virus X (PVX) at the transcript and metabolite level. A mostly unchanged primary metabolism reflects the compatible nature of this plant-virus interaction. Salicylic acid biosynthesis and expression of several defence genes including PR-1 and glutathione-S-transferase, which are involved in ethylene and reactive oxygen species dependent signalling, were highly up-regulated in upper-uninoculated (systemic) leaves of PVX-infected potato plants compared with mock-inoculated controls. Moreover, the β-phenylethylamine-alkaloids tyramine, octopamine, dopamine and norepinephrine were highly induced upon infection. β-phenylethylamine-alkaloids can contribute to active plant defence responses by forming hydroxycinnamic acid amides (HCAA), which are thought to increase cell wall stability by extracellular peroxidative polymerisation. Expression of tyramine-hydroxycinnamoyl transferase (THT) and apoplastic peroxidase (POD) was highly induced upon PVX infection in systemic leaves, which suggests synthesis and extra...Continue Reading

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Citations

Feb 13, 2010·Journal of Experimental Botany·Berit EbertJoachim Fisahn
Jan 10, 2019·Frontiers in Plant Science·Gábor GullnerPeter Schröder

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Methods Mentioned

BETA
dissection
PCR
enzyme-linked immunosorbent assay
ELISA

Software Mentioned

LinRegPCR
Primer3
SDS
ChromaTOF

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