Timing of Phenolic Responses to Pathogen Infection in Austrian Pine (Pinus nigra)
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Date
2006-04-17T13:48:19Z
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Abstract
Austrian pine (Pinus nigra) unleashes a suite of induced phenolic compounds to combat pathogen attack. This study focuses on the timing of this response to infection, both locally and systemically, by analyzing the phenolic profile 0, 1, 16, 64, and 144 hours following initial infection. This study used two pathogens, an aggressive pathogen, Sphaeropsis sapinea, and a similar but weaker pathogen Diplodia scrobiculata. Both fungi were used to inoculate Austrian pine according to protocols established for the Austrian pine/S. sapinea pathosystem. For both pathogens, it was found that around the inoculation site phenolic compounds such as taxifolin, pinosylvin, and pinosylvin monomethyl ether increased steadily beginning at 64 hours post infection, whereas ferulic acid glucoside, a lignin precursor, decreased steadily over that time period. The accumulation of pinosylvin and pinosylvin monomethyl ether was quicker in response to infection by D. scrobiculata, indicating that Austrian pine might be better at recognizing the weaker pathogen. No changes in systemic chemical composition were seen even at the 144 hour time point in this study, perhaps indicating that a greater time period is needed for the host to mount a systemic induced resistance response.
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Pine, induced resistance