Terpene response of Picea abies and Abies alba to infection with Heterobasidion s.l.

Abstract

The monoterpene composition of Picea abies and Abies alba resin was analysed in relation to growth by Heterobasidion spp. Fifteen-year-old P. abies and A. alba trees were inoculated on branches with three species of Heterobasidion annosum s.l. After 4 months of incubation, each host was colonized to a significantly greater degree by the pathogen specific to that host (H. parviporum on P. abies, H. abietinum on A. alba) than by the other fungi. Analysis of the enantiomeric monoterpene profiles in the spruce and fir showed that the response in terms of the relative proportions of the monoterpene compounds in the resin differed between tree species. Following challenge with Heterobasidion spp., A. alba trees did not show changes in monoterpene composition in addition to those in the wounding response (increase in ())-a-pinene and ())-camphene, and decrease in b-phellandrene). In P.abies, ())-a-pinene, (+)-a-pinene and d-3-carene increased following Heterobasidion attack but not after wounding alone.

Monoterpene responses to interacting effects of drought stress and infection by the fungus Heterobasidion parviporum in two clones of Norway spruce (Picea abies)

“…These data were not in agreement with previous results from Zamponi et al (2007), who found that proportions of (−)-limonene decreased significantly in 15-year-old Norway spruce trees grown in a field trial and infected by H. parviporum. Although this contrasting response could be due to differences in experimental design between studies, i.e., greenhouse pot vs field experiments, sampling time, and different ages of the plants, another possible explanation is that plant chemical defences can vary with plant ontogeny.…”

“…In Norway spruce trees, the relative proportion of δ-3-carene was found to increase in response to inoculation with H. parviporum (Zamponi et al, 2007).…”

Peripheral modulation of pheromone response by inhibitory host compound in a beetle

“…Indeed, several monoterpenes are toxic and lethal to bark beetles (Everaerts et al, 1988;Raffa and Smalley, 1995) and to their symbiotic fungi (Raffa et al, 1985). Although not vectored by bark beetles, inoculation of Norway spruce with pathogenic fungus Heterobasidion parviporum resulted in an increased content of 1,8-cineole (Zamponi et al, 2007). In addition, p-cymene was the most effective of all tested terpenes in reducing growth of coniferous decay fungi (De Groot, 1972).…”

Strong Induction of Minor Terpenes in Italian Cypress, Cupressus sempervirens, in Response to Infection by the Fungus Seiridium cardinale

“…Conifers can have distinct terpene reactions to different fungal pathogens Schiller and Madar 1991;Zamponi et al 2007), but usually exhibit similar reactions to different fungal isolates or strains of the same fungus (Bonello et al 2008;Faldt et al 2006;Schiller and Madar 1991). In addition to the local terpene reactions to fungal infection, systemic responses have been found in non-infected tissues.…”