NDLI: Influence of Fungal Infection and Wounding on Contents and Enantiomeric Compositions of Monoterpenes in Phloem of Pinus sylvestris

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Influence of Fungal Infection and Wounding on Contents and Enantiomeric Compositions of Monoterpenes in Phloem of Pinus sylvestris

Content Provider	Springer Nature Link
Author	Fäldt, Jenny Solheim, Halvor Långström, Bo Borg Karlson, Anna Karin
Copyright Year	2006
Abstract	To identify chemical resistant markers induced by fungal or mechanical injury, young trees of Scots pine (Pinus sylvestris) were subjected to inoculations of blue stain fungi associated with the pine shoot beetles Tomicus piniperda and T. minor. Among the 20 trees selected for chemical analyses, 16 were divided into four groups: one as control and three were pretreated by wounding only, or by inoculation with either the blue stain fungus Leptographium wingfieldii or Ophiostoma canum. Four wk after pretreatment, all 16 pretreated trees were mass-inoculated with L. wingfieldii. The absolute and relative amounts, as well as the enantiomeric compositions of monoterpene hydrocarbons in the phloem, were determined via a small sample of the phloem before and after the pretreatment and mass inoculation, by using two-dimensional gas chromatography (2D GC) and GC-mass spectrometry (MS). After mass inoculation, the absolute amounts of most of the monoterpenes decreased in the phloem sampled >20 cm from the fungal infection, and were higher in the phloem sampled within the infected reaction zone. The relative amounts of both (−)-β-pinene and (−)-limonene increased in phloem samples taken >20 cm above the fungal inoculation in the preinoculated trees compared with phloem sampled from the remaining four control trees. The enantiomeric compositions of β-pinene and limonene changed, after fungal growth, at defined distances from the inoculation site: the proportion of the (−)-enantiomers was highest in the phloem sampled >20 cm from the fungal inoculation. Four wk after pretreatment, monoterpene production in the phloem at the site of inoculation was more enhanced by L. wingfieldii than by O. canum. However, the different virulence levels of the fungi did not affect the enantiomeric composition of the monoterpenes. The biosynthesis of monoterpene enantiomers is discussed in relation to induced pathogen resistance.
Starting Page	1779
Ending Page	1795
Page Count	17
File Format	PDF
ISSN	00980331
Journal	Journal of Chemical Ecology
Volume Number	32
Issue Number	8
e-ISSN	15731561
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-08-02
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pinus Tomicus piniperda Leptographium Ophiostoma Terpene Enantiomer Inoculation Resistance (-)-p-pinene (-)-limonene Biological Microscopy Ecology Agriculture Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Ecology, Evolution, Behavior and Systematics

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