Journal Article

Anatomical-based defense responses of Scots pine (<i>Pinus sylvestris</i>) stems to two fungal pathogens

Nina Elisabeth Nagy, Paal Krokene and Halvor Solheim

in Tree Physiology

Volume 26, issue 2, pages 159-167
Published in print February 2006 | ISSN: 0829-318X
Published online February 2006 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/26.2.159
Anatomical-based defense responses of Scots pine (Pinus sylvestris) stems to two fungal pathogens

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We investigated the cellular responses of stem tissues of mature Scots pine (Pinus sylvestris L.) trees to inoculations with two fungal pathogens. The bark beetle vectored fungus, Leptographium wingfieldii Morelet, induced longer lesions in the bark, stronger swelling of polyphenolic parenchyma cells, more polyphenol accumulation and increased ray parenchyma activity compared with the root rot fungus, Heterobasidion annosum (Fr.) Bref., or mechanical wounding. Axial resin ducts in the xylem are a general feature of the preformed defenses of Scots pine, but there was no clear induction of additional traumatic axial resin ducts in response to wounding or fungal infection. The anatomical responses of Scots pine to pathogen infection were localized to the infection site and were attenuated away from bark lesions. The responses observed in Scots pine were compared with published studies on Norway spruce (Picea abies (L.) Karst.) for which anatomically based defense responses have been well characterized.

Keywords: calcium oxalate crystals; Heterobasidion annosum; Leptographium wingfieldii; polyphenolic parenchyma cells; ray parenchyma cells; resin ducts; starch

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Subjects: Plant Sciences and Forestry

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