Organ-dependent induction of systemic resistance and systemic susceptibility in Pinus nigra inoculated with Sphaeropsis sapinea and Diplodia scrobiculata

Systemic induced resistance (SIR) is a well-known host defense mechanism against pathogen attack in herbaceous plants, but SIR has only recently been documented in conifers. We tested if inoculation of Austrian pine (Pinus nigra Arnold) with Sphaeropsis sapinea (Fr.:Fr.) Dyko and Sutton or Diplodia...

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Bibliographic Details
Published in:Tree physiology 2007-04, Vol.27 (4), p.511-517
Main Authors: Blodgett, J.T, Eyles, A, Bonello, P
Format: Article
Language:English
Subjects:
Ascomycota - pathogenicity
biosynthesis
Diplodia
Diplodia scrobiculata
disease resistance
forest trees
fungal diseases of plants
lignin
Lignin - metabolism
Organ Specificity
pathogenicity
Phenols - metabolism
Pinus - anatomy & histology
Pinus - microbiology
Pinus - physiology
Pinus nigra
Plant Diseases - microbiology
plant pathogenic fungi
secondary metabolites
signs and symptoms (plants)
Sphaeropsis
Sphaeropsis sapinea
systemic acquired resistance
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Summary:Systemic induced resistance (SIR) is a well-known host defense mechanism against pathogen attack in herbaceous plants, but SIR has only recently been documented in conifers. We tested if inoculation of Austrian pine (Pinus nigra Arnold) with Sphaeropsis sapinea (Fr.:Fr.) Dyko and Sutton or Diplodia scrobiculata de Wet, Slippers and Wingfield results in SIR or systemic induced susceptibility (SIS) to subsequent colonization by S. sapinea. Induction at the stem base resulted in significant (P < 0.01) SIR in the upper stem, and induction in the upper stem resulted in significant (P < 0.05) SIR at the stem base, indicating that SIR is bidirectional in Austrian pine. However, inoculation at the stem base resulted in significant (P < 0.01) SIS in shoot tips, demonstrating that, in the same host species, the expression of resistance can be organ-dependent, resulting in either SIR or SIS depending on the site of challenge infection. Systemic induced resistance in the stem was associated with induced lignification, supporting a potential role for this defense mechanism in disease resistance. Systemic induced susceptibility has been documented before, but this is the first demonstration of organ-dependent expression of both SIR and SIS in a tree or any other plant.
ISSN:0829-318X
1758-4469
DOI:10.1093/treephys/27.4.511