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Scots Pines With Tolerance to Melampsora pinitorqua and Diplodia sapinea Show Distinct Metabolic Profiles.

Scots Pines With Tolerance to Melampsora pinitorqua and Diplodia sapinea Show Distinct Metabolic Profiles.

Authors :
Stein Åslund, Matilda
Reichelt, Michael
Zhang, Ke
Castaño, Carles
Stenlid, Jan
Gershenzon, Jonathan
Elfstrand, Malin
Source :
Plant, Cell & Environment. Feb2025, Vol. 48 Issue 2, p1479-1493. 15p.
Publication Year :
2025

Abstract

Diplodia sapinea causes Diplodia tip blight (DTB) and is recognised as an opportunistic necrotrophic pathogen affecting conifers. While DTB is associated with abiotic stress, the impact of biotic stress in the host on D. sapinea's lifestyle shift is unknown. Observed co‐occurrences of D. sapinea and Melampsora pinitorqua, causing pine twisting rust on Scots pine (Pinus sylvestris), instigated an investigation into their interaction with and influence on the defence mechanisms of the host. We hypothesised that M. pinitorqua infections predispose the trees to D. sapinea by stressing the host and altering the shoot metabolites. Pines in a plantation were sampled over time to study pathogen biomass and host metabolites. Symptoms of both pathogens were consistent over years, and the preceding season's symptoms affected the metabolic profiles pre‐infection and M. pinitorqua's proliferation. Symptoms of M. pinitorqua altered shoot metabolites more than fungal biomass, with co‐symptomatic trees exhibiting elevated M. pinitorqua biomass. Specific phenolic compounds had a strong positive association with the shoot symptom × D. sapinea interaction. D. sapinea's biomass presymptoms was independent of previous disease symptoms and infection by M. pinitorqua. Some trees showed disease tolerance, with delayed rust infections and minimal DTB symptoms. Further investigations on this trait are needed. Summary statement: This study examines the dynamics of disease outbreaks caused by the emerging pathogen D. sapinea in Scots pines in northern Europe, concurrently infected by the native pathogen M. pinitorqua. Disease symptoms vary across the studied trees, from severely affected trees to those that show tolerance by delayed rust infections and low Diplodia tip blight disease levels. Disease symptoms persist over the years and predict the pathogen dynamics, phenolic profiles and tree vitality. M. pinitorqua infection does not directly impact D. sapinea colonisation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01407791
Volume :
48
Issue :
2
Database :
Academic Search Index
Journal :
Plant, Cell & Environment
Publication Type :
Academic Journal
Accession number :
182049058
Full Text :
https://doi.org/10.1111/pce.15218