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Interaction of drought- and pathogen-induced mortality in Norway spruce and Scots pine

Gomez-Gallego, Mireia and Gomez-Gallego, Mireia and Galiano, Lucia and Martinez-Vilalta, Jordi and Stenlid, Jan and Capador-Barreto, Hernán Dario and Elfstrand, Malin and Camarero, J. Julio and Oliva, Jonas (2022). Interaction of drought- and pathogen-induced mortality in Norway spruce and Scots pine. Plant, Cell and Environment
[Research article]

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Abstract

Pathogenic diseases frequently occur in drought-stressed trees. However, their contribution to the process of drought-induced mortality is poorly understood. We combined drought and stem inoculation treatments to study the physiological processes leading to drought-induced mortality in Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) saplings infected with Heterobasidion annosum s.s. We analysed the saplings' water status, gas exchange, nonstructural carbohydrates (NSCs) and defence responses, and how they related to mortality. Saplings were followed for two growing seasons, including an artificially induced 3-month dormancy period. The combined drought and pathogen treatment significantly increased spruce mortality; however, no interaction between these stressors was observed in pine, although individually each stressor caused mortality. Our results suggest that pathogen infection decreased carbon reserves in spruce, reducing the capacity of saplings to cope with drought, resulting in increased mortality rates. Defoliation, relative water content and the starch concentration of needles were predictors of mortality in both species under drought and pathogen infection. Infection and drought stress create conflicting needs for carbon to compartmentalize the pathogen and to avoid turgor loss, respectively. Heterobasidion annosum reduces the functional sapwood area and shifts NSC allocation patterns, reducing the capacity of trees to cope with drought.

Authors/Creators:Gomez-Gallego, Mireia and Gomez-Gallego, Mireia and Galiano, Lucia and Martinez-Vilalta, Jordi and Stenlid, Jan and Capador-Barreto, Hernán Dario and Elfstrand, Malin and Camarero, J. Julio and Oliva, Jonas
Title:Interaction of drought- and pathogen-induced mortality in Norway spruce and Scots pine
Series Name/Journal:Plant, Cell and Environment
Year of publishing :2022
Number of Pages:14
Publisher:WILEY
ISSN:0140-7791
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:carbon starvation, conifer, drought-induced tree death, hydraulic failure, necrotrophic pathogen, sapwood
URN:NBN:urn:nbn:se:slu:epsilon-p-117568
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117568
Additional ID:
Type of IDID
DOI10.1111/pce.14360
Web of Science (WoS)000803829700001
ID Code:28475
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:18 Aug 2022 15:21
Metadata Last Modified:18 Aug 2022 15:31

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