Interaction of drought- and pathogen-induced mortality in Norway spruce and Scots pine
Gomez-Gallego, Mireia (Swedish University of Agricultural Sciences. Department of Forest Mycology and Plant Pathology)
Galiano, Lucía (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Martínez Vilalta, Jordi 1975- (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Stenlid, Jan (Swedish University of Agricultural Sciences. Department of Forest Mycology and Plant Pathology)
Capador-Barreto, Hernán D. (Swedish University of Agricultural Sciences. Department of Forest Mycology and Plant Pathology)
Elfstrand, Malin (Swedish University of Agricultural Sciences. Department of Forest Mycology and Plant Pathology)
Camarero, Jesús Julio (Instituto Pirenaico de Ecología)
Oliva, Jonàs (Universitat de Lleida. Departament de Ciència i Enginyeria Forestal i Agrícola)

Data:	2022
Resum:	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.
Ajuts:	Ministerio de Economía y Competitividad RYC-2015-17459
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Carbon starvation ; Conifer ; Drought-induced tree death ; Hydraulic failure ; Necrotrophic pathogen ; Sapwood
Publicat a:	Plant, cell & environment, Vol. 45, Issue 8 (August 2022) , p. 2292-2305, ISSN 1365-3040

DOI: 10.1111/pce.14360
PMID: 35598958

14 p, 3.7 MB

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