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The Involvement of Phytophthora Root Rot and Drought Stress in Holm Oak Decline: from Ecophysiology to Microbiome Influence

  • Francisco José Ruiz-GómezEmail author
  • Alejandro Pérez-de-Luque
  • Rafael María Navarro-Cerrillo
Physiological Processes (M Mencuccini, Section Editor)
Part of the following topical collections:
  1. Topical Collection on Physiological Processes

Abstract

Purpose of Review

Holm oak is a relevant species, both for its distribution and ecological importance. Among the risks looming over this species, oak decline—influenced by extreme climatic events, and alien-invasive species—is considered the main factor causing the loss of holm oak in Mediterranean open woodlands. The aim of this review is to identify and summarize the effects of drought and pathogen root rot, focusing on tree physiology, and the relationship between the stressors (biotic and abiotic) and the tree response.

Recent Findings

Symptoms of root rot are often associated with drought. However, it has been shown the presence of a differential response to root rot and severe drought is related with general defence mechanisms triggered by the plant. Soil microbiota has also been shown to be a key factor influencing health status and soil pathogen abundance. The application of next-generation sequencing techniques to forest pathology allows us to study complex relationships between soil, plant and microorganisms.

Summary

Tolerance of holm oak against Phytophthora cinnamomi root rot is related to specific hydric and photosynthetic mechanisms that differ from those associated with drought. This response involves changes in the metabolism of the photosynthetic organs of the plant which can be linked with changes in functional traits. Studies of the soil microbiome have identified several pathogens, apart from P. cinnamomi, involved in holm oak decline, and the relevance of key fungal species in the management of this syndrome. In this regard, the presence of beneficial microorganisms such as Trichoderma spp. or ectomycorrhizae influences the physiological status of trees affected by root rot.

Keywords

Climate change Drought Holm oak Physiology Phytophthora spp. Quercus spp. 

Notes

Acknowledgements

The authors thank the “Campus de Excelencia Agroalimentaria” (CeiA3); the University of Córdoba and the “Agencia de Medio Ambiente y Agua”; “Red SEDA”; and “Consejería de Agricultura, Ganadería, Pesca y Desarrollo Sostenible” (Junta de Andalucía) for their continuous support of the study of holm oak decline in the Andalusian territory.

Funding Information

The first author is supported by the project ESPECTRAMED (CGL2017-86161-R), funded by the Spanish Ministry of Economy, Industry and Competitiveness. We also thank Prof. Maurizio Mencuccini for his suggestion that we write this review, and Mr. Rafael Sánchez-Cuesta for allowing us access to unpublished data.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that there are no conflicts of interests.

Human and Animal Rights

This article does not contain any studies with human or animal subjects performed by any of the authors.

References

Papers of particular interest, published recently, have been highlighted as: • Of importance •• Of major importance

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Departamento de Ingeniería Forestal, Laboratorio de Ecofisiología de Sistemas Forestales ECSIFOR—ERSAFUniversidad de Córdoba Campus de RabanalesCórdobaSpain
  2. 2.Área de Genómica y BiotecnologíaIFAPA, Centro Alameda del ObispoCórdobaSpain

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