Rhizosphere mycobiome diversity in four declining Mediterranean tree species

Frontiers in Forests and Global Change

Forests and Global Change

Irene Teresa Bocos-Asenjo¹  Julio Javier Diez¹  Jonatan Niño-Sanchez¹  Pablo Martín-Pinto¹  Jorge Poveda¹  Sergio Diez-Hermano¹  Álvaro Peix² 

[1] Department of Plant Production and Forest Resources, Sustainable Forest Management Research Institute (iuFOR). Higher Technical School of Agricultural Engineering (ETSIIAA), University of Valladolid, Palencia, Spain;Instituto de Recursos Naturales y Agrobiología, IRNASA-CSIC, Salamanca, Spain;Grupo de Interacción Planta-Microorganismo, USAL, Unidad Asociada al CSIC por el IRNASA, Salamanca, Spain;

关键词: global change;    forest declines;    metabarcoding;    biodiversity;    forest pathology;    Quercus;    Castanea;   

DOI  :  10.3389/ffgc.2023.1215701

 received in 2023-05-02, accepted in 2023-09-25,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionForests in the Mediterranean basin are currently in decline. Their resilience has been eroded as a result of climate change and anthropogenic impacts, making them vulnerable to increasingly frequent episodes of drought, fire and the spread of pests and diseases. The impact of these natural and anthropogenic events on soil biodiversity is of particular concern, as the soil fungal community plays a key role in ecosystem homeostasis.Objectives and methodsIn order to analyse the relationship between soil health status and fungal diversity, soil samples were collected from declining Mediterranean forests of Castanea sativa (chestnut), Quercus ilex (holm oak), Quercus suber (cork oak) and Quercus pyrenaica (Pyrenean oak). A metabarcoding study was carried out by sequencing the ITS genomic region.ResultsA total of 674 fungal genera were found. It has not been possible to explain the differences in health status from the fungal genera found exclusively on declining forest soils, as none of them have been described as pathogenic. Healthy chestnut soils were characterized by a high alpha diversity and a higher abundance of the genus Metarhizium. No differentially abundant genera were found in any of the other forest species tested. Declining chestnut soils harbored more abundance of ectomycorrhizae and soil saprotrophs than healthy samples. Ectomycorrhizae were the dominant lifestyle in all oak species regardless of health status, whereas arbuscular mycorrhizae were preferentially found in declining cork oak soils.DiscussionThis work highlights the resilience of fungal communities of soil against decline and highlights the need to further investigate its relationship with the forest’s ability to cope with the challenges of climate change.

【 授权许可】

Unknown   
Copyright © 2023 Diez-Hermano, Poveda, Niño-Sanchez, Bocos-Asenjo, Peix, Martín-Pinto and Diez.