The rhizosphere microbiome: A key component of sustainable cork oak forests in trouble

Maghnia, Fatima Zahra; Abbas, Younes; Mahé, Frédéric; Prin, Yves; Ghachtouli, Naïma El; Duponnois, Robin; Sanguin, Hervé

doi:10.1016/j.foreco.2018.12.002

Cited by 24 publications

(18 citation statements)

References 145 publications

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“…This cork oak density and tree distribution are closely related to water availability. Climate changes, such as increased temperatures and reduction of water availability, are currently posing a challenge to cork oak forests (reviewed by Reis et al 2017;Maghnia et al 2019). Since a reduction in water availability is expected soon (Malek and Verburg 2018), decrease in Q. suber growth and productivity, as well as the long-term sustainability of these ecosystems, may be further threatened (Acácio et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Bacteria could help ectomycorrhizae establishment under climate variations

et al. 2021

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Rhizosphere microbiome is one of the main sources of plant protection against drought. Beneficial symbiotic microorganisms, such as ectomycorrhizal fungi (ECMF) and mycorrhiza helper bacteria (MHB), interact with each other for increasing or maintaining host plant fitness. This mutual support benefits all three partners and comprises a natural system for drought acclimation in plants. Cork oak (Quercus suber L.) tolerance to drought scenarios is widely known, but adaptation to climate changes has been a challenge for forest sustainability protection. In this work, ECMF and MHB communities from cork oak forests were cross-linked and correlated with climates. Cenococcum, Russula and Tuber were the most abundant ECMF capable of interacting with MHB (ECMF~MHB) genera in cork oak stands, while Bacillus, Burkholderia and Streptomyces were the most conspicuous MHB. Integrating all microbial data, two consortia Lactarius/Bacillaceae and Russula/Burkholderaceae have singled out but revealed a negative interaction with each other. Russula/Burkholderaceae might have an important role for cork oak forest sustainability in arid environments, which will be complemented by the lower drought adaptation of competitive Lactarius/Bacillaceae. These microbial consortia could play an essential role on cork oak forest resilience to upcoming climatic changes.

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Section: Introductionmentioning

confidence: 99%

Bacteria could help ectomycorrhizae establishment under climate variations

et al. 2021

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“…For facing the upcoming climate changes, the microbial community present in the soil of cork oak forests has been recognized as one of the main drivers for forest sustainability (Reis et al, 2017;Maghnia et al, 2019). Different soil layers are enriched with microbes displaying different lifestyles.…”

Section: Introductionmentioning

confidence: 99%

Climatic impacts on the bacterial community profiles of cork oak soils

Reis

Soares-Castro

Costa

et al. 2019

Applied Soil Ecology

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Climate changes comprise increasing global temperature and water cycle deregulation (precipitation storms and long dry seasons). Many affected ecosystems are located within the Mediterranean basin, where cork oak (Quercus suber L.) is one of the most important forest ecosystems. Despite cork oak tolerance to drought, the decrease of water availability and increase of temperature is causing a serious decline of cork oak populations. In the present work, the bacterial community of cork oak soils was assessed by metabarcoding using Illumina Miseq. Soils from seven independent cork oak forests were collected along a climate gradient. In all forest soils, Proteobacteria and Actinobacteria were the richest and more abundant bacteria. Acidobacteria also presented a high relative abundance, and Chloroflexi was a rich phylum. The soil bacterial community diversity and composition was strongly affected by the climatic region where cork oak resides and specific bacterial taxa were differently affected by precipitation and temperature. Accordingly, cork oak bacterial communities clustered into three distinct groups, related with humid, sub-humid and arid/semi-arid climates. Driest and warmer forests presented more diverse bacterial communities than humid and coolest forests. However, driest climates presented more homogenous bacterial communities among forests than humid climates. Climate (mainly precipitation) revealed to be the strongest driver leading to significant variations of bacterial community profiles. The most impacted bacterial taxa by climatic variables were Proteobacteria, in particular Gammaproteobacteria and Deltaproteobacteria, Chloroflexi, and Firmicutes. Humid forests presented mainly Acidobacteria as good indicators of climate, whereas Actinobacteria members were better indicators for arid forests (mainly Gaiellales and Frankiales). Some indicator species for different climate conditions were members of the bacterial core of cork oak stands (7% of the total bacterial community). Taken together, different microbiomes were selected by the climate conditions in cork oak stands along a climate gradient and might provide the key to forest sustainability in times of global warming. challenge to cork oak forests (reviewed by Reis et al., 2017; Maghnia et al., 2019). An adaptation of cork oak populations to drier and warmer conditions is expectable (Varela et al., 2015), but the decline of existing populations have been described all over Mediterranean basin (reviewed by Reis et al., 2017). From the huge diversity of microbes present in cork oak soils, fungal communities are those more related with water transfer and increasing water availability to plants. This is mostly due to the ability of ectomycorrhizal fungi to become associated to cork oak roots, promoting water and nutrients transfer (Reis et al., 2017). However, bacteria also play an important ecological role on forest soils. Besides being important for decomposition of organic matter, N fixation, mineral weathering and consequently the release of inorg...

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“…Experiences in extant oak woodlands and nurseries have shown that the establishment success of young oak trees by germination from acorns is mostly superior to that by plantation of seedlings. This is explained by the lower costs and especially by the fact that juvenile oaks derived from in-site germination commonly have a root system which is better adapted to interact with the local microbiome (Maghnia et al 2019).…”

Section: Forest Structurementioning

confidence: 99%

‘Back to the Future’—Oak wood-pasture for wildfire prevention in the Mediterranean

Bergmeier¹,

Capelo²,

Pietro³

et al. 2021

Plant Sociology

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In the summer of 2021, enormous wildfires in the Mediterranean eliminated huge areas of mainly coniferous forest, destroyed adjacent settlements and claimed the lives of many people. The fires indicate effects of climate change and expose consequences of rural demographic changes, deficits in regional and touristic development planning and shortcomings in forest policy. This forum article highlights the dimensions of the problem, calls for a paradigm shift and shows solutions. Land abandonment, woody plant encroachment and non-reflective afforestation are leading to increasing amounts of combustible biomass. To prevent disastrous fires in future, fundamental changes in tree species composition, forest structure and management are essential. Plantations of reseeding pines are to be substituted by spacious or periodically open woodlands of long-lived trees with resprouting capacity such as Mediterranean oaks. Biomass-reducing practices including wood-pasture have to be revived in rural and peri-urban areas. Exemplary fire-resistant multifunctional oak woodlands occur throughout the Mediterranean. Urgent and medium-term measures in the burnt areas include promoting natural ecosystem regeneration, developing regionalized seed banks and nurseries to support native genetic resources, fostering vegetation mosaics of groves and multiple-use open and coppice woodland maintained by traditional practices, and in general forest management aiming at fuel biomass reduction and a policy counteracting land abandonment.

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The rhizosphere microbiome: A key component of sustainable cork oak forests in trouble

Cited by 24 publications

References 145 publications

Bacteria could help ectomycorrhizae establishment under climate variations

Bacteria could help ectomycorrhizae establishment under climate variations

Climatic impacts on the bacterial community profiles of cork oak soils

‘Back to the Future’—Oak wood-pasture for wildfire prevention in the Mediterranean

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