Interspecific Soil Water Partitioning as a Driver of Increased Productivity in a Diverse Mixed Mediterranean Forest

Rog, Ido; Tague, Christina; Jakoby, Gilad; Megidish, Shacham; Yaakobi, Assaf; Wagner, Yael; Klein, Tamir

doi:10.1029/2021jg006382

Cited by 14 publications

(31 citation statements)

References 75 publications

(108 reference statements)

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“…In addition, tree species vary in their spatial root distribution. In our system, Quercus is more deep rooted than Pinus (Rog, Tauge, et al, 2021). This variation can also affect resource sharing by CMNs.…”

Section: Discussionmentioning

confidence: 86%

“…In addition, we had three pots with an individual tree for each of the species. The five tree species studied in the experiment are dominant in the Mediterranean forest (Lapidot et al, 2019; Rog, Tague, et al, 2021) and share territory in many other mixed evergreen forests. Pinus halepensis and Cupressus sempervirens are gymnosperms, Quercus calliprinos , Ceratonia siliqua , and Pistacia lentiscus are evergreen angiosperms.…”

Section: Methodsmentioning

confidence: 99%

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Asymmetric belowground carbon transfer in a diverse tree community

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Roots of vascular plants interact with mycorrhizal fungi along withother components of the soil microbiome including nonmycorrhizal fungi, archaea, and bacteria (Högberg et al., 2008). The symbiotic interaction between the fungus and the root relies on transmission of soil-derived nutrients from the fungus to the host tree (Collins Johnson et al., 2010), increasing root absorption of water by the fungal hyphae and mediating the interaction of the root with other microbes in the soil (Aroca et al., 2007;Hestrin et al., 2019). The heterotrophic fungus benefits from the interaction by receiving carbon from the autotrophic host tree (Högberg et al., 2008). There are two main functional groups of mycorrhizae: ectomycorrhiza (EM) which do not penetrate the root cortex of the host and interact mainly with trees that are located in seasonally cold and dry climates, and arbuscular mycorrhiza (AM) whose hyphae penetrate the root cortex and interact mainly with plants that are located in seasonally warm and wet climates (Steidinger et al., 2019). Each individual tree may

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Section: Discussionmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Asymmetric belowground carbon transfer in a diverse tree community

et al. 2022

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“…We argue, however, that studying saplings is equally important, as establishment is often the bottleneck for tree survival in the forest ( Pozner et al, 2022 ), and it is the period where microbial partners make the most difference. This is increasingly important in the case of shallow-rooted tree species such as C. sempervirens ( Rog et al, 2021 ). In the forest, mycorrhizal fungi, which were missing here, can have large effects too ( Meier et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

A dynamic rhizosphere interplay between tree roots and soil bacteria under drought stress

Oppenheimer-Shaanan

Jakoby

Starr

et al. 2022

eLife

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Root exudates are thought to play an important role in plant-microbial interactions. In return for nutrition, soil bacteria can increase the bioavailability of soil nutrients. However, root exudates typically decrease in situations such as drought, calling into question the efficacy of solvation and bacteria-dependent mineral uptake in such stress. Here we tested the hypothesis of exudate-driven microbial priming on Cupressus saplings grown in forest soil in custom-made rhizotron boxes. A 1-month imposed drought and concomitant inoculations with a mix of Bacillus subtilis and Pseudomonas stutzeri, bacteria species isolated from the forest soil, were applied using factorial design. Direct bacteria counts and visualization by confocal microscopy showed that both bacteria associated with Cupressus Interestingly, root exudation rates increased 2.3-fold with bacteria under drought, as well as irrigation. Forty four metabolites in exudates were significantly different in concentration between irrigated and drought trees, including phenolic acid compounds and quinate. When adding these metabolites as carbon and nitrogen sources to bacterial cultures of both bacterial species, 8 of 9 metabolites stimulated bacterial growth. Importantly, soil phosphorous bioavailability was maintained only in inoculated trees, mitigating drought-induced decrease in leaf phosphorus and iron. Our observations of increased root exudation rate when drought and inoculation regimes were combined, support the idea of root recruitment of beneficial bacteria, especially under water stress.

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“…Tree diversity and population dynamics are known to be affected by the resident mycorrhizal fungal community’s composition (Tedersoo et al 2020), while the direct mechanisms and the mycorrhizal community characteristics and their effects on forest structure are less understood. In this study, we examined the diversity of a mycorrhizal community in a forest plot containing a mixture of EMF- and AMF-host trees that live in close proximity and share many available resources (Rog et al 2021b). We show that some “classical” AMF-host species, like Cupressus and Pistacia , associate also with several EMF species (e.g., Inocybe and Tuber species) (Figs.…”

Section: Discussionmentioning

confidence: 99%

Prosperity of the commons: Generalist mycorrhizal species dominate a mixed forest and may promote forest diversity by mediating resource sharing among trees

Rog

Lewin‐Epstein

Livne-Luzon

et al. 2022

Preprint

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Mechanisms of host-microbe interactions and their direct impact on both parties have been extensively researched, however, much less is known on the effect of these interactions on the ecology of the host-community. Here we investigate tree-fungi mycorrhizal interactions, focusing on mycorrhizal-meditated resource sharing among trees, while examining the dynamics between specialist and generalist fungi and their implications on the forest ecology. Using genetic meta-barcoding, we identified the fungal community colonizing different trees in a mixed forest, and generated an extensive mapping connecting fungal sequences to their tree hosts. The mycorrhizal fungal community diverged between ectomycorrhizal and arbuscular host trees, but, unexpectedly, multiple ectomycorrhizal species colonized roots of non-ectomycorrhizal host trees. We complemented these findings by a novel computational framework, modeling competition between generalist and specialist mycorrhizal fungi, accounting for fungal-mediated resource sharing among neighboring trees. The analysis of the model revealed that generalist mycorrhizal networks may affect the entire tree community, and contribute to the maintenance of forest diversity in the long run. Furthermore, higher initial spatial mixing of trees can promote the evolution of generalist mycorrhizal species. These novel belowground interactions among trees and fungi may significantly impact forest biodiversity.

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Interspecific Soil Water Partitioning as a Driver of Increased Productivity in a Diverse Mixed Mediterranean Forest

Cited by 14 publications

References 75 publications

Asymmetric belowground carbon transfer in a diverse tree community

Asymmetric belowground carbon transfer in a diverse tree community

A dynamic rhizosphere interplay between tree roots and soil bacteria under drought stress

Prosperity of the commons: Generalist mycorrhizal species dominate a mixed forest and may promote forest diversity by mediating resource sharing among trees

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