Biocontrol Potential of Forest Tree Endophytes

Terhonen, Eeva; Kovalchuk, Andriy; Zarsav, Artin; Asiegbu, Fred O.

doi:10.1007/978-3-319-89833-9_13

Cited by 22 publications

(25 citation statements)

References 183 publications

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“…Fungi display a wide spectrum of lifestyles ranging from beneficial mutualistic symbionts [37], latent endophytes [20,38,39], and benign saprotrophs [40] to devastating necrotrophic pathogens [41]. Both necrotrophic and saprotrophic lifestyles and the ability to form mutualistic symbiosis (e.g., mycorrhiza) or endophytic relationships can be found among diverse groupings of fungi at all taxonomic levels.…”

Section: Lifestyle and Phenotypic Plasticity Among Phytomycobiomesmentioning

confidence: 99%

Forest Tree Microbiomes and Associated Fungal Endophytes: Functional Roles and Impact on Forest Health

Terhonen

Blumenstein

Kovalchuk

et al. 2019

Forests

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172

113

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Terrestrial plants including forest trees are generally known to live in close association with microbial organisms. The inherent features of this close association can be commensalism, parasitism or mutualism. The term “microbiota” has been used to describe this ecological community of plant-associated pathogenic, mutualistic, endophytic and commensal microorganisms. Many of these microbiota inhabiting forest trees could have a potential impact on the health of, and disease progression in, forest biomes. Comparatively, studies on forest tree microbiomes and their roles in mutualism and disease lag far behind parallel work on crop and human microbiome projects. Very recently, our understanding of plant and tree microbiomes has been enriched due to novel technological advances using metabarcoding, metagenomics, metatranscriptomics and metaproteomics approaches. In addition, the availability of massive DNA databases (e.g., NCBI (USA), EMBL (Europe), DDBJ (Japan), UNITE (Estonia)) as well as powerful computational and bioinformatics tools has helped to facilitate data mining by researchers across diverse disciplines. Available data demonstrate that plant phyllosphere bacterial communities are dominated by members of only a few phyla (Proteobacteria, Actinobacteria, Bacteroidetes). In bulk forest soil, the dominant fungal group is Basidiomycota, whereas Ascomycota is the most prevalent group within plant tissues. The current challenge, however, is how to harness and link the acquired knowledge on microbiomes for translational forest management. Among tree-associated microorganisms, endophytic fungal biota are attracting a lot of attention for their beneficial health- and growth-promoting effects, and were preferentially discussed in this review.

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Section: Lifestyle and Phenotypic Plasticity Among Phytomycobiomesmentioning

confidence: 99%

Forest Tree Microbiomes and Associated Fungal Endophytes: Functional Roles and Impact on Forest Health

Terhonen

Blumenstein

Kovalchuk

et al. 2019

Forests

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172

113

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“…and closely related to B. acidiceler Peak et al, was also reported to reduce the mycelial growth of Phytophthora cinnamomi Rands, through the emission of antifungal diffusible and volatile compounds [41]. While the relevance of rhizobacteria for sustainable management in agricultural settings has been extensively highlighted, few studies have focused on forest tree-associated microbes for biocontrol application in forest management, despite the economic and ecological importance of forest ecosystems [57]. In the present study, we identified nine bacterial isolates with antifungal activity against the widespread fungal pathogens Fusarium spp.…”

Section: Discussionmentioning

confidence: 99%

Antifungal potential of Lauraceae rhizobacteria from a tropical montane cloud forest against Fusarium spp.

Reverchon

García-Quiroz²,

Guevara-Avendaño

et al. 2019

Braz J Microbiol

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The occurrence of pests and diseases can affect plant health and productivity in ecosystems that are already at risk, such as tropical montane cloudforests.Theuseofnaturallyoccurringmicroorganismsisapromisingalternativetomitigateforesttreefungalpathogens.Theobjectives ofthisstudyweretoisolaterhizobacteriaassociatedwithfiveLauraceaespeciesfromaMexicantropicalmontanecloudforestandtoevaluate their antifungal activity against Fusarium solani and F. oxysporum. Fifty-six rhizobacterial isolates were assessed for mycelial growth inhibition of Fusarium spp.throughdualculture assays.Thirty-three isolates significantly reduced the growth of F. solani,while 21 isolates inhibitedthatofF.oxysporum.Theninebacterialisolatesthatinhibitedfungalgrowthbymorethan20%wereidentifiedthrough16SrDNA gene sequence analysis; they belonged to the genera Streptomyces, Arthrobacter, Pseudomonas,andStaphylococcus. The volatile organic compounds (VOC) produced by these nine isolates were evaluated for antifungal activity. Six isolates (Streptomyces sp., Arthrobacter sp., Pseudomonas sp., and Staphylococcus spp.) successfully inhibited F. solani mycelial growth by up to 37% through VOC emission, while only the isolate INECOL-21 (Pseudomonas sp.) inhibited F. oxysporum. This work provides information on the microbiota of Mexican Lauraceae and is one of the few studies identifying forest tree-associated microbes with inhibitory activity against tree pathogens.

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“…We speculate that endophytes could have an important role in competing with P. fagi for the same substrate or could have a role in the development of necrosis. Additionally, endophytes could play a decisive role in combating the future spread of P. fagi across Europe, as is also known for other endophytic fungi [12,13]. As such, the role of endophytes in the development and spread of the disease caused by P. fagi should be investigated in the future.…”

Section: Discussionmentioning

confidence: 99%

Pseudodidymella fagi in Slovenia: First Report and Expansion of Host Range

Ogris

Brglez

Piškur

2019

Forests

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The fungus Pseudodidymella fagi is spreading in Europe and causing leaf blotch of European beech, Fagus sylvatica. Between 2008 and 2017, outbreaks of P. fagi were observed on European beech in Switzerland, Germany (also on F. orientalis), Austria, and Slovakia. In Slovenia, leaf blotch symptoms were first observed on F. sylvatica in 2018. P. fagi was identified as the causal agent of the observed symptoms in Slovenia by morphological examinations together with sequencing of the internal transcribed spacer (ITS) region of the rDNA. This study links the fungus to the expansion of the known distribution of the disease to Slovenia, and based on in vitro pathogenicity trials, also to a new potential host, Quercus petraea. The pathogenicity tests confirmed F. sylvatica and F. orientalis as hosts for P. fagi, but not Castanea sativa, where pathogenicity to F. orientalis was proved for first time in vitro. Although Koch’s postulates could not be proven for C. sativa, it seems to be partially susceptible in vitro because some of the inoculation points developed lesions. Additionally, damage to Carpinus betulus related to P. fagi near heavily infected beech trees was observed in vivo but was not tested in laboratory trials. Based on the results and our observations in the field, it is likely that P. fagi has a wider host range than previously thought and that we might be witnessing host switching.

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Biocontrol Potential of Forest Tree Endophytes

Cited by 22 publications

References 183 publications

Forest Tree Microbiomes and Associated Fungal Endophytes: Functional Roles and Impact on Forest Health

Forest Tree Microbiomes and Associated Fungal Endophytes: Functional Roles and Impact on Forest Health

Antifungal potential of Lauraceae rhizobacteria from a tropical montane cloud forest against Fusarium spp.

Pseudodidymella fagi in Slovenia: First Report and Expansion of Host Range

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