Shifts in the structure of rhizosphere bacterial communities of avocado after Fusarium dieback

Bejarano-Bolívar, Alix Adriana; Lamelas, Araceli; Aguirre‐von‐Wobeser, Eneas; Sánchez-Rangel, Diana; Méndez-Bravo, Alfonso; Eskalen, Akif; Reverchon, Frédérique

doi:10.1016/j.rhisph.2021.100333

Cited by 14 publications

(6 citation statements)

References 77 publications

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“…In addition, the relative abundance of the bacterial phylum Armatimonadetes was positively correlated with the target seedling biomass (Figure 5a). This result is supported by previous studies showing that Armatimonadetes was positively correlated with plant growth [63] by protecting against fungal pathogens [64] and decomposing plant materials and photosynthetic substances [65]. Furthermore, pioneer tree seedlings possessed the highest relative biomass in E. quinqueflorus soils with the highest relative abundance of the fungal genus Acremonium (Figure S1).…”

Section: Discussionsupporting

confidence: 86%

Soil Microbial and Organic Carbon Legacies of Pre-Existing Plants Drive Pioneer Tree Growth during Subalpine Forest Succession

Liang

Zhao

Kou

et al. 2022

Forests

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Fast-growing pioneer tree species play a crucial role in triggering late successional development in forests. Experimental evidence of the soil legacy effects of pre-existing plants on pioneer tree performance is lacking. We explored the legacy effects of soils conditioned by early successional herbs (Poa poophagorum Bor and Potentilla fragarioides L.) and mid-successional shrubs (Rhododendron fortunei Lindl. and Enkianthus quinqueflorus Lour.) on late-successional ectomycorrhizal (ECM) pioneer tree (Betula platyphylla Sukaczev) seedling growth. The soils were analyzed for soil nutrient status and fungal and bacterial compositions using ITS and 16S rRNA gene sequencing. B. platyphylla seedlings produced higher biomass in soils conditioned by shrubs. Soil organic carbon (SOC) and bacterial and fungal legacies most impacted pioneer tree seedling growth. Additionally, the partial least squares path model revealed that soil nutrients, especially SOC, indirectly affected seedling biomass by their direct effects on the bacterial and fungal communities. The changes in bacterial community composition had a stronger effect on seedling biomass than those of fungi because bacteria with shorter turnover times are generally considered to be more efficient than fungi in enhancing nutrient availability. Our study integrates soil microbial and nutrient legacies to explain the potential mechanisms of pioneer tree regeneration.

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Section: Discussionsupporting

confidence: 86%

Soil Microbial and Organic Carbon Legacies of Pre-Existing Plants Drive Pioneer Tree Growth during Subalpine Forest Succession

Liang

Zhao

Kou

et al. 2022

Forests

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“…For instance, signi cant negative correlations between Armatimonadetes with disease index of bacterial wilt were observed in tobacco (Chen et al, 2020) and vanilla (Xiong et al, 2015). Furthermore, the relative abundance of Armatimonadetes was found to be enriched following yellow mosaic disease infection in wheat (Wu et al, 2021) and was exclusively associated with the rhizosphere of asymptomatic avocado trees in an orchard infected with Fusarium dieback (Bejarano-Bolívar et al, 2021). Despite these relationships between cover cropping measurements and rotational values, our experimental design was unable to determine if these relationships were correlative or causational.…”

Section: Rotational Valuementioning

confidence: 99%

Improving Rotational Partners: intraspecies variation for pea cover cropping traits

Marques¹,

Kerwien²,

Bueno³

et al. 2022

Preprint

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Purpose: To improve cover crops as rotational partners, intraspecies variation for cover cropping traits such as nutrient mobilization, carbon deposition, and beneficial microbial recruitment must be identified. The majority of research on cover crops has focused on interspecies comparisons for cover cropping variation with minimal research investigating intraspecies variation. Methods: To address if variation of cover cropping traits is present within a cover cropping species, we grew 15 diverse accessions (four modern cultivars, three landraces, eight wild accessions) of pea in an organic setting. We measured various cover cropping traits such as nutrient mobilization, soil organic matter deposition, microbial recruitment, and quantified the effect of pea accession on the growth and yield of a subsequently planted corn crop. Results: We found that domestication history and genotype of pea had a significant effect on soil properties: C%, N%, manganese, magnesium, sodium, calcium, and effective CEC, and the yield of the subsequent corn crop. Additionally, no variation for prokaryotic recruitment (alpha and beta diversity) was observed within pea, however we did observe significant variation for fungal recruitment (alpha and beta diversity) due to domestication and accession. In conclusion, our results revealed the presence of intraspecies variation for cover cropping traits which, may have impacted the rotational values of pea accessions. Conclusions: Our results demonstrate that cover crops can be improved as rotational partners to ultimately boost crop yields in sustainable agroecosystems.

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“…Insect and host-plant microbiome studies thus have the potential to shed some light on the complex ecological interactions existing within microbial communities and could consequently help us elucidate how these microbiomes could be manipulated to enhance plant resistance to ambrosia beetles and their associated fungi. Our work on the avocado rhizosphere microbiome has shown that Fusarium dieback decreases the richness and diversity of rhizosphere microbial communities and significantly changed community structure, reducing the abundance of genera such as Sporocytophaga and Cellvibrio, which have been associated with plant growth promotion and chitinase production (Bejarano-Bolívar et al, 2021). However, some potential biocontrol agents such as Myxococcus sp.…”

Section: Microbiome Approaches To Steer Beneficial Microorganismsmentioning

confidence: 99%

“…and Lysobacter sp. were exclusively detected in the rhizosphere of infected trees and should be further tested in antagonism assays (Bejarano-Bolívar et al, 2021). The characterization of the avocado bark microbiome has also highlighted the abundance of bacteria with antifungal activity in the bark environment, such as Sphingomonas or Methylobacterium, which could play a potential role in the biocontrol of Fusarium dieback in avocado trees (Aguirre-von-Wobeser et al, 2021).…”

Section: Microbiome Approaches To Steer Beneficial Microorganismsmentioning

confidence: 99%

Microbial Biocontrol Strategies for Ambrosia Beetles and Their Associated Phytopathogenic Fungi

Reverchon

Contreras-Ramos²,

Eskalen

et al. 2021

Front. Sustain. Food Syst.

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Ambrosia beetles and their symbiotic fungi are causing severe damage in natural and agro-ecosystems worldwide, threatening the productivity of several important tree crops such as avocado. Strategies aiming at mitigating their impact include the application of broad-spectrum agrochemicals and the incineration of diseased trees, but the increasing demand for environment-friendly strategies call for exploring biological control for the management of ambrosia beetles and their phytopathogenic fungal symbionts. The aim of this review is to examine the existing knowledge on biocontrol approaches using beneficial microorganisms and microbial natural products with entomopathogenic and antifungal activity against ambrosia beetles and fungi. We show that biocontrol has been mainly focused on the insect, using entomopathogenic fungi (EPF) such as Beauveria spp. or Metarhizium spp. However, recent studies have been integrating EPF with mycoparasitic fungi such as Trichoderma spp. to simultaneously challenge the vector and its fungal symbionts. Novel approaches also include the use of microbial natural products as insect lures or antifungal agents. Contrastingly, the potential of bacteria, including actinobacteria (actinomycetes), as biocontrol agents of ambrosia fungi has been little investigated. We thus suggest that future research should further examine the antifungal activity of bacterial strains, with an emphasis on harsh environments. We also suggest pursuing the isolation of more effective microbial strains with dual biocontrol effect, i.e., exhibiting fungicidal/insecticidal activities. Moreover, additional efforts should aim at determining the best application methods of biocontrol agents in the field to ensure that the positive effects detected in vitro are sustained. Finally, we propose the integration of microbiome studies in pest and disease management strategies as they could provide us with tools to steer the beneficial host plant microbiome and to manipulate the beetle microbiome in order to reduce insect fitness.

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Shifts in the structure of rhizosphere bacterial communities of avocado after Fusarium dieback

Cited by 14 publications

References 77 publications

Soil Microbial and Organic Carbon Legacies of Pre-Existing Plants Drive Pioneer Tree Growth during Subalpine Forest Succession

Soil Microbial and Organic Carbon Legacies of Pre-Existing Plants Drive Pioneer Tree Growth during Subalpine Forest Succession

Improving Rotational Partners: intraspecies variation for pea cover cropping traits

Microbial Biocontrol Strategies for Ambrosia Beetles and Their Associated Phytopathogenic Fungi

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