Endophytic fungi from the common walnut and their in vitro antagonistic activity against Ophiognomonia leptostyla

Yabaneri, Cafer; Sevim, Ali

doi:10.1007/s11756-022-01218-0

Cited by 4 publications

(1 citation statement)

References 52 publications

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“…Walnut orchards are usually affected by various pathogens, including Xanthomonas campestris pv. juglandis , which causes walnut blight, Ophiognomonia leptostyla and species from the Colletotrichum acutatum species complex, both responsible for walnut anthracnoses, as well as Geosmithia morbida , the causal agent of the “Thousand canker disease” [ 2 , 3 , 4 , 5 ]. Walnut dieback has also been frequently reported in California [ 6 ] as well as in Mediterranean-climate countries such as Spain [ 6 , 7 ], Italy [ 8 ], Turkey [ 9 ], and Czech Republic [ 10 ] over the past decade and more recently in France [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Profiling Walnut Fungal Pathobiome Associated with Walnut Dieback Using Community-Targeted DNA Metabarcoding

Belair

Pensec

Jany

et al. 2023

Plants

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Walnut dieback can be caused by several fungal pathogenic species, which are associated with symptoms ranging from branch dieback to fruit necrosis and blight, challenging the one pathogen–one disease concept. Therefore, an accurate and extensive description of the walnut fungal pathobiome is crucial. To this end, DNA metabarcoding represents a powerful approach provided that bioinformatic pipelines are evaluated to avoid misinterpretation. In this context, this study aimed to determine (i) the performance of five primer pairs targeting the ITS region in amplifying genera of interest and estimating their relative abundance based on mock communities and (ii) the degree of taxonomic resolution using phylogenetic trees. Furthermore, our pipelines were also applied to DNA sequences from symptomatic walnut husks and twigs. Overall, our results showed that the ITS2 region was a better barcode than ITS1 and ITS, resulting in significantly higher sensitivity and/or similarity of composition values. The ITS3/ITS4_KYO1 primer set allowed to cover a wider range of fungal diversity, compared to the other primer sets also targeting the ITS2 region, namely, GTAA and GTAAm. Adding an extraction step to the ITS2 sequence influenced both positively and negatively the taxonomic resolution at the genus and species level, depending on the primer pair considered. Taken together, these results suggested that Kyo set without ITS2 extraction was the best pipeline to assess the broadest fungal diversity, with a more accurate taxonomic assignment, in walnut organs with dieback symptoms.

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Section: Introductionmentioning

confidence: 99%

Profiling Walnut Fungal Pathobiome Associated with Walnut Dieback Using Community-Targeted DNA Metabarcoding

Belair

Pensec

Jany

et al. 2023

Plants

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Fusarium and Hazelnut: A Story of Twists and Turns

Zimowska,

Ludwiczuk,

Manganiello

et al. 2024

Agriculture

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In recent years, the number of reports of Fusarium in association with hazelnut (Corylus avellana) has been increasing worldwide, related to both pathogenic aptitude and endophytic occurrence. However, the assessment of the real ecological role and relevance to plant health of these fungi has been impaired by uncertainty in species identification, deriving from both the evolving taxonomic structure of the genus and an inaccurate use of molecular markers. In this paper, the characterization of two hazelnut endophytic strains isolated in Poland is reported with reference to their secondary metabolite profiles and interactions with pests and pathogens. Our results are indicative of a possible role of these strains in defensive mutualism which could be related to the production of several bioactive compounds, especially cyclohexadepsipeptides of the enniatin family. At the same time, these biochemical properties create some concern for the possible mycotoxin contamination of hazelnut products.

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Nature’s Antimicrobial Arsenal: Non-Ribosomal Peptides from PGPB for Plant Pathogen Biocontrol

et al. 2023

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Non-ribosomal peptides (NRPs) are a diverse group of bioactive compounds synthesized by microorganisms, and their antimicrobial properties make them ideal candidates for use as biocontrol agents against pathogens. Non-ribosomal peptides produced by Plant-Growth-Promoting Bacteria (PGPB) have gained interest for the biocontrol of plants’ bacterial and fungal pathogens. In this review, the structure and mode of action of NRPs, including their characterization and the characterization of NRP-producing microorganisms, are discussed. The use of NRPs in soilless agriculture and their potential as part of a sustainable plant disease control strategy are also highlighted. In addition, the review debates the commercial aspects of PGPB’s formulations and their potential as a biocontrol agent. Overall, this review emphasizes the importance of NRPs derived from PGPB in the biocontrol of plant pathogens and their potential to be used as an environmentally friendly and sustainable plant disease control strategy.

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Endophytic fungi from the common walnut and their in vitro antagonistic activity against Ophiognomonia leptostyla

Cited by 4 publications

References 52 publications

Profiling Walnut Fungal Pathobiome Associated with Walnut Dieback Using Community-Targeted DNA Metabarcoding

Profiling Walnut Fungal Pathobiome Associated with Walnut Dieback Using Community-Targeted DNA Metabarcoding

Fusarium and Hazelnut: A Story of Twists and Turns

Nature’s Antimicrobial Arsenal: Non-Ribosomal Peptides from PGPB for Plant Pathogen Biocontrol

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