Identification and characterization of Alternaria alternata causing leaf spot of olive tree ( Olea europaea ) in Turkey

Basım, Esin; Basım, Hüseyin; Abdulai, Muntala; Baki, Derya; Öztürk, Nurhan

doi:10.1016/j.cropro.2016.10.013

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…This is a generalist saprobe fungal species, but also contains several variants, which cause necrotic diseases on different plants 41 . Fusarium and Alternaria genera include fungal species that have been recently reported to cause olive tree diseases with minor importance 42,43 . The role of these fungal taxa associated to either asymptomatic or symptomatic twigs, on olive tree’s defense against OK disease remains a topic for further study.…”

Section: Discussionmentioning

confidence: 99%

Bacterial disease induced changes in fungal communities of olive tree twigs depend on host genotype

Gomes

Pereira

Lino-Neto

et al. 2019

Sci Rep

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In nature, pathogens live and interact with other microorganisms on plant tissues. Yet, the research area exploring interactions between bacteria-fungi and microbiota-plants, within the context of a pathobiome, is still scarce. In this study, the impact of olive knot (OK) disease caused by the bacteria Pseudomonas savastanoi pv. savastanoi (Psv) on the epiphytic and endophytic fungal communities of olive tree twigs from three different cultivars, was investigated in field conditions. The ITS-DNA sequencing of cultivable fungi, showed that OK disease disturbs the resident fungal communities, which may reflect changes in the habitat caused by Psv. In particular, a reduction on epiphyte abundance and diversity, and changes on their composition were observed. Compared to epiphytes, endophytes were less sensitive to OK, but their abundance, in particular of potential pathogens, was increased in plants with OK disease. Host genotype, at cultivar level, contributed to plant fungal assembly particularly upon disease establishment. Therefore, besides fungi - Psv interactions, the combination of cultivar - Psv also appeared to be critical for the composition of fungal communities in olive knots. Specific fungal OTUs were associated to the presence and absence of disease, and their role in the promotion or suppression of OK disease should be studied in the future.

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Section: Discussionmentioning

confidence: 99%

Bacterial disease induced changes in fungal communities of olive tree twigs depend on host genotype

Gomes

Pereira

Lino-Neto

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…were present in both symptomatic and asymptomatic plants, in asymptomatic plants over 90% of the isolates are represented by these two OTUs, as opposed to 11% in symptomatic plants. Despite some Alternaria species having been reported to cause damages on olive [38,39,40,41], most species are saprophytic and/or endophytic. In this study no typical symptoms of pathogenicity caused by Alternaria sp.…”

Section: Discussionmentioning

confidence: 99%

Fungal Communities Associated with Peacock and Cercospora Leaf Spots in Olive

Varanda

Materatski

Landum

et al. 2019

Plants

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Venturia oleaginea and Pseudocercospora cladosporioides are two of the most important olive fungal pathogens causing leaf spots: peacock spot, and cercosporiosis, respectively. In the present study, fungal communities associated with the presence of these pathogens were investigated. Overall, 300 symptomatic and asymptomatic trees from different cultivars were sampled from Alentejo, Portugal. A total of 788 fungal isolates were obtained and classified into 21 OTUs; Ascomycota was clearly the predominant phylum (96.6%). Trees from cultivar ‘Galega vulgar’ showed a significant higher fungal richness when compared to ‘Cobrançosa’, which in turn showed significant higher values than ‘Picual’. Concerning plant health status, symptomatic plants showed significant higher fungal richness, mainly due to the high number of isolates of the pathogens V. oleaginea and P. cladosporioides. In terms of fungal diversity, there were two major groups: ca. 90% of the isolates found in symptomatic plants belonged to V. oleaginea, P. cladosporioides, Chalara sp., and Foliophoma sp. while ca. 90% of the isolates found in asymptomatic plants, belonged to Alternaria sp. and Epicoccum sp. This study highlights the existence of different fungal communities in olive trees, including potential antagonistic organisms that can have a significant impact on diseases and consequently on olive production.

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“…MGI and SI rates (%) of endophytic fungal isolates against oak wilt fungus decreased in the order of E409 (Colletotrichum acutatum), E089 (Daldinia childiae), E415 (Alternaria alternata), E199 (Daldinia childiae), and E282 (Nectria balsamea). Numerous studies have described morphological and molecular characterization of these fungal species [30][31][32][33]. However, these studies frequently focused on the pathogenicity of these species.…”

Section: Endophytic Fungi Against Oak Wiltmentioning

confidence: 99%

Screening of Endophytic Fungal Isolates Against Raffaelea quercus-mongolicae Causing Oak Wilt Disease in Korea

et al. 2020

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Oak wilt disease caused by Raffaelea quercus-mongolicae has emerged obviously in Korea. We selected antifungal isolates against R. quercus-mongolicae among 368 endophytic fungal isolates from different parts of oak and pine trees. The experiment was conducted in the primary and secondary screenings by dual culture test. The antifungal activity of the selected isolates was assessed in culture filtrate test based on the inhibition rates in mycelial growth, sporulation, and spore germination of oak wilt fungus. Five isolates, E089, E199, E282, E409 and E415, showed strong antifungal activity in culture filtrate test, and their antifungal activity decreased on the culture media supplemented with heated culture filtrate. Higher mycelial growth inhibitions on the unheated media were recorded in E409 (Colletotrichum acutatum), E089 (Daldinia childiae), E415 (Alternaria alternata) and E199 (Daldinia childiae) with the inhibition rates of 79.0%, 70.1%, 68.9% and 64.5%, respectively. These isolates also had the higher sporulation inhibitions on unheated media with the rates of 96.8%, 84.2%, 82.8% and 80.5%, respectively. The spore germination of the oak wilt fungus was completely inhibited by E282 (Nectria balsamea) on both unheated and heated media. These results showed that a higher number of potent antifungal isolates against oak wilt fungus was isolated from the petiole compared to the other parts. This study could contribute to the development of biological control approaches for the management of oak wilt disease caused by R. quercus-mongolicae.

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Identification and characterization of Alternaria alternata causing leaf spot of olive tree ( Olea europaea ) in Turkey

Cited by 21 publications

References 28 publications

Bacterial disease induced changes in fungal communities of olive tree twigs depend on host genotype

Bacterial disease induced changes in fungal communities of olive tree twigs depend on host genotype

Fungal Communities Associated with Peacock and Cercospora Leaf Spots in Olive

Screening of Endophytic Fungal Isolates Against Raffaelea quercus-mongolicae Causing Oak Wilt Disease in Korea

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