Fungal diversity in oil palm leaves showing symptoms of Fatal Yellowing disease

Costa, Ohana Y.A.; Tupinambá, Daiva Domenech; Bergmann, Jessica Carvalho; Barreto, Cristine Chaves; Quirino, Betânia Ferraz

doi:10.1371/journal.pone.0191884

Cited by 22 publications

(15 citation statements)

References 34 publications

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“…Recently, de Assis Costa et al . 25 analysed the fungal diversity of asymptomatic and symptomatic leaf samples of the oil palm Elaeis guineensis . Here, the fungal community composition in asymptomatic leaves was more similar to each other compared to symptomatic leaves.…”

Section: Introductionmentioning

confidence: 99%

Deciphering bacterial and fungal endophyte communities in leaves of two maple trees with green islands

Wemheuer

Daniel

et al. 2019

Sci Rep

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Green islands (the re-greening of senescent leaf tissues) are particularly evident on leaves infected with fungal pathogens. To date, there is only a limited number of studies investigating foliar endophytic microorganisms in phytopathogen-infected leaves. Here, we analysed bacterial and fungal endophyte communities in leaves without green islands (control leaves; CL), within green island areas (GLA) and the surrounding yellow leaf areas (YLA) of leaves with green islands of Acer campestre and A. platanoides. GLA samples of A. campestre and A. platanoides were dominated by Sawadaea polyfida and S. bicornis, respectively, suggesting that these fungi might be responsible for the green islands. We detected a higher fungal richness and diversity in CL compared to GLA samples of A. campestre. Leaf status (CL, GLA, YLA) significantly altered the composition of fungal communities of A. campestre. This was related to differences in fungal community composition between YLA and GLA samples. Site was the main driver of bacterial communities, suggesting that bacterial and fungal endophytes are shaped by different factors. Overall, we observed Acer species-specific responses of endophyte communities towards the presence of green islands and/or leaf type, which might be attributed to several fungi and bacteria specifically associated with one Acer species.

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Section: Introductionmentioning

confidence: 99%

Deciphering bacterial and fungal endophyte communities in leaves of two maple trees with green islands

Wemheuer

Daniel

et al. 2019

Sci Rep

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“…However, a first report in Thailand revealed that a strain of Pestalotiopsis theae caused a leaf spot disease in oil palm which was further confirmed through pathogenicity test and molecular identification (Suwannarach et al 2013). In a more recent study, the finding of Pestalotiopsis, Neopestalotiopsis, and Pseudopestalotiopsis in oil palm trees cultivated in Brazil revealed that these fungi may cause some lesions to the oil palm leaves although not directly related to serious disease (de Assis Costa et al 2018).…”

Section: Resultsmentioning

confidence: 95%

Screening of endophytic fungi from oil palm (Elaeis guineensis) in producing exopolysaccharides

et al. 2021

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Abstract. Yurnaliza Y, Jamilah I, Hartanto A, Lutfia A. 2021. Screening of endophytic fungi from oil palm (Elaeis guineensis) in producing exopolysaccharides. Biodiversitas 22: 1467-1473. Exopolysaccharides (EPS) are microbial polysaccharides with a high biotechnological application in many fields due to their bioactivity and biocompatibility. Endophytic fungi are potential agents for producing EPS even though they remained under-exploited, especially those originating as indigenous strains from oil palm (Elaeis guineensis Jacq.). The present study reports on EPS production by a collection of endophytic fungi isolated from the petioles of oil palm under submerged fermentation. The culture medium was formulated with sucrose as C-source to trigger the secretion of EPS by the strains. Isolation of EPS was done through absolute ethanol precipitation in cold conditions. A total of 29 endophytic fungal strains was recovered from the foliar part of the plants. Molecular identification based on ITS-rDNA region and phylogenetic construction of each lineage revealed the dominant species from Pestalotiopsidaceae (syn. Amphisphaeriaceae), followed by Hypoxylaceae, Pleosporaceae, Didymosphaeriaceae, Sporocadaceae, and other minor families. In general, most isolates were ascomycetous fungi along with a basidiomycetous and zygomycetous fungus. After fermentation for 10 days, three fungal endophytes identified as Annulohypoxylon thailandicum P8 (Hypoxylaceae), Pseudopestalotiopsis simitheae P1 (Pestalotiopsidaceae), and Diaporthe eucalyptorum P11 (Diaporthaceae) secreted EPS higher in values than the others. The most prominent strain was A. thailandicum P8 with a yield of >50 mg/100 mL of filtrate solution. Based on FT-IR spectral analysis, the EPS product was detected to contain carboxyl, carbonyl, glycosidic bonds, and hydroxyl groups hereafter confirmed the characteristics of exopolysaccharides. The results demonstrated that the EPS may be evaluated for its bioactivity in a future study.

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“…Some studies also looked for possible abiotic causes, with inconclusive results so far [17][18][19]. Recently, techniques such as metabolomics, proteomics, and metagenomics started to be applied to provide insights into the possible FY etiology, initiating a new phase in the process to solve this problem [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Oil Palm Fatal Yellowing (FY), a Disease with an Elusive Causal Agent

Bittencourt¹,

Lins²,

Boari³

et al. 2022

Elaeis Guineensis

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Fatal yellowing disease (FY) is a bud rot-type disease that severely affects oil palm plantations in Latin America. Since 1974, when it was first reported in Brazil, this disorder has been responsible for severe economic losses in the oil palm industry; and, for nearly 50 years, several studies have tried to identify its causal agent, without success. The etiological studies regarding FY in oil palm explored either biotic and abiotic stress scenarios, in a single or combined manner. Most recently, the hypothesis in favor of one biotic cause has lost some grounds to the abiotic one, mainly due to new insights regarding deficient aeration in the soil, which reduces the potential for oxy-reduction, causing changes in the ionic composition of the soil solution. This review presents an overview of the history of this disease and the several efforts done to fulfill Koch’s postulates over the last 40 years, besides discussing recent studies that revisited this subject using some omics technics. We conclude by discussing further uses of omics via a multi-omics integration (MOI) strategy to help finally find out what is really behind the genesis of FY. Finding this elusive causal agent of FY out will allow either the development of a more efficient diagnostic tool and the advance in studies trying to find out the source of the genetic resistance hidden in the genome of the American oil palm.

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Fungal diversity in oil palm leaves showing symptoms of Fatal Yellowing disease

Cited by 22 publications

References 34 publications

Deciphering bacterial and fungal endophyte communities in leaves of two maple trees with green islands

Deciphering bacterial and fungal endophyte communities in leaves of two maple trees with green islands

Screening of endophytic fungi from oil palm (Elaeis guineensis) in producing exopolysaccharides

Oil Palm Fatal Yellowing (FY), a Disease with an Elusive Causal Agent

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