Occurrence of powdery mildew caused by <i>Podosphaera pannosa</i> on lemon eucalyptus

Cho, S. E.; Park, J. H.; Lee, S. H.; Lee, C. K.; Shin, Hyeon Dong

doi:10.1111/efp.12277

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…These results confirm the hypothesis raised by Silva et al (2001), who previously suggested that the eucalypt powdery mildew pathogen in Brazil was similar to the rose powdery mildew pathogen, P. pannosa, on the basis of morphological analyses of the anamorph and cross-inoculation studies. The results generated in this study also corroborate the results of Cho et al (2016), who reported P. pannosa as the causal agent of powdery mildew on Corymbia citriodora in Korea. This is a significant finding because it now confirms P. pannosa as the causal agent of a very important disease on eucalypt in Brazil.…”

Section: Discussionsupporting

confidence: 91%

“…Lév.] in Italy, United Kingdom, Denmark, Poland, Portugal, Argentina, New Zealand, Australia, South Africa, and Korea (Grasso 1948;Glasscock and Rosser 1958;Spaulding 1961;Gibson 1975;Boesewinkel 1981;Crous et al 1989;Cunnington et al 2003;Delhey et al 2003;Cho et al 2016). Powdery mildew has also been reported on field-grown Corymbia citriodora in Brazil, with leaf deformation and loss of apical dominance observed in young plants (Ferreira 1997).…”

Section: Introductionmentioning

confidence: 99%

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Eucalypt powdery mildew caused by Podosphaera pannosa in Brazil

Fonseca

Guimarães

Pires

et al. 2017

Trop. plant pathol.

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Eucalypt powdery mildew is an important disease in greenhouses and clonal hedges of Eucalyptus spp. in Brazil, which can cause leaf and shoot distortion, shoot discoloration, and growth reduction that results in production losses. Because reliable information regarding the causal agent of the disease is lacking, this study used ITS and 28S rDNA sequencing and morphological analyses to identify the powdery mildew pathogen that occurrs in eucalypt nurseries within different regions in Brazil. Based on the results of morphological characteristics and phylogenetic analyses, the pathogen isolates were identified as Podosphaera pannosa, also known as the rose powdery mildew pathogen. Cross inoculations with pathogen isolates from rose and eucalypt demonstrated that P. pannosa can infect both host species. The ITS sequence-based phylogeny showed that 42 sequences generated in this study were comprised within a single clade containing P. pannosa, which was supported by a posterior probability of 88%. Identical ITS sequences were obtained from all 42 pathogen isolates, which suggests a clonal population. Keywords Eucalyptus. Rosa. Bayesian analysis. Cross inoculation. Erysiphales. ITS rDNA. 28S rDNA * Acelino C.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Eucalypt powdery mildew caused by Podosphaera pannosa in Brazil

Fonseca

Guimarães

Pires

et al. 2017

Trop. plant pathol.

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“…(Ferreira, 1989). In 2014, in Korea, the first occurrence of powdery mildew caused by Podosphaera pannosa was identified in Corymbia citriodora (Cho et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Susceptibility of Clonal Seedlings of Eucalyptus spp. to Powdery Mildew Disease

et al. 2018

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Powdery mildew is one of the main diseases in eucalyptus clonal nursery. The present work aimed to confirm the identity of the causal agent of powdery mildew in clonal seedlings of Eucalyptus spp., and to evaluate the susceptibility reaction of clones to this disease. Conidia were collected in minigardens for molecular identification of the pathogen. We assessed susceptibility by testing 4 clones: Clone 1 (Eucalyptus benthamii), Clone 2 (E. dunni), Clone 3 (E. benthamii) and Clone 4 (E. urophylla x E. globulus). Scale of classes was used for calculations of Disease Index (DI) and Final Incidence (I). Temporal analysis was performed using the Logistic and Gompertz models. The molecular identification confirmed the identity of the isolates approximate to Podosphaera pannosa (teleomorphic phase of Oidium eucalypti). The Gompertz model obtained a better adjustment to the severity and incidence data, and clones 1 and 2 showed greater susceptibility to eucalyptus powdery mildew.

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“…Podosphaera pannosa is a pathogen with a broad host range, (Braun & Cook, 2012) and Corymbia citriodora (Myrtaceae) (Cho, Park, Lee, Lee, & Shin, 2016). On eucalypt, P. pannosa has been reported in several countries including Argentina, Brazil, Australia, Denmark, Italy, New Zealand, Poland, Portugal, United Kingdom, South Africa and recently South Korea (Cho et al, 2016;Old, Wingfield, & Qing Yuan, 2003).…”

Section: Introductionmentioning

confidence: 99%

Transcriptome analysis of a powdery mildew pathogen (Podosphaera pannosa) infecting Eucalyptus urophylla: De novo assembly, expression profiling and secretome prediction

et al. 2019

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Podosphaera pannosa is the causal agent of powdery mildew on eucalypt in Brazil.This powdery mildew disease is important in nurseries causing leaf and shoot distortion, shoot discoloration and reduction in growth, which decreases mini-cutting production. Improved RNA sequencing (RNA-Seq) technologies have allowed increased information about the transcriptome of several pathogens and hosts, enabling a better understanding of their interaction at the gene level. For this study, we analysed the transcriptome of P. pannosa during leaf infection of Eucalyptus urophylla leaves using RNA-Seq and de novo transcriptome assembly. The transcriptome was Illumina sequenced and assembled de novo, generating over 178 million RNA-Seq reads assembled onto 200,473 contigs. After filtering steps, the resulting 12,106 (6%) transcripts were identified as the P. pannosa transcriptome data set. The 10 most abundant transcripts included genes encoding enzymes likely involved in fungal establishment and growth, such as dihydrofolate reductase, putative methyltransferases, acyl-desaturase, glycoside hydrolase and dehydrogenases. In addition, genes putatively encoding an aquaporin and an orthologue to the effector protein, GoEC2of Golovinomyces orontii were identified. The predicted secretome consisted of 1,899 translated transcripts, of which 310 exhibited homology to proteins described in the PHI database, 144 of these showing homology to fungal PHI accessions that affected pathogenicity or that are described as effectors. In addition, 81 transcripts encoded secreted proteins homologous to effectors described in the Erysiphales. These results provide a basis for continued studies to better understand the P. pannosa-eucalypt (Eucalyptus spp.) pathosystem and could parallel studies of the eucalypt transcriptome to help determine host resistance mechanisms. K E Y W O R D Sbiotroph, leaf disease, microsatellites, secreted proteins

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Occurrence of powdery mildew caused by Podosphaera pannosa on lemon eucalyptus

Cited by 7 publications

References 4 publications

Eucalypt powdery mildew caused by Podosphaera pannosa in Brazil

Eucalypt powdery mildew caused by Podosphaera pannosa in Brazil

Susceptibility of Clonal Seedlings of Eucalyptus spp. to Powdery Mildew Disease

Transcriptome analysis of a powdery mildew pathogen (Podosphaera pannosa) infecting Eucalyptus urophylla: De novo assembly, expression profiling and secretome prediction

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