Avaliação da resistência de espécies de eucalipto à ferrugem (Puccinia psidii Winter)

Silva, Diene Elen Miranda da; Azevedo, Luís Antônio Siqueira de; Poltronieri, Tathianne Pastana de Souza

doi:10.1590/s0100-54052014000100008

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…The susceptibility and resistance levels found in Eucalyptus grandis , Eucalyptus cloeziana , Eucalyptus microcorys , Eucalyptus robusta , Eucalyptus tereticornis , Eucalyptus urograndis , Eucalyptus saligna and Eucalyptus urophylla have been reported previously (Carvalho et al, 1998; Zauza et al, 2010; Carnegie and Lidbetter, 2012; Silva et al, 2014). However, we observed low resistance in Eucalyptus cloeziana , Eucalyptus dunii and Eucalyptus microcorys that had been previously described as species susceptible to A. psidii (Dianese et al, 1984; Kawanishi et al, 2009; Zauza et al, 2010; Carnegie and Lidbetter, 2012; Silva et al, 2014). Our research is the first report that describes the susceptibility of Eucalyptus botryoides and Eucalyptus deglupta to rust, as well as the resistance of Eucalyptus brassiana , Eucalyptus exserta and Eucalyptus toreliodora to the disease.…”

Section: Discussionsupporting

confidence: 77%

The Eucalyptus Cuticular Waxes Contribute in Preformed Defense Against Austropuccinia psidii

et al. 2019

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Austropuccinia psidii, the causal agent of myrtle rust, is a biotrophic pathogen whose growth and development depends on the host tissues. The uredospores of A. psidii infect Eucalyptus by engaging in close contact with the host surface and interacting with the leaf cuticle that provides important chemical and physical signals to trigger the infection process. In this study, the cuticular waxes of Eucalyptus spp. were analyzed to determine their composition or structure and correlation with susceptibility/resistance to A. psidii. Twenty-one Eucalyptus spp. in the field were classified as resistant or susceptible. The resistance/susceptibility level of six Eucalyptus spp. were validated in controlled conditions using qPCR, revealing that the pathogen can germinate on the eucalyptus surface of some species without multiplying in the host. CG-TOF-MS analysis detected 26 compounds in the Eucalyptus spp. cuticle and led to the discovery of the role of hexadecanoic acid in the susceptibility of Eucalyptus grandis and Eucalyptus phaeotricha to A. psidii. We characterized the epicuticular wax morphology of the six previously selected Eucalyptus spp. using scanning electron microscopy and observed different behavior in A. psidii germination during host infection. It was found a correlation of epicuticular morphology on the resistance to A. psidii. However, in this study, we provide the first report of considerable interspecific variation in Eucalyptus spp. on the susceptibility to A. psidii and its correlation with cuticular waxes chemical compounds that seem to play a synergistic role as a preformed defense mechanism.

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Section: Discussionsupporting

confidence: 77%

The Eucalyptus Cuticular Waxes Contribute in Preformed Defense Against Austropuccinia psidii

et al. 2019

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“…Previous studies, primarily focussed on Eucalyptus spp. (E. citriodora, E. saligna, E. grandis and E. robusta, among others) as well as Corymbia spp., have studied and identified A. psidii resistance/ susceptibility patterns within host populations (Pegg et al 2014b;Silva et al 2014). Thumma et al (2013) when studying resistance to myrtle rust in E. nitens, E. globulus and E. grandis concluded that resistance is quantitative and likely to be controlled by variation in many genes.…”

Section: Discussionmentioning

confidence: 99%

Impacts of the invasive fungus Austropuccinia psidii (myrtle rust) on three Australian Myrtaceae species of coastal swamp woodland

et al. 2017

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Exotic fungal pathogens can substantially affect individuals and populations of susceptible native plant species, potentially resulting in changes in community structure and composition. Austropuccinia psidii (myrtle rust) is a pathogenic fungus native to South America that affects species in the plant family Myrtaceae. The pathogen was introduced accidentally to Australia and first detected in NSW in April 2010. Ecological impacts have been poorly studied in the native range of A. psidii and even less in its Australian introduced range. In order to assess the potential impact of A. psidii on coastal swamp woodland, two glasshouse experiments were conducted using three co-occurring species: Melaleuca quinquenervia, Leptospermum laevigatum and Baeckea linifolia. Plants of each species were grown individually (Experiment 1) and in mixed species assemblages (Experiment 2), with half inoculated with A. psidii and the other half remaining as controls. Infection level was assessed and impact on seedling survival and growth recorded. In both experiments L. laevigatum and M. quinquenervia seedlings were heavily infected and showed high degrees of susceptibility with negative effects on growth (height, biomass and number of leaves). In contrast, no B. linifolia seedling presented visible symptoms of disease, although seedlings showed reduced growth. Melaleuca quinquenervia seedlings had greater infection levels and suffered greater growth reductions than L. laevigatum in both experiments. However, there was no significant difference in the relative abundance of the three species in the mixed-species experiment. This study provides a better understanding of the potential impacts of A. psidii in this vegetation community and has significant implications for the conservation and management of Australian Myrtaceae-dominated plant communities generally.

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“…Thus, it was considered the clone least susceptible to powdery mildew disease compared to the others as evaluated in this study. Silva et al (2014), in a study evaluating the partial resistance of eucalyptus rust (Puccinia psidii) in different species of Eucalyptus, observed that Eucalyptus urograndis (E. grandis x E. urophylla) presented a low average number of pustules per leaflet, low severity, long average latent period and low values of area below the disease progression curve, thus having a higher partial resistance to rust. This demonstrates that a eucalyptus hybrid may present a greater resistance and low incidence to fungal diseases.…”

Section: /9mentioning

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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Avaliação da resistência de espécies de eucalipto à ferrugem (Puccinia psidii Winter)

Cited by 7 publications

References 6 publications

The Eucalyptus Cuticular Waxes Contribute in Preformed Defense Against Austropuccinia psidii

The Eucalyptus Cuticular Waxes Contribute in Preformed Defense Against Austropuccinia psidii

Impacts of the invasive fungus Austropuccinia psidii (myrtle rust) on three Australian Myrtaceae species of coastal swamp woodland

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

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