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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Eucalyptus Cuticular Waxes Contribute in Preformed Defense Against Austropuccinia psidii

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dos Santos, Isaneli Batista [1] ; Lopes, Mariana da Silva [1] ; Bini, Andressa Peres [1] ; Prohmann Tschoeke, Bruno Augusto [1] ; Wruck Verssani, Bruna Aparecida [2] ; Figueredo, Everthon Fernandes [1] ; Cataldi, Thais Regiani [1] ; Rodrigues Marques, Joao Paulo [3] ; Silva, Luciana Duque [4] ; Labate, Carlos Alberto [1] ; Quecine, Maria Carolina [1]
Total Authors: 11
[1] Univ Sao Paulo, Dept Genet, Luiz de Queiroz Coll Agr, Piracicaba - Brazil
[2] Univ Sao Paulo, Dept Exact Sci, Luiz de Queiroz Coll Agr, Piracicaba - Brazil
[3] Univ Sao Paulo, Dept Phytopathol, Luiz de Queiroz Coll Agr, Piracicaba - Brazil
[4] Univ Sao Paulo, Dept Forest Sci, Luiz de Queiroz Coll Agr, Piracicaba - Brazil
Total Affiliations: 4
Document type: Journal article
Web of Science Citations: 0

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-TOFMS 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. (AU)

FAPESP's process: 14/16804-4 - Deciphering the molecular interaction between Puccinia psidii x Eucalyptus grandis through "omics" approaches
Grantee:Maria Carolina Quecine Verdi
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 12/25315-1 - Histopathology of Sporisorium scitamineum and sugarcane interaction
Grantee:João Paulo Rodrigues Marques
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/11026-1 - Bacterial biosynthesis of indole acetic acid l-tryptophan dependent and influence on the modulation of vegetal growth
Grantee:Everthon Fernandes Figueredo
Support Opportunities: Scholarships in Brazil - Master