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Identification of genetic pathogenicity mechanisms of Austropuccinia psidii to the Myrtaceae family

Grant number: 21/01606-6
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): September 01, 2021
Effective date (End): August 31, 2023
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal researcher:Nelson Sidnei Massola Júnior
Grantee:Thaís Regina Boufleur
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated research grant:19/13191-5 - Epidemiological components, damage characterization and control of tropical and temperate rusts at a global climate change scenario, AP.TEM


Since the beggining of time, rust fungi have been among the pathogens responsible for some ofthe most destructive diseases in cultivated and non-cultivated plants worldwide. Among thesediseases is myrtle rust, caused by Austropuccinia psidii, that is becoming a growing threat to thisplant family. Brazil is the center of origin of A. psidii, and currently myrtle rust is widespread,associated with more than 480 species of this Family. The wide range of myrtle susceptible hosts,alied to genetic evidences, indicates that this pathogen is being disseminated worldwide throughthis multiple hosts, and is becoming a major problem to fruit production and the biodiversity ofmany countries. This disease represents the greatest threat to guava (Psidium guajava), and canlead to up to 100% of losses of production. Comparative genomic analyses between rust pathogensthat are able or not to infect plants of the myrtle family, will help to identify pathogenicity factorsrelated to the specificity of A. psidii to this family. The list of genes and/or genomic regions thatwill be revealed may be strong candidates in future studies of characterization of A. psidiipopulations, helping to clarify the complex taxonomy of the species. These genes can also be usedin functional studies, and may be helpfull in the development of more ecofriendly control measuresthat can reduce the threat of A. psidii to the economy and biodiversity. (AU)

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