Abstract
Rust caused by Puccinia psidii is one the most destructive diseases of Eucalyptus. Management of the disease is achieved through selection of resistant host genotypes. Recently, eucalypt plants from clone BA6021, resistant to P. psidii isolate race-1, were infected by rust in Brazil. Microsatellite profiles of infected plants confirmed that the host was indeed clone BA6021. In pathogenicity tests, the resistant clones BA6021 and G21 (which carry the resistance gene Ppr-1) were found susceptible to the newly discovered isolate EUBA-1, indicating a new biotype of the pathogen. These results show that the isolate EUBA-1 and other potentially unrecognized pathogen races should be given strong consideration for eucalypt breeding programs aimed rust resistance.
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Acknowledgments
We are grateful to Dr. Ned B. Klopfenstein for review of this manuscript. We thank the Cenibra S/A, Suzano Papel, and Veracel S/A for providing the eucalypt clones used in this study. This work was supported by CNPq (National Counsel of Technological and Scientific Development) and FAPEMIG (Fundação de Amparo a Pesquisa do Estado de Minas Gerais).
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Graça, R.N., Aun, C.P., Guimarães, L.M.S. et al. A new race of Puccinia psidii defeats rust resistance in eucalypt. Australasian Plant Pathol. 40, 442–447 (2011). https://doi.org/10.1007/s13313-011-0056-8
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DOI: https://doi.org/10.1007/s13313-011-0056-8