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        Changes in gene expression profiles as they relate to the adult plant leaf rust resistance in the wheat cv. Toropi

        Author
        Casassola, Alice
        Brammer, Sandra P.
        Chaves, Márcia S.
        Martinelli, José A.
        Stefanato, Francesca
        Boyd, Lesley
        Attention
        2299/17017
        Abstract
        Leaf rust, caused by the foliar pathogen Puccinia triticina is a major disease of wheat in the southern region of Brazil and invariably impacts on production, being responsible for high yield losses. The Brazilian wheat cultivar Toropi has proven, durable adult plant resistance (APR) to leaf rust, which uniquely shows a pre-haustorial resistance phenotype. In this study we aimed to understand the interaction between P.triticina and the pre-haustorial APR in Toropi by quantitatively evaluating the temporal transcription profiles of selected genes known to be related to infection and defense in wheat. The expression profiles of 15 selected genes varied over time, grouping into six expression profile groups. The expression profiles indicated the induction of classical defence pathways in response to pathogen development, but also the potential modification of Toropi's cellular status for the benefit of the pathogen. Classical defence genes, including peroxidases, β-1,3-glucanases and an endochitinase were expressed both early (pre-haustorial) and late (post-haustorial) over the 72h infection time course, while induction of transcription of other infection-related genes with a potential role in defence, although variable was maintained through-out. These genes directly or indirectly had a role in plant lignification, oxidative stress, the regulation of energy supply, water and lipid transport, and cell cycle regulation. The early induction of transcription of defence-related genes supports the pre-haustorial resistance phenotype in Toropi, providing a valuable source of genes controlling leaf rust resistance for wheat breeding.
        Publication date
        2015-01
        Published in
        Physiological and Molecular Plant Pathology
        Published version
        https://doi.org/10.1016/j.pmpp.2014.12.004
        Other links
        http://hdl.handle.net/2299/17017
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