Seminario izabel modificado  Izabel Cristina Alves Batista Data: 23/11/2021, às 16h, pelo ZOOM* Orientador: Eduardo Seiti Gomide Mizubuti

”New host compatibility” (NHC) is any event that contributes to the adaptation, resulting from a quick or lengthy process, of a microorganism to new hosts. Regardless of the pathosystem, an important consequence is the expansion of the host range, therefore it is a matter of concern not only in animal health but also in agriculture. To most people the term “new host compatibility” commonly evokes “acquisition of genes” or neofunctionalization in the gene-for-gene model of interaction, since our knowledge of pathogen adaptation to new hosts was greatly influenced by the evolution of virulence factors in response to major gene resistance. But NHC can make use of other processes such as horizontal gene transfer, recombination, pseudorecombination, hybridization, variation in ploidy, and alternative splicing as a multi-host fitness booster. These are the major topics of the seminar. Comparative genomic studies of different populations of pathogens have shed light on models for host compatibility and have provided new insights into certain emerging pathogens. Overall, in addition to the genetic mechanisms involved, there are complex molecular interactions between the plant and the microorganism that support host change. The multiplicity of factors challenges the application of evolutionary predictors of a potential host range. However, paradoxically, a better understanding of the genetic and mechanical basis for compatibility of new plant pathogens with hosts may reveal new targets for controlling diseases already known or for limiting the emergence of plant pathogens.

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