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Background   Pyropia yezoensis  is an important marine crop which, due to its high protein content, is widely used as a seafood in China. Unfortunately, red rot disease, caused by  Pythium porphyrae,  seriously damages  P. yezoensis  farms every year in China, Japan, and Korea. Proteomic methods are often used to study the interactions between hosts and pathogens. Therefore, an iTRAQ-based proteomic analysis was used to identify pathogen-responsive proteins following the artificial infection of  P. yezoensis  with  P. porphyrae  spores.    Results  A total of 762 differentially expressed proteins were identified, of which 378 were up-regulated and 384 were down-regulated following infection. A large amount of these proteins were involved in disease stress, carbohydrate metabolism, cell signaling, chaperone activity, photosynthesis, and energy metabolism, as annotated in the KEGG database. Overall, the data showed that  P. yezoensis  resists infection by inhibiting photosynthesis, and energy and carbohydrate metabolism pathways, as supported by changes in the expression levels of related proteins. The expression data are available via ProteomeXchange with the identifier PXD009363.    Conclusions  The current data provide an overall summary of the red algae responses to pathogen infection. This study improves our understanding of infection resistance in  P. yezoensis,  and may help in increasing the breeding of  P. porphyrae- infection tolerant macroalgae.    Electronic supplementary material  The online version of this article (10.1186/s12864-018-5229-1) contains supplementary material, which is available to authorized users.

Identification of proteins responding to pathogen-infection in the red alga Pyropia yezoensis using iTRAQ quantitative proteomics