Characterization of Mitochondrial Proteomic Changes in Resistant Wheat Near-Isogenic Line After Inoculation with Powdery Mildew

Wheat powdery mildew resistance mechanisms have been studied extensively at genomic level, however, infection induced mitochondrial proteomic changes in resistant line have not been fully characterized. Being critical organelles of chemical energy metabolism, mitochondria have also been suggested to be involved in the environmental stress response. Using proteomic approaches, we did comparative analysis of mitochondrial proteome in resistant wheat near-isogenic line (NIL) (BrockxJing4117) and its recurrent parent Jing 411 after infection of Blumeria graminis f.sp. tritici (Bgt). More than 50 down-regulated mitochondrial protein spots were identified in NIL after 24-h pathogen inoculation, and their abundance recovered to the levels prior to infection after extended inoculation (72-h). We further analyzed a subgroup of down-regulated proteins using mass spectrometry. MS/MS data analysis revealed the identities of nine protein spots and assigned them into three functional classes: synthesis of protein, disease resistance response and energy metabolism. For the first time we demonstrated pathogen stress induced mitochondrial proteomic changes and provided evidences that wheat powdery mildew resistance involves multiple biochemical events. Moreover, our results indicate that wheat mitochondrial proteome analysis can serve as a powerful tool to identify potential regulators of fungal invasion resistance.