iTRAQ-based Comparative Proteomic Analysis Provides Insights Into Tobacco Callus Response to Carbon Nanoparticles
Abstract Background: Carbon nanomaterials (CNMs) have attracted a great deal of research interest for their potential application in plants. Some types of CNMs have exhibited the ability on regulating the growth of plants, which showed a promising future in agriculture. However, detailed mechanism of their application in plants is still not well characterized especially at the molecular level.Methods: The biomass variation of tobacco callus was investigated to exposure of carbon nanoparticles (CNPs). During the incubation period, proteomic profiling in tobacco callus was investigated by using the isobaric tags for relative and absolute quantitation labeling (iTRAQ) coupled with 2D-LC MS/MS. The function of differentially expressed proteins were achieved by using a gene ontology (GO) and Kyoto encyclopedia of genes and genomes (KEGG) analysis by InterproScan, and qRT-PCR was used to confirm the results of the proteomic data.Results: The results showed that the growth of tobacco callus was enhanced by CNPs, with the optimal concentration at 50 mg/L. The expression levels of 198 cellular proteins were significantly up- or down- regulated after CNPs treatment. These differentially expressed proteins were involved in mitochondria and calcium-mediated signaling. Conclusions: We demonstrated CNPs have the ability to enhance the growth of tobacco callus. The proteomic profile changes of tobacco callus provided a deeper understanding of the highly complex regulatory mechanisms in tobacco callus exposed to CNPs.