Differential gene expression in incompatible interaction between turnip mosaic virus and non-heading Chinese cabbage

Abstract

Viral disease, caused by turnip mosaic virus (TuMV), is considered the most destructive disease of non-heading Chinese cabbage (Brassica campestris ssp. chinensis Makino). Although several TuMV resistance loci/genes have been mapped or characterized in Brassica vegetables, the mechanism of molecular interaction between TuMV and non-heading Chinese cabbage is poorly understood. Additionally, TuMV response genes need to be identified. The objectives of this study were to identify differentially expressed genes during the incompatible interaction between TuMV and non-heading Chinese cabbage, and validate their expressions. A total of 200 transcript-derived fragments (TDFs) obtained by complementary DNA-amplified fragment length polymorphism were recovered and sequenced. The results revealed that 176 (88.0%) TDFs produced specific sequences, among which 48 (27.3%) sequences were predicted with putative functions using NCBI BLAST. Among the 48 available TDFs, 22 (45.8%) sequences belonging to different functional groups were selected to monitor the changes in their expression in incompatible and compatible interactions by quantitative real-time polymerase chain reaction. To the best of our knowledge, this study provides the first global transcriptomic analysis of non-heading Chinese cabbage genes during an incompatible interaction. The results are expected to aid in characterizing TuMV response genes and clarifying the molecular mechanism of TuMV–host interaction.