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Tomato yellow leaf curl virus (TYLCV) is a serious pathogen transmitted by the whitefly (Bemisia tabaci). Due to the quick spread of the virus, which is assisted by its vector, tomato yield and quality have suffered a crushing blow. Resistance to TYLCV has been intensively investigated in transmission, yet the mechanism of anti-TYLCV remains elusive. Herein, we conducted transcriptome profiling with a TYLCV-resistant cultivar (CLN2777A) and a susceptible line (Moneymaker) to identify the potential mechanism of resistance to TYLCV. Compared to the susceptible line, CLN2777A maintained a lower level of lipid peroxidation (LPO) after TYLCV infection. Through RNA-seq, over 1000 differentially expressed genes related to the metabolic process, cellular process, response to stimulus, biological regulation, and signaling were identified, indicating that the defense response was activated after the virus attack. Further analysis showed that TYLCV infection could induce the expression of the genes involved in salicylic and jasmonic acid biosynthesis and the signal transduction of phytohormones, which illustrated that phytohormones were essential for tomatoes to defend against TYLCV. These findings provide greater insight into the effective source of resistance for TYLCV control, indicating a potential molecular tool for the design of TYLCV-resistant tomatoes.

Transcriptome Profiling Unravels the Involvement of Phytohormones in Tomato Resistance to the Tomato Yellow Leaf Curl Virus (TYLCV)