CsbHLH18 Directly Activates CsTSI to Promote Theanine Biosynthesis in Tea Plants (Camellia sinensis L.).
Transient overexpression and virus-induced gene silencing in tea plants demonstrated that CsbHLH18 positively regulates theanine biosynthesis by activating CsTSI transcription, elucidate a previously uncharacterized molecular mechanism underlying theanine biosynthesis and provide theoretical insights into molecular breeding and cultivation of high-quality tea varieties.