Integration of Metabolome and Transcriptome Studies Reveals Flavonoids, Abscisic Acid, and Nitric Oxide Comodulating the Freezing Tolerance in .

is an evergreen perennial ornamental groundcover with a strong freezing tolerance. However, the molecular mechanism underlying the freezing tolerance in remains unclear. In this study, a comprehensive investigation of freezing tolerance was conducted at the levels of physiology and biochemistry, metabolite, and transcript during the stress treatment.