Grafting with rootstocks promotes flavonoid accumulation in the sweet orange Newhall peels based on the metabolome and transcriptome analyses

In this study, scion-rootstock interactions were investigated at the expassion stage, the late stage of expassion, the fruit turning stage and the ripening stage when navel orange were hetero-grafted with two commonly used rootstock (P. trifoliata, C. junos Siebold ex Tanaka). Physiological investigations showed that hetero-grafts, especially P. trifoliata, contained higher concentrations of total flavonoid content in skin compared with the C. junos Siebold ex Tanaka grafted from sweet orange Newhall .