Regulated deficit irrigation strategies affect the terpene accumulation in Gewürztraminer (Vitis vinifera L.) grapes grown in the Okanagan Valley

•Regulated deficit irrigation can result in 30–50% water savings.•Regulated deficit irrigation affects terpene profile in Gewürztraminer grapes.•Late deficit irrigation does not affect vine yield and increases key terpenes.•Regulated deficit irrigation down-regulates terpene genes in Gewürztraminer grapes.