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“Previous reports show that low nitrogen availability strongly enhances anthocyanin accumulation in non carbon-limited plant organs or cell suspensions.”
“In response to nitrogen depletion , the MYB genes PAP1/PAP2 (production of anthocyanin pigment 1/2) and GL3 are strongly induced, and anthocyanin synthesis is activated in seedlings and rosette stage plants.”
“The flavonoids, kaempferols, quercetins and anthocyanins , showed significantly increased levels as a result of nitrogen depletion (two-, five- and six-fold increases, respectively) when averaged across all temperatures.”