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“Flavonoid accumulation was induced by exposing plants for 1 week to nitrogen depletion at 10 degrees C, giving high levels of anthocyanins and 3-glucoside-7-rhamnosides, 3,7-di-rhamnosides and 3-rutinoside-7-rhamnosides of kaempferol and quercetin.”
“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.”
“Kaempferols are the dominating flavonols in Arabidopsis leaves under normal cultivation conditions, but quercetin accumulation can be triggered by nitrogen depletion in combination with other abiotic factors.”