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The bHLH transcription factors EGL3 (ENHANCER OF GLABRA3) and its close homologue GL3 (GLABRA3) are important regulators of the anthocyanin pathway in Arabidopsis thaliana, and together with TTG1 (a WD40 repeat protein) and MYB transcription factors regulate specific genes in the pathway. In response to nitrogen depletion, the MYB genes PAP1/PAP2 (production of anthocyanin pigment 1/2) and GL3 are...
Expression of regulators of the flavonoid pathway was examined in Arabidopsisthaliana wild type and pap1D plants, the latter being a T-DNA activation-tagged line over-expressing the PAP1/MYB75 gene which is a positive regulator of the pathway. Anthocyanin accumulation was induced in plants grown in soil, on agar plates, and hydroponics by withdrawing nitrogen from the growth medium. The agar-grown...
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