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Flavonoids move from shoots to roots. Top, Although the expression of flavonoid pathway enzymes is light dependent, wild-type Arabidopsis roots grown in the dark fluoresce from flavonoid accumulation when the shoots are light grown, whereas tt4 root tips are flavonoid free. Bottom, The addition of N to cotyledons for 24 h leads to flavonoid fluorescence in tt4 root tips and enhances it in wild-type root tips. Scale bar = 100 μm.
