Fig. S1 The phenotypes and anthocyanin contents of Columbia-0 (Col-0) Arabidopsis seedlings grown on high nitrate and nitrogen-free medium. Fig. S2 The root phenotypes of 14-d-old Columbia-0 (Col-0), nlp7-1 mutant, and 35S::NLP7-myc (NLP7-OE) Arabidopsis seedlings grown on high nitrate medium. Fig. S3 The expression of JA biosynthesis and metabolism genes in Columbia-0 (Col-0), nlp7-1 mutant, and 35S::NLP7-myc (NLP7-OE) Arabidopsis seedlings upon high nitrate treatment. Fig.