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The siz1 mutants exhibited exaggerated prototypical Pi starvation responses, including cessation of primary root elongation and extensive lateral root development (B), although no obvious difference between wild-type and siz1 seedlings under Pi sufficient condition (A). Treatment with brefeldin A (BFA) suppressed lateral root formation in low Pi (D) of wild-type and siz1 seedlings, compared to that in high Pi condition (C). Bars indicate 1 cm length.
