Figure 1.

Time course of proteoid root development for –Pi plants supplemented with 1 µm Pi. A, Each developmental stage is labeled according to the number of days following rootlet emergence observed at day 1 until senescence at day 20. Scale bar = 1 cm. B and C, Rootlets from immature stage I (B) and mature stage III (C) proteoid roots were stained for lignified tissues, cleared, and imaged as described in “Materials and Methods.” Scale bar = 0.35 mm.