Fig. 9.

Root tips of Arabidopsis wild type and of various hormone-related mutants grown in nutrient-sufficient media (control) or in the absence of Pi or Fe. A, Col-0 control; B, Col-0 –Fe; C, Col-0 –Pi; D, axr1 control; E, axr1 –Fe; F, axr1 –Pi; G, axr2 control; H, axr2 –Fe; I, axr2 –Pi; J, ein2 control; K, ein2 –Fe; L, ein2 –Pi; M, etr1 control, N, etr1 –Fe; O, etr1 –Pi; P, eto3 control; Q, eto3 –Fe; R, eto3 –Pi. Bar = 0.25 mm. Reprinted from Schmidt and Schikora (2001), with permission by the American Society of Plant Biologists.