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. 2018 May 17;9:618. doi: 10.3389/fpls.2018.00618

FIGURE 4.

FIGURE 4

Auxin is involved in UV-B-induced root bending. (A,B) The angle of root bending of the wild-type Col-0 seedlings irradiated with UV-B for 1 h and then transferred to normal growth conditions plus 0 nM NAA or 10 nM NAA for 0–3 h, n = 60. (A) Each gravistimulated root was assigned to 1 of the 12 30° sectors on a gravitropism diagram. The length of each bar represents the mean percentage of seedlings assigned to the respective sector. (B) The average root bending angles. (C,D) The angle of root bending of Col-0 and yucca seedlings irradiated with UV-B for 1 h and then transferred to normal growth conditions for 0–3 h. Col-0, n = 60; yucca, n = 60. (C) Each gravistimulated root was assigned to 1 of the 12 30° sectors on a gravitropism diagram. The length of each bar represents the mean percentage of seedlings assigned to the respective sector. (D) The average root bending angles of Col-0 and yucca seedlings. The red and black arrows indicate the direction of UV-B radiation and gravity, respectively; ck, before UV-B radiation control. The error bars represent the ±SE, and different letters indicate significantly different values (P < 0.01 by Tukey’s test).