Fig. 4

Root phenotype analysis upon imazapyr acid stress. (A) Root length. (B) Root surface area. (C) Root volume. (D) Root average diameter. (E) Number of root tips. (F) Number of root forks. The water spray treatment was used as the control group. Different lowercase letters mean the significant difference across the time, and uppercase letters mean the significant difference between control and imazapyr acid treatments at the same time