Figure 3.

Root System Architecture of Wild-Type, mdr1, and mdr4 Seedlings.

(A) The short lateral roots present in both alleles of mdr1 were completely rescued by ProMDR1:GFP-MDR1. Ws, Wassilewskija. Bar = 1 cm.

(B) No effect of mdr4 mutations on root system architecture. Seedlings were grown on half-strength Murashige and Skoog (MS) plates for 6 d and then transferred to a new plate to continue growth for 4 d. Roots were arranged before photographs were taken. Bar = 1 cm.

(C) Impaired lateral root growth rate in mdr1 seedlings is restored by ProMDR1:GFP-MDR1.

(D) Growth rate of lateral roots was not affected by mdr4 mutations. Data represent the average growth rates of 15 plants per genotype ± se. Growth rates statistically different (Student's t test, P > 0.05) from the wild type are indicated by asterisks.