Figure 3.

The root system phenotypes displayed by 15-day old Arabidopsis plant lines Col-0, drb1, drb2 and drb4 post exposure to a 7-day period of PO₄ starvation. (A) The root system phenotypes expressed by non-stressed (top row of panels) and PO₄-stressed (bottom row of panels) 15-day old Col-0, drb1, drb2 and drb4 plants. Scale bar = 1cm. (B) Quantification of the root mass of 8-day old Col-0, drb1, drb2 and drb4 seedlings cultivated under standard growth conditions. (C) The root mass of non-stressed and PO₄-stressed 15-day old Col-0, drb1, drb2 and drb4 plants. (D) The primary root length of non-stressed and PO₄-stressed 15-day old Arabidopsis lines, Col-0, drb1, drb2 and drb4. (E) The number of lateral roots formed from the primary root of 15-day old Col-0, drb1, drb2 and drb4 plants cultivated under standard growth conditions, or post the 7-day PO₄ starvation period. (B–E) Error bars represent the standard deviation of four biological replicates and each biological replicate consisted of a pool of twelve individual plants. The presence of an asterisk above a column represents a statistically significant difference either between non-stressed Col-0 plants and each assessed drb mutant post cultivation under either a non-stressed or stressed growth regime (B) or between the non-stressed and PO₄-stressed sample of each plant line (C-E) (p-value: * < 0.05; ** < 0.005; *** < 0.001).