FIGURE 5.

Effects of Pi deficiency for 2 days on RSA under different growth conditions. MI48 seedlings (4-days-old) were grown under P+ and P- conditions for 2 days in a modified hydroponic system as shown in Figure 3C and in Petri plates lined with blotting paper. (A,C) Harvested roots were spread to reveal the details of RSA showing (a) lack and (b) exuberant growth of lateral roots on primary root of P+ and P- seedlings during growth on modified hydroponic system (A) and in Petri plates lined with blotting paper (C). Seminal roots (A,C) are indicated with blue dots at their tips. (B,D) Data presented for per cent seedlings showing lateral root development on primary root during growth on modified hydroponic system (B) and in Petri plates lined with blotting paper (D).