Figure 1.

Exogenous ATP induces root curling and growth of lateral roots. Shown are 1-week-old Arabidopsis plants (ecotype Wassilewskija) grown on a plate containing MS only (A), or MS +: 1 mm ATP (B), 2 mm ATP (C), 3 mm ATP (D), 2 mm ADP (E), 2 mm AMP (F), 2 mm ITP (G), and 2 mm ADP plus 2 mm phosphate, pH 4.1 (H). For these experiments, the pH of the ATP was not adjusted before adding it into the media.