Luciferase activity was assayed as previously described (24). Briefly, 1 ml of 5 mM potassium luciferin (Gold Biotechnology) dissolved in water was directly applied to pDR5::LUC seedlings grown vertically on half-strength MS plates. The luciferin solution was allowed to dry for 5 to 10 min in the dark at room temperature. Seedlings were then imaged using a Lumizone CA automated Chemiluminescence system. Seven-minute exposure times were used.

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