Accumulation of (32)P and [ (14)C]sucrose in decapitated and intact shoots of the fern Davallia trichomanoides blume.

The transport and accumulation of (32)P and [(14)C] sucrose in decapitated and intact shoot segments of the fern Davallia were studied. The apical buds of intact shoots and the expanding buds of shoots decapitated 4 weeks before application are major sinks for these nutrients. Decapitation results in a shift of (14)C accumulation from the apex to the lateral buds within 36 h. This shift can be reversed in shoots decapitated for 12 h by replacing the apex. Increased (14)C accumulation into the stump region occurs when decapitated shoot segments are treated with indole-3-acetic acid, and decreased label accumulation into the apical region results when intact shoots are treated with 2,3,5-triiodobenzoic acid.