Abstract
Abstract Adventitious shoot induction and elongation was compared between root and petiole explants of Kentucky coffeetree (Gymnocladus dioicus L.) explants treated with a factorial combination of benzylaminopurine (BA) and thidiazuron (TDZ). Petiole explants initiated more adventitious shoots compared to root explants. Up to 83% of petiole explants initiated shoots compared to 67% of root explants. Maximal shoot induction was approximately 12 or five shoots per responding explant for petiole and root explants, respectively. For both explant types, TDZ was more effective than BA for shoot induction. There was an interaction between BA and TDZ on shoot induction in petiole explants, with the greatest percentage of explants forming shoots and the highest number of shoots initiated on the combination of 0.5 μM TDZ plus 10 μM BA and 1.0 μM TDZ plus 5 or 10 μM BA. In contrast, increasing concentrations of BA inhibited shoot initiation in root explants with and without TDZ. While BA inhibited shoot initiation i...
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