Abstract

This experiment was carried out to determine correct applications of GA3 for the production of cut flowers of Zantedeschia albomaculata cv. Black Magic in highlands. Tubers were treated with GA3 in concentrations of 0, 100, and 200 mg·L-1. ABA contents in the tubers and roots were twice as high (20∼25 pmol/mL) in the control as in GA3-treated tubers and roots. ABA content in roots increased with increasing GA3 concentration. Growth of the calla was investigated according to the tuber hardness (3.3, 6.0 kg·cm-2), GA3 concentrations (0, 100, 200 mg·L-1), and GA3 treatment duration (24 h, 12 h, and 30 min before planting). Tubers with higher tuber hardness were strong against soft rot, regardless of the GA3 concentrations and treatment durations. Tubers with lower tuber hardness showed over 90% soft rot occurrence when treated with 200 mg·L-1 GA3 for 24 h before planting. However, soft rot did not occur when treatment with 200 mg·L-1 GA3 was used for 12 h before planting.

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