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This experiment was carried out to investigate the effect of high temperature (29±1℃) storage and ethylene (C₂H₄) on breaking domancy of freesia corms. Without C2H4 treatment; the longer the period of high-temperature stooge was, the better the growth before planting of corms such as leaf length, and the number of roots and sprouts became. And the growth before planting of corms treated with C₂H₄ after storage for ≥ 15 days at high temperature was fairly similar with that of corms stored for 60 days at high temperature without C₂H₄ treatment. Therefore, the period of high-temperature storage for breaking dormancy was shortened for 45 days by C₂H₄ treatment with high-temperature as compared by only high-temperature treatment. After planting of corms treated with C₂H₄ after storage for ≥ 15 days at high temperature, days to sprouting and the sprouting rate were 18 days and 95.7%, respectively. It was the same effect that of only high-temperature treated corms for 60 days. Cut-flower yield of corms untreated with C₂H₄ increased as the high-temperature storage period was extended. Cut-flower yield of the corms stored for 60 days at only high-temperature was 13,050 bundles/10a, while that of corms treated with C₂H₄ after storage for, ≥ 15 days at high temperature was 13,320 bundles/10a. Consequently, C₂H₄ treatment was effective to obtain dormancy release in freesia corms. The most effective time for the C₂H₄ treatment appeared to be after the 15 days storage at high temperature.
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