ISHS Acta Horticulturae 109: III International Symposium on Flower Bulbs
RESPONSE VARIATION OF TULIP CULTIVARS TO EXOGENOUS ETHYLENE |
| Authors: | A.A. De Hertogh, D.R. Dilley, N. Blakely |
| Abstract:
The sensitivity of 27 tulip cultivars to exogenous ethylene (10–12 ppm) and non-ventilated conditions was evaluated over 2 forcing seasons, 1976/77 and 1977/78. Pre- and post-treated bulb samples showed that ethylene consistently retarded growth of the shoots. Tepal growth was retarded more than the stamens and this resulted in a higher tepal/stamen ratio compared to the air controls. The effects of non-ventilated storage conditions were variable. Ethylene induced internal gummosis in 4 cultivars and external gummosis in 5 cultivars. At flowering, induced floral abortions of >20% was observed with 8 cultivars and 5–20% abortions were observed with 9 cultivars. Ten cultivars were apparently resistant to ethylene as far as floral abortions were concerned. Albury, Most Miles, and Orient Express were highly sensitive to non-ventilated conditions, while Golden Melody exhibited moderate sensitivity. | |
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