ISHS Acta Horticulturae 405: VI International Symposium on Postharvest Physiology of Ornamental Plants
INTERACTION BETWEEN EXPOSURE TIME, TEMPERATURE, AND ETHYLENE CONCENTRATION ON ETHYLENE INDUCED LEAFLET ABSCISSION |
| Author: | L. Høyer |
| Abstract:
The main factors which influence plant response to external ethylene are exposure time, temperature and ethylene concentration. To understand the responses to ethylene, it is necessary to consider the combined effect of these factors rather than the effect of the individual factors on the plant. Leaf abscission in Radermachera sinica following ethylene exposure is well described. For this investigation, plants were exposed to ethylene for 0 to 72 hours, at concentrations of 0.1; 1.0 and 10.0 μl l-1 at 10, 15, 20, 25 and 30°C. Also, a comparison was made of two different plant materials and two exposure systems. The plant material was either 8 to 10 week old plants of Radermachera sinica or fully developed leaves used as cuttings and continuous or interrupted ethylene exposure. The intact plant system and continuous ethylene exposure provided the best description of the ethylene response. The response of Radermachera sinica to an ethylene concentration of 1.0 μl l-1 took twice as long at 20°C compared to 25 and 30°C. There was no response to ethylene at 10°C. In addition, at 20°C, the response took twice as long when exposed to 0.1 compared to 10 μl-1 ethylene. | |
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