Vol. 71 No: 4

Title:
Critical Ethylene Exposure for Capsicum Annuum ‘Janne’ is Dependent on an Interaction Between Concentration, Duration and Developmental Stage

Author:
L. HØYER

pp: 621-628

Abstract:
Two ethylene experiments were designed to show the reaction of the pot plant Capsicum annuum ‘Janne’ to ethylene and to define the critical level of ethylene exposure. The ethylene exposure consisted of 72 h of darkness at 19°C, an ethylene duration of 6–72 h and ethylene concentrations of 0.05–5.0 µl l^-1. After the plants had been exposed to ethylene they were placed in a post-production evaluation room. The response of capsicum to ethylene, as expressed by leaf and fruit abscission, was dependent on developmental stage, duration of ethylene exposure and ethylene concentration. Leaves were the most ethylene-sensitive plant parts, followed by the green and maroon fruits. Ethylene did not affect the rate of development into red fruits. The most developed plants were less sensitive to ethylene. Capsicum is very sensitive to ethylene, e.g. there was significant abscission of leaves after exposure to an ethylene concentration of 1.0 µl l^-1 for 12 h and a significant abscission of leaves and green fruit after exposure to 0.05 µl l^-1 for 72 h. A critical ethylene exposure is suggested, dependent on plant sensitivity, duration of ethylene exposure and ethylene concentration.

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