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Journal of Experimental Botany, Vol. 51, No. 353, pp. 2067-2073, December 2000
© 2000 Oxford University Press

Original Papers

Role of the gynoecium in natural senescence of carnation (Dianthus caryophyllus L.) flowers

Kenichi Shibuya, Toshihito Yoshioka, Teruyoshi Hashiba and Shigeru Satoh1

Laboratory of Bioadaptation, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-amamiyamachi 1-1, Aoba-ku, Sendai 981-8555, Japan

Although the role of the gynoecium in natural senescence of the carnation flower has long been suggested, it has remained a matter of dispute because petal senescence in the cut carnation flower was not delayed by the removal of gynoecium. In this study, the gynoecium was snapped off by hand, in contrast to previous investigations where removal was achieved by forceps or scissors. The removal of the gynoecium by hand prevented the onset of ethylene production and prolonged the vase life of the flower, demonstrating a decisive role of the gynoecium in controlling natural senescence of the carnation flower. Abscisic acid (ABA) and indole-3-acetic acid (IAA), which induced ethylene production and accelerated petal senescence in carnation flowers, did not stimulate ethylene production in the flowers with gynoecia removed (–Gyn flowers). Application of 1-aminocyclopropane-1-carboxylate (ACC), the ethylene precursor, induced substantial ethylene production and petal wilting in the flowers with gynoecia left intact, but was less effective at stimulating ethylene production in the –Gyn flowers and negligible petal in-rolling was observed. Exogenous ethylene induced autocatalytic production of the gas and petal wilting in the –Gyn flowers. These results indicated that ethylene generated in the gynoecium triggers the onset of ethylene production in the petals of carnation during natural senescence.

Key words: Carnation, Dianthus caryophyllus, ethylene production, gynoecium, senescence.


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