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Medientyp:
E-Artikel
Titel:
Physiological Responses of Cut Rose Flowers to Exposure to Low Temperature: Changes in Membrane Permeability and Ethylene Production
Beteiligte:
FARAGHER, JOHN D.;
MAYAK, SHIMON
Erschienen:
Clarendon Press, 1984
Erschienen in:Journal of Experimental Botany
Sprache:
Englisch
ISSN:
0022-0957;
1460-2431
Entstehung:
Anmerkungen:
Beschreibung:
<p>Senescence of cut rose flowers (Rosa hybrida L. cv. Mercedes) at 22 °C occurred earlier in flowers previously held at 2 °C for 10 d or 17 d than in freshly cut flowers. This advanced senescence was observed as an earlier increase in both ethylene production rate and membrane permeability. The rise in ethylene production preceded the rise in the level of ion leakage from petals, and this in turn preceded visible symptoms of petal death. Applied ethylene stimulated ion leakage and inhibitors of ethylene synthesis and action (amino-oxyacetic acid and silver thiosulphate respectively) inhibited the normal increase in ion leakage. The maximum rate of ethylene production of 22 °C increased markedly in petals of flowers previously held at 2 °C, up to nine times the level in fresh flowers. We conclude that during exposure of rose flowers to 2 °C, in addition to senescence, processes were induced which led to stimulated ethylene production after transferral to 22 °C. Ethylene apparently caused the subsequent advance in membrane permeability and senescence.</p>