Abstract
Summary Longevity of carnation (Dianthus caryophyllus) cultivar Chinera was much longer than that of cultivar White Sim. In ‹Chinera›, the increases in 1-aminocyclopropane-1-carboxylic acid synthase (EC 4.4.1.14) activity, ethylene-forming enzyme activity, ethylene production and membrane permeability, associated with the start of the senescence process, occurred later, and the maximum levels during senescence were much lower than in ‹White Sim›. Ethylene treatment stimulated the activity of the ethylene biosynthetic pathway and associateted enzymes but stimulation was less in ‹Chinera› than in ‹White Sim›. Ethylene dose-response experiments showed lower sensitivity m ‹Chinera› while binding site characteristics were supposedly similar in the two cultivars. The reduced sensitivity of ‹Chinera› to ethylene, therefore, is apparently determined at a point beyond the receptor, presumably m the signal transduction chain. In cultivar Epomeo which is the progeny of ‹Chinera› and a non-commercial breeding line «9775», ethylene production and sensitivity showed the same trends as in ‹Chinera›, showing that the decreased sensitivity and the associate longer vase life is an inheritable feature.
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