ISHS Acta Horticulturae 298: Hortifroid, V International Symposium on Postharvest Physiology of Ornamental Plants; Importance of Cold in Ornamental Horticulture
DEFINITION OF INDICATORS OF SENESCENCE IN THE ROSE : EFFECT OF THE APPLICATION OF PLANT HORMONES |
| Authors: | Ph. Barthe, V. Vaillant, S. Gudin |
| Abstract:
The need for simple means of analysing vase life objectively has been stressed many times (Salunkhe et al., 1989). Trippi and Paulin (1984) have proposed a certain number of indicators of senescence for carnations, and the study of their evolution has made it possible to demonstrate that senescence in this species is a biphasic phenomenon. In order to carry out similar studies on the rose, we used parameters relating to water status and the properties of cell sap. Their modification with time reveals a continuous and, progressive evolution. There is also a good correlation between the different criteria. These parameters appear to be good indicators of senescence since their evolution can be modified by a hormone treatment that has an effective impact on the vase-life of the flower. In particular, analysis of these parameters highlights the dual effect of abscisic acid according to the way it is applied: they reflect therefore, in objective terms, the observations already made concerning flower life (Halevy and Mayak, 1974). They also demonstrate the favourable effects of cytokin treatment. | |
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