ISHS Acta Horticulturae 359: V International Symposium on Plum and Prune Genetic, Breeding and Pomology
NON-STRUCTURAL CARBOHYDRATES IN FLOWER BUDS AND VEGETATIVE BUDS IN PRUNE TREES |
| Authors: | A. Moing, B. Lafargue, J. Lespinasse, J. Gaudillère |
| Abstract:
To study the relationships between shoot carbohydrate status and bud type in prune trees, one French Prune cv. (Prunus domestica L.) was grafted on the rootstock cv. IshtaraR (Prunus salicina X (P. cerasifera X Prunus persica)). Two growth seasons after transplanting in the orchard, long shoots were harvested at leaf fall. The buds and the piece of bark just below the buds were sampled. The bud types were identified using dissection under the microscope. Flower buds were absent from the basal part of the main shoots. They were most frequent in the upper-mid part of the shoots. They were usually lateral buds situated near a central vegetative bud. Although the dry weight of vegetative buds was quite variable, flower buds had lower dry weights than vegetative buds. Glucose and sucrose concentrations were the same in all bud types. Fructose and sorbitol concentrations were higher in flower buds than in vegetative buds. Raffinose + stachyose and starch concentrations were lower in flower buds than in vegetative buds. Vegetative buds isolated or bordered on lateral vegetative bud(s), and vegetative buds bordered on lateral flower bud(s), had the same concentrations for all soluble carbohydrates. However, the former had higher starch concentrations than the latter. The pieces of bark situated just below vegetative bud(s), or below a vegetative bud associated with one or two flower buds, had the same hexose, sorbitol and sucrose concentrations. Raffinose and stachyose concentrations were lower, and starch concentrations were higher, in the pieces of bark below a vegetative bud associated with one or two flower buds than below vegetative bud(s) only. These results are discussed in relation with seasonal non-structural carbohydrate changes and with partitioning among neighbouring buds. | |
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