ISHS Acta Horticulturae 416: IV International Symposium on Computer Modelling in Fruit Research and Orchard Management
MODELLING VARIATIONS OF METAMER EMERGENCE RATE IN PEACH TREES |
| Authors: | L. Pagès, J. Kervella, M. Génard |
| Abstract:
The metamer (set of node, internode, leaf, and axillary bud) emergence rate is an important aspect for quantifying growth and development. It is related to the dynamics of shoot length and leaf area. It was studied on young Peach and Nectarine (Prunus persica (L.) Batsch) trees belonging to nine standard cultivars. The metamer emergence rate was derived from the number of unfolded leaves that was recorded throughout the growing season on order 1 axes (originating directly from the grafted buds), and on order 2 and order 3 axes (which appeared acropetally as sylleptic shoots). Both time-dependent, within-tree, and genetic variations were studied using mono-molecular models that were fitted on the different axes. This simple model was shown to fit adequately the actual data. The metamer emergence rate was gradually decreasing during the season, from April to October. It was also decreasing according to the branching order (from order 1 to order 3), and to the level of insertion along the mother axis (from base to top). Significant differences were found between cultivars, and these differences were similar for the different types of shoots. The model was also used to show the consequences of these differences in metamer emergence rate kinetics on the whole architecture of the trees. | |
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