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ISHS Acta Horticulturae 654: International Workshop on Models for Plant Growth and Control of Product Quality in Horticultural Production

MODELLING GROWTH OF THE PRIMARY SHOOT OF ROSE

Authors:   J.M. Costa, E. Heuvelink
Keywords:   propagation, Rosa, leafy stem cuttings, primary shoot, modelling
Abstract:
In propagation of rose by leafy stem cuttings, the area of the original leaf is a visible quality determinant of cuttings because it influences rooting (number and dry weight of roots) and length and dry weight of the primary shoot. In this paper a simple photosynthesis-based model is presented to predict elongation of the primary shoot of rose planting material derived from single node leafy stem cuttings. The model describes shoot elongation in response to changes in the original leaf area of cuttings during the first 11 weeks following severance. The model reasonably predicted primary shoot elongation but underestimated shoot length when leaf area was reduced by about 70% or when the complete leaf was removed at 7, 14 or 21 days after severance. The model accurately predicted carbohydrate accumulation during the first 3 weeks after severance. Simulations support the hypothesis that post-severance photosynthesis rather than the initial carbohydrate reserve level is the major determinant of primary shoot growth of single node leafy stem cuttings of rose.
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