ISHS Acta Horticulturae 440: International Symposium on Plant Production in Closed Ecosystems
POTENTIAL OF GROWTH AND FLOWERING IN SINGLE-STEMMED ROSE (ROSA HYBRIDA L.) PLANTS AS AFFECTED BY TOPOPHYSIS |
| Authors: | N. Bredmose, J. Hansen |
| Keywords: | flowering, growth efficiency, growth potential, Rosa hybrida, single-stemmed plants, synchronization, topophysis |
| Abstract:
Automation of cut rose production can be accomplished if plants can be grown single-stemmed for robotic harvest and handling. We studied the physiological basis for single-stemmed cut rose production in a glasshouse and the synchronization of plant growth and flowering. Topophysis, the effect on growth and differentiation of position of axillary buds along the shoot, was studied in three cultivars by growing single-node cuttings from seven stem positions as single-stemmed plants in rockwool-cubes on ebb-flow units. After release of the axillary buds from apical dominance by excision, morphogenetic development was studied until anthesis. Generally, the onset of axillary bud growth was earlier from apical bud positions, whereas stems were longer and number of nodes was greater from basal bud positions. Biomass build-up was greatest from medial bud positions. If plant growth potential was expressed by fresh biomass accumulation, growth efficiency by fresh biomass efficiency and growth rate, and plant quality by specific fresh weight, then axillary buds from positions 4–6 had the highest growth potential, those from positions 2–6 had the highest growth efficiency, and those from positions 4–6 gave the best plant quality. Our results show that in R. hybrida topophysis is intrinsic to the bud, determines growth potential, and is a decisive tool for synchronization of development and flowering, which is essential to automation. | |
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