ISHS Acta Horticulturae 352: VI International Symposium on Rubus and Ribes
CHILLING AFFECTS FLOWERING OF PRIMOCANE-FRUITING 'HERITAGE' RED RASPBERRY |
| Author: | F. Takeda |
| Keywords: | Rubus idaeus, greenhouse culture |
| Abstract:
The effect of chilling on growth and development of 'Heritage' red raspberry (Rubus idaeus L.) primocanes was studied. Tissue-cultured plants were grown in 10-liter containers, flowered, and pruned back to the soil line. Subsequently plants were given from 0 to about 1,050 chill units (CU) and then returned to a heated greenhouse with a 16-h photoperiod for eight months. Growth of plants with 0 or low CU was either short with rosetted leaves or indeterminate. One plant developed several flower buds after more than 7 months in the greenhouse. Plants that received about 500 CU grew 3 m high and flowered after 6 months. Plants given more than 750 CU flowered in less than 4 months when the primocane had 25 to 30 nodes. Results of this study suggest that the sequence of growth and development in primocane-fruiting raspberries is effected strongly by low temperature exposure prior to shoot emergence. To induce flowering in 'Heritage' primocanes within 4 months in the greenhouse, plants must be given a minimum of 750 CU prior to cane emergence. | |
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