ISHS Acta Horticulturae 589: X International Asparagus Symposium
EFFECTS OF DAYLENGTH ON DRY MATTER PARTITIONING IN ASPARAGUS |
| Authors: | D.J. Woolley, D.J. Karno, M.A. Nichols |
| Keywords: | photoperiod, fructans, storage carbohydrate, root to shoot ratio, temperature. |
| Abstract:
Previous work by us indicated that an abrupt change in partitioning of carbohydrate towards the storage roots might possibly be controlled by daylength. Environmental control cabinets were used to test this hypothesis. All environmental conditions, including total radiation received, were kept constant except for day-length. When compared to a constant day-length of 15.5 hours a reducing day-length resulted in an abrupt increase in the amount of dry matter partitioning to the storage roots compared to the shoot system. Increased root mass was particularly evident at a daylength of about 14 hours followed by a decrease in fern production. Under the conditions of the experiment this increase in partitioning to the root system did not continue at shorter daylengths. It is suggested that a high continuing root-to-shoot partitioning ratio may depend on low temperature. | |
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