ISHS Acta Horticulturae 813: VI International Symposium on New Floricultural Crops
HYMENOCALLIS SALISB. - BULBS REACTIONS TO APPLIED TEMPERATURES |
| Authors: | M.W. Borys, H. Leszczynska-Borys, J.L. Galván |
| Keywords: | H. harrisiana, H. jaliscensis, xerophyte, laboratory, field temperature, root, leaves, flowering |
| Abstract:
The main objective of this experiment was to define the duration of bulb dormancy and temperatures that perhaps could be used to break it, in species belonging to xerophyte obligate group of Hymenocallis: H. harrisiana Herbert (H-3) and H. jaliscensis M. E. Jones (H-4). Bulbs were harvested on 10 September 2005 after leaves were lost, and stored dry at 18 to 22°C until use. The temperatures used were 10, 15, 20, 25, 30°C (H-3) and 10, 15, 20, 25, 30, and 35°C (H-4). Bulbs were taken out of storage February 9, April 3 and April 15, 2006 for planting at indicated temperatures. As storage time progressed, the response time shortened and the temperature to initiate the emission of leaves and scapes lowered. The temperature required to initiate the emission of leaves and scapes differed for each of the species. The field soil temperature (maximum 24-32°C - minimum 11.3-16.7°C) was almost equal to the successful laboratory temperature (18-22°C) for H-4 foliation and flowering of bulbs stored from September to April. Thus, bulbs growing under the open field and stored under laboratory conditions terminated dormancy almost at the same time. Data suggest that neither clone is suited for forced flowering. The thermal requirements were higher for H-3 bulbs. These bulbs gave a higher mass of leaves and bulbs at 30°C than at lower temperatures. In contrast, H-4 bulbs reacted with equal mass at 20, 25 and 30°C. | |
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