ISHS Acta Horticulturae 755: International Conference on Quality Management in Supply Chains of Ornamentals
DESICCATION TOLERANCE OF SUNFLOWER SEEDS AT ELEVATED TEMPERATURES |
| Authors: | S. Photchanachai, T. Boonchu |
| Keywords: | sunflower seed, ageing, germination, vigor |
| DOI: | 10.17660/ActaHortic.2007.755.75 |
| Abstract:
Sunflower seeds (Hygrophila difformis L.) with initial moisture content of 8.66% and 89.25% germination were packed in laminated (PET/Al/PE, 160 µm- thickness) bags and aged in different temperatures (20-50°C) for 14 days. Accelerated ageing of sunflower seeds in a desiccation condition at temperatures above 40°C resulted in remarked decline in germination percentage and delay in further germination rate, monitored by germination index (GI), GI50 and GI10-90. The seeds aged especially at 50°C had significantly lowest germination percentage (59.00%) compared to the seeds at 40°C (75.25%), 30°C (81.50%) and 20°C (81.75%). The germination rate was also significantly reduced in the seeds aged at 50°C. According to a regression model assessment, ≥75% germination, accepted by Thai seed act, of the seeds stored in a shelf above 35°C will be difficult to obtain after 14 days. | |
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