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Effects of Hydro- and PEG-priming on the Lettuce(Lactuca sativa Seeds Germination at High Temperature
The sixth hour after imbibition was the rapid absorbtion stage of lettuce seed cv. Flat Leaf and seed moisture content increased in course of time. From the sixth to tenth hour was the lag phase and seeds were germinated at the twelfth hour after imbibition with the moisture content of 47.7﹪. Six hours imbibition at 25℃ then transfered to 20℃ for one day could overcome the thermoinhibition of seeds. Germination percentage of drying and undrying seeds were 96.4 and 98.3﹪ respectively, in comparision to nearly zero for seeds without imbibition treatment. Priming seeds with PEG-1.0MPa at 10,15 and 20℃ for 1, 2 and 3 days showed good germination either at 20 or 34℃. Most of drying-back priming seeds had lower germination rate at temperature of 34℃. Seed treated with PEG-1.0MPa at 15℃ for 3 days had the highest germination of 89.3﹪ at 34℃.Seeds vigor were not affected by time of storage and all treated seeds showed more than 94﹪in seed germination at 20℃. Seed germination percentage was significantly decreased at 34℃.The best treatment was 20℃ for 3 days with PEG-1.0MPa which had germination of 80.7﹪after 6 weeks of storage. Priming treatment could enhance growth of lettuce in high temperature. Seeds treated with PEG-1.0MPa for 3 days at 15℃ showed better growth in plant height, fresh weight, dry weight and leaf area after 35 days of emergence.
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