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KMID : 0903619950360050628
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 5 p.628 ~ p.634
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Effects of Oxygen Concentrations on Germination during Onion and Sugar Beet Seed Priming
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Dale O-Wilson
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Abstract
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Effects of oxygen in osmotic priming of onion and sugar beet seeds were evaluated. Seeds were primed in water and polyethylene glycol (PEG) 8,000 solution with nitrogen, air and oxygen supply for up to 5 days at 25℃ in 0.5 liter stirred glass vessels, rinsed and dried. Germination percentage of untreated seeds was 89% for onion and 86% for sugar beet seeds. The germination percentage of onion and sugar beet seeds was affected by oxygen concentrations. At the nitrogen supply, maximum germination percentage (97%. 96%) of onion and sugar beet seeds occurred at two day treatment and then gradually decreased. Extending the priming duration at water or -1 ㎫ with pure oxygen over 1 day generally resulted in a decrease in germination percentage. Mean days to germination of untreated seeds were 2.5 days for onion and 3.7 days for sugar beet seeds. Mean days to germination were reduced by soaking with low oxygen supply from 2.5 to 2.1 for onion and from 3.7 to 1.7 for sugar beet. By contrast, means to germination of priming onion seeds at -1 ㎫ with pure oxygen increased from 2.5 to 3.5 days. Results suggested that high oxygen in priming solution was not necessary for obtaining benefits of priming. Even anaerobic conditions increased priming effects and priming duration of more than 2 days at any gas condition reduced priming effects so that short priming was recommended.
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