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KMID : 0903619950360020192
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Journal of the Korean Society for Horticultural Science
1995 Volume.36 No. 2 p.192 ~ p.198
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Effects of oxygen Concentrations and Water potentials during Priming on Seed Germination of Muskmelon
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Dale O-Wilson
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Abstract
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This work was carried out to study the joint effects of oxygen supply, water potential on the muskmelon seed germination performance during priming. Muskmelon seeds were primed in polyethylene glycol (PEG 8,000) solution at different supplied oxygen concentrations into the vessels and water potentials for up to 10 days at 25C in stirred 500 ㎖ vessels. Priming under high oxygen levels with high water potentials decreased germination percentage from 92% to 40% as the duration of priming increased. However, germination percentages of seeds primed under intermediate water potentials and low water potentials were slowly decreased from 92% to 78% after 3 days priming. At the same oxygen level, germination was controlled by different water potentials. Priming under low oxygen level did not reduce germination except at high water potential after 5 days priming. Priming under high oxygen and high water potentials declined time to 50% germination (T_(50)) from 110 to 56 h. There was no difference in T_(50) between intermediate water potentials and low water potentials. By contrast, priming at low oxygen with high water potential decreased T_(50) from 111 to 38 h. Based on the present results, priming in pure water with low oxygen ($gt;=21%) may be the best approach to muskmelon seed priming.
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KEYWORD
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