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Seeds of polyploid watermelon (Citrullus lanatus) often germinate poorly and thus need certain methods to improve germination. Diploid and tetraploid seeds of SS-8 and SS-11 lines were subjected to several treatments prior to germination at 30°C, including nicking at radicle end and soaking in distilled water, H₂O₂ (1 or 2%), gibberellic acid (0.5 or 5 mM), benzyladenine (0.5 or 5 mM) or KNO3 (3%) for 4 h, followed by drying for 5 days at 20℃ with 40% relative humidity. Seed reserves and water uptake pattern were also evaluated in different ploidy seeds. Protein and starch contents in seeds were high in the order of tetraploid, diploid, and triploid. The tetraploid seeds had higher dry and wet mass than its diploid counterparts. Moreover, the tetraploid seeds were partially filled with cotyledons and had 42-51% larger cavities than the diploid seeds. Water uptake was recorded high in the tetraploid seeds, however, the patterns of water uptake were similar. Seed treatments, nicking, and presoaking in distilled water and 2% H₂O₂ enhanced the germination of the tetraploid seeds with different genotypic responses.

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Abstract
Introduction
Materials and Methods
Results and Discussion
Acknowledgements
Literature Cited

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UCI(KEPA) : I410-ECN-0101-2009-525-016909367