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KMID : 0903620040450050233
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Journal of the Korean Society for Horticultural Science
2004 Volume.45 No. 5 p.233 ~ p.237
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Polyploidy Affects Fruit Characteristics, Seed Morphology, and Germination in Watermelon (Citrullus lanatus)
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Jaskani Muhammad J.
Kwon Sung-Whan
Kim Eun-Ju
Ko Bok-Rae
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Abstract
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Tetraploids are used as breeding parents in triploid watermelon seed production programs. Colchicineinduced tetraploids were compared with diploids for their fruit characteristics, seed morphology, and germination. Tetraploids had thicker fruit rind thickness (17.6 ㎜) but less number of seeds/fruit (31.3) than diploids. Tetraploid seeds were shown increased length (9.1 ㎜), width (6.3 ㎜) and thickness (2.8 ㎜). Moreover, the seed coat of tetraploids had fissures along the longitudinal axis. Diploid seeds showed almost completely filled cavity whereas tetraploids produced weak embryos, showed some empty cavity and lower seed germination than diploids. Among different seed germination treatments, seed coat removal and seed nicking at radicle end showed high germination rates (84.3 and 77.1%, respectively). Adherence of thick seedcoat to cotyledons in tetraploid seeds was reduced by planting seeds in pots with the radicle end up at 90° angle. Increased size of cotyledons and leaves in tetraploid seedlings than diploids was also recorded.
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KEYWORD
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fertility, leaf area, ploidy, rind thickness, seed germination
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