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KMID : 0903619720110010035
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Journal of the Korean Society for Horticultural Science
1972 Volume.11 No. 1 p.35 ~ p.40
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On the Germination of Apple Seeds with Either Seed - Coat Removal , Abscisin , Benzyladenine , or Gibbrellin Treatments
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Abstract
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Seeds of Korean renowned apple varieties, America Summer Pearmain, Jonathan and Ralls Janet, were germinated on moisture-containing agar, and were determined for germinability by removal of seedcoats, with varied levels of either abscisin, benzyladenine or gibberellin.
Chilled seeds showed superior germinability than did the unchilled. Promoted seed germination was obtained when seedcoats were removed and relatively higher levels of either benzyladenine or gibberellin treated, while the highest level of these hormones tended to show the better effects. Benzyladenine treatment, however, resulted in seeds turning to darker chlorophyll formation in the cotyledons and having the larger sine than the control, whereas gibberellin caused enhanced cotyledon opening without altering cotyledon size. The highest level of the hormones applied showed occasional damages on germinating seedlings. Abscisin, on the contrary, inhibited the seed germination as the highest level tested showed most.
Discussions were made as to the idea that gibberellin is the primary stimulus in dormant apple-seed germination, while the promotive effect of benzyladenine is to weaken or to remove abscisin-like inhibitor in dormant (unchilled) apple seeds. Chilling apple seeds reduce certain inhibitor present in the seed, and removal of the seedcoats encounters losing this inhibitor tow and moisture. Perhaps physical nature of the seedcoat might have some influence on seed germination in addition to the hormonal actions.
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