Morphological Characteristics and Germination as Affected by Low Temperature and GA in Orostachys 'Jirisan' and 'Jejuyeonhwa' Seeds, Korea Native Plant
This study was conducted to improve the seed germination by low temperature and GA₃ in Orostachys japonicus A. Berger (Jirisan) and O. iwarenge (Mak.) Hara (Jejuyeonhwa), Korean native plants. Observation of the seeds using a stereo microscope showed that all seeds of the two species have wrinkled s...
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Veröffentlicht in: | Weon'ye gwahag gi'sulji 2010-12, Vol.28 (6) |
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Sprache: | kor |
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Zusammenfassung: | This study was conducted to improve the seed germination by low temperature and GA₃ in Orostachys japonicus A. Berger (Jirisan) and O. iwarenge (Mak.) Hara (Jejuyeonhwa), Korean native plants. Observation of the seeds using a stereo microscope showed that all seeds of the two species have wrinkled surface and oblong shape. Seed size ranged 0.77-1.00/0.25-0.37 mm (length/width), indicating that the seeds are minute seeds. When the seeds of two Orostachsis species were sown into petri-dish and placed in a plant growth chamber of 10, 15, 20, or 25℃, 'Jirisan' showed seed germination below 20% at all temperatures and 'Jejuyeonhwa' 80% at only 10℃. Seed germination of 'Jirisan' increased up to 44% at 10℃ by low temperature (4℃) storage for 10 days, but decreased again at storage for more than 20 days. The seeds of 'Jejuyeonhwa' showed a large increase in seed germination by low temperature for 20-30 days, which was 95% at 10℃, but low temperature for more than 40 days significantly decreased seed germination. Dipping treatment in GA₃ solution of 50-400 mgㆍL-¹ for different periods (3, 6, 12, and 24 hrs) remarkably improved germination rate and speed in both species, 80-100% in 'Jirisan' and 90-100% in 'Jejuyeonhwa' at all concentrations and dipping times used in this study. |
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ISSN: | 1226-8763 |