Morphophysiological dormancy in seeds of the ANA grade angiosperm Schisandra arisanensis (Schisandraceae) |
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Authors: | CHING‐TE CHIEN SHUN‐YING CHEN JERRY M. BASKIN CAROL C. BASKIN |
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Affiliation: | 1. Division of Silviculture, Taiwan Forestry Research Institute, 53 Nan‐Hai Road, Taipei 10066, Taiwan;2. Departments of Biology;3. Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky 40506‐0225 and 40546‐0312, USA |
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Abstract: | We determined the kind of seed dormancy in Schisandra arisanensis, an ANA grade ([A]mborellales [N]ymphaeales [A]ustrobaileyales) angiosperm with medicinal value. Seeds have small underdeveloped embryos, and following seed maturity their length increased approximately 360% before radicle emergence. Germination was delayed 6–8 weeks, and the percentage and rate were much higher at 15/6, 20/10 and 25/15°C than at 30/20°C. For seeds incubated at 5/5°C (8 weeks) → 15/6°C (4 weeks) → 20/10°C (8 weeks) → 25/15°C (12 weeks) → 20/10°C (5 weeks), embryos grew at 15/6°C → 20/10°C, and almost all seeds that germinated (89%) did so at 20/10°C → 25/15°C. When seeds were incubated in a complementary temperature sequence, 25/15°C (12 weeks) → 20/10°C (8 weeks) → 15/6°C (4 weeks) → 5/5°C (9 weeks) → 15/6°C (4 weeks), embryos grew at 25/15°C → 20/10°C. Nearly all seeds that germinated (93%) did so at 25/15°C → 20/10°C and at 15/6°C following 9 weeks at 5/5°C. Based on the temperature requirements for embryo growth and seed germination, seeds of this species have non‐deep simple morphophysiological dormancy (C1bB). |
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Keywords: | basal angiosperm morphophysiological dormancy Schisandra seed dormancy seed germination underdeveloped embryo |
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