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Germination of Viburnum odoratissimum seeds: a new level of morphophysiological dormancy

Published online by Cambridge University Press:  01 September 2008

Carol C. Baskin ,
Ching-Te Chien ,
Shun-Ying Chen  and
Jerry M. Baskin
Carol C. Baskin*
Affiliation:
Department of Biology, University of Kentucky, Lexington, Kentucky40506, USA Department of Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky40546, USA
Ching-Te Chien
Affiliation:
Division of Silviculture, Taiwan Forestry Research Institute, Taipei, Taiwan
Shun-Ying Chen
Affiliation:
Division of Forest Biology, Taiwan Forestry Research Institute, Taipei, Taiwan
Jerry M. Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, Kentucky40506, USA
*
*Correspondence Fax: +1-859-257-1717 Email: ccbask0@uky.edu
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Abstract

Previous studies indicated that seeds of Viburnum odoratissimum had only physiological dormancy (PD), but no measurements of embryos were made during the dormancy-break treatments. Thus, we investigated embryo growth and radicle and cotyledon emergence over a range of temperatures. Seeds have underdeveloped embryos, and their length increased about 300% before radicle emergence. Embryos also had PD, as evidenced by delays in beginning of embryo growth (2–3 weeks) and of germination after embryos were elongated (4 weeks). After radicle emergence, epicotyl emergence was delayed 1–8 weeks, depending on incubation temperature, but cold stratification was not required to break PD of the epicotyl. Unlike seeds of many previously studied Viburnum spp., epicotyls of V. odoratissimum have non-deep, rather than deep, PD. Hence, a new level of MPD called non-deep, simple, epicotyl MPD has been identified.

Keywords

epicotyl dormancymorphophysiological dormancyseed dormancyseed germinationViburnum
Type
Short Communication
Information
Seed Science Research , Volume 18 , Issue 3 , September 2008 , pp. 179 - 184
Copyright
Copyright © Cambridge University Press 2008

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