Journal
SEED SCIENCE RESEARCH
Volume 18, Issue 3, Pages 179-184Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0960258508042177
Keywords
epicotyl dormancy; morphophysiological dormancy; seed dormancy; seed germination; Viburnum
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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.
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