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Sensitivity cycling to physical dormancy break and seed vigour of two Ipomoea species (Convolvulaceae)

Published online by Cambridge University Press:  01 December 2009

K.M.G. Gehan Jayasuriya ,
Jerry M. Baskin ,
Dennis M. Tekrony  and
Carol C. Baskin
K.M.G. Gehan Jayasuriya
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY40506, USA
Jerry M. Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY40506, USA
Dennis M. Tekrony
Affiliation:
Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY40546, USA
Carol C. Baskin*
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY40506, USA Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY40546, USA
*
*Correspondence Fax: +1-859-257-1717 Email: [email protected]
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Abstract

The physically dormant seeds of Ipomoea lacunosa and of I. hederacea undergo sensitivity cycling (insensitive ↔  sensitive) to dormancy-breaking treatment. Sensitivity cycling is important to seeds with physical dormancy in sensing appropriate environmental conditions for germination. Seed vigour is also important to seedling establishment, but no study has compared changes in vigour (or not) with changes in sensitivity. This study was conducted to determine the relationship between sensitivity cycling and seed vigour in I. lacunosa and I. hederacea. The seed moisture contents of insensitive and sensitive seeds of I. lacunosa and of sensitive seeds of I. hederacea were measured, and several vigour tests were performed. Vigour of sensitive seeds of I. lacunosa decreased more rapidly than that of insensitive seeds. No significant change in vigour was observed in either permeable or impermeable seeds of I. hederacea. We conclude that sensitivity cycling to physical dormancy break is important in maintaining vigour of I. lacunosa seeds in the soil seed-bank.

Keywords

Ipomoea hederaceaIpomoea lacunosaphysical dormancyseed vigoursensitivity cycling
Type
Research Article
Information
Seed Science Research , Volume 19 , Issue 4 , December 2009 , pp. 249 - 259
Copyright
Copyright © Cambridge University Press 2009

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