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JXB Advance Access published online on June 2, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp178
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Quantitative description of the effect of stratification on dormancy release of grape seeds in response to various temperatures and water contents

W. Q. Wang1,2, S. Q. Song1, S. H. Li1, Y. Y. Gan1, J. H. Wu1,2 and H. Y. Cheng1,*

1Institute of Botany, the Chinese Academy of Sciences, Beijing, China
2Graduate University of the Chinese Academy of Sciences, Beijing, China

* To whom correspondence should be addressed. E-mail: hycheng{at}ibcas.ac.cn

The effect of stratification on dormancy release of grape seeds crossing from the sub- to the supraoptimal range of temperatures and water contents was analysed by modified threshold models. The stratification impacted on dormancy release in three different ways: (i) dormancy was consistently released with prolonged stratification time when stratified at temperatures of <15 °C; (ii) at 15 °C and 20 °C, the stratification effect initially increased, and then decreased with extended time; and (iii) stratification at 25 °C only reduced germinable seeds. These behaviours indicated that stratification could not only release primary dormancy but also induce secondary dormancy in grape seed. The rate of dormancy release changed linearly in two phases, while induction increased exponentially with increasing temperature. The thermal time approaches effectively quantified dormancy release only at suboptimal temperature, but a quantitative method to integrate the occurrence of dormancy release and induction at the same time could describe it well at either sub- or supraoptimal temperatures. The regression with the percentage of germinable seeds versus stratification temperature or water content within both the sub- and supraoptimal range revealed how the optimal temperature (Tso) and water content (Wso) for stratification changed. The Tso moved from 10.6 °C to 5.3 °C with prolonged time, while Wso declined from >0.40 g H2O g DW–1 at 5 °C to ~0.23 g H2O g DW–1 at 30 °C. Dormancy release in grape seeds can occur across a very wide range of conditions, which has important implications for their ability to adapt to a changeable environment in the wild.

Key words: ‘Ceiling’ temperature, dormancy induction, optimum temperature, optimum water content, physiological dormancy, thermal time, Vitis

Received 20 January 2009; Revised 6 May 2009 Accepted 8 May 2009


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