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Dynamics of dormancy during seed development of oilseed rape (Brassica napus L.)

Published online by Cambridge University Press:  19 May 2016

Shoubing Huang ,
Sabine Gruber ,
Falko Stockmann  and
Wilhelm Claupein
Shoubing Huang*
Affiliation:
University of Hohenheim, Institute of Crop Science, Fruwirthstr. 23, 70599 Stuttgart, Germany
Sabine Gruber
Affiliation:
University of Hohenheim, Institute of Crop Science, Fruwirthstr. 23, 70599 Stuttgart, Germany
Falko Stockmann
Affiliation:
University of Hohenheim, Institute of Crop Science, Fruwirthstr. 23, 70599 Stuttgart, Germany
Wilhelm Claupein
Affiliation:
University of Hohenheim, Institute of Crop Science, Fruwirthstr. 23, 70599 Stuttgart, Germany
*
*Correspondence Email: [email protected]
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Abstract

Seed dormancy is a critical factor in determining seed persistence in the soil and can create oilseed rape (Brassica napus L.) volunteer problems in subsequent years. A 3-year field trial in south-west Germany investigated the effects of seed maturity on primary dormancy and disposition to secondary dormancy of ten oilseed rape varieties (lines) in 2009 and 2010, and of five imidazolinone-tolerant varieties (hybrids) in 2014. Fresh seeds were sampled weekly from about 30 d after flowering (DAF) until full maturity and tested for dormancy on the day of seed collection. Primary dormancy decreased from a high level of 70−99% at 30−40 DAF to 0−15% after 7−14 d, coinciding with embryo growth and depending on variety and year. For some oilseed rape varieties, 30−50% primary dormancy was still present in mature seeds. Depending on variety, disposition to secondary dormancy was nearly zero at the early stage of seed development, increased to its highest level during development, and decreased afterwards. Some varieties maintained a high level of secondary dormancy at maturity or during the entire seed development period. The correlation between primary dormancy and secondary dormancy was significantly positive at early seed development (r = 0.95, 50 DAF), but declined in mature seeds. Environmental conditions during ripening are also expected to affect dormancy dynamics. The deeper insights into dormancy formation of oilseed rape provide the possibility to improve harvest time and harvest method, and to better assess the potential for volunteer oilseed rape in following crops.

Keywords

abscisic acidcanoladormancyharvest dateseed bankvolunteers
Type
Research Papers
Information
Seed Science Research , Volume 26 , Issue 3 , September 2016 , pp. 245 - 253
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Copyright
Copyright © Cambridge University Press 2016 

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