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Water stress, temperature regimes and light control induction, and loss of secondary dormancy in Brassica napus L. seeds

Published online by Cambridge University Press:  06 June 2017

Elias Soltani ,
Sabine Gruber ,
Mostafa Oveisi ,
Nader Salehi ,
Iraj Alahdadi  and
Majid Ghorbani Javid
Elias Soltani*
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Pakdasht, PO Box 11365/7117, Tehran, Iran
Sabine Gruber
Affiliation:
University of Hohenheim, Institute of Crop Science, Fruwirthstrasse 23, 70599 Stuttgart, Germany
Mostafa Oveisi
Affiliation:
Department of Agronomy and Plant Breeding, University of Tehran, Karaj, Iran
Nader Salehi
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Pakdasht, PO Box 11365/7117, Tehran, Iran
Iraj Alahdadi
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Pakdasht, PO Box 11365/7117, Tehran, Iran
Majid Ghorbani Javid
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Pakdasht, PO Box 11365/7117, Tehran, Iran
*
*Correspondence E-mail: elias.soltani@ut.ac.ir
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Abstract

This study investigated the induction and loss of dormancy in oilseed rape (Brassica napus). Twenty genotypes were preliminary screened; from these, two genotypes, RGS003 and Hayola 308, which possess high potential for dormancy induction (HSD) and medium potential to induce secondary dormancy (MSD), were selected. The stratification of seeds at alternating temperatures of 5–30°C (in dark) significantly relieved secondary dormancy, but dormancy was not fully released. The ψb(50) values were −1.05 and −1.06 MPa for the MSD and the HSD before dormancy induction. After inducing dormancy, the ψb(50) values for the MSD and the HSD were increased to −0.59 and −0.01 on day 0 stratification at 20°C. The hydrothermal time (θHT) value was low for one-day stratification for HSD in comparison with other stratification treatments. Water stress can induce dormancy (if the seeds have the genetic potential for secondary dormancy) and warm stratification (in dark) can only reduce the intensity of dormancy. The seeds with a high potential of dormancy induction can overcome dormancy at alternating temperatures and in the presence of light. It can, therefore, be concluded that a portion of seeds can enter the cycle of dormancy ↔ non-dormancy. The secondary dormant seeds of B. napus cannot become non-dormant in darkness, but the level of dormancy may change from maximum (after water stress) to minimum (after warm stratification). It seems that the dormancy imposed by the conditions of deep burial (darkness in combination with water stress and more constant temperatures) might be more important to seed persistence than secondary dormancy induction and release. The dormancy cycle is an important pre-requisite in order to sense the depth of burial and the best time for seed germination.

Keywords

conditional dormancyhydrothermal timeoilseed rapephysiological dormancy
Type
Research Papers
Information
Seed Science Research , Volume 27 , Issue 3 , September 2017 , pp. 217 - 230
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Copyright
Copyright © Cambridge University Press 2017 

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