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Investigation of variable storage conditions for cultivated northern wild rice and their effects on seed viability and dormancy

Published online by Cambridge University Press:  16 April 2020

Lillian McGilp ,
Jacques Duquette ,
Daniel Braaten ,
Jennifer Kimball Open the ORCID record for Jennifer Kimball [Opens in a new window]  and
Raymond Porter
Lillian McGilp
Affiliation:
Department of Agronomy and Plant Genetics, University of Minnesota-Twin Cities, St. Paul, MN, USA
Jacques Duquette
Affiliation:
North Central Research and Outreach Center, University of Minnesota, Grand Rapids, MN, USA
Daniel Braaten
Affiliation:
North Central Research and Outreach Center, University of Minnesota, Grand Rapids, MN, USA
Jennifer Kimball*
Affiliation:
Department of Agronomy and Plant Genetics, University of Minnesota-Twin Cities, St. Paul, MN, USA
Raymond Porter
Affiliation:
Haupert Institute for Agricultural Studies, Huntington University, Huntington, IN, USA
*
Correspondence: Jennifer Kimball, E-mail: jkimball@umn.edu
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Abstract

Cultivated northern wild rice (NWR; Zizania palustris L.) has been bred and studied since the 1950s. One challenge facing researchers is the lack of storage options, due to the seed's unorthodox behaviour. This study evaluated varying storage temperature and moisture conditions for the maintenance of seed viability and dormancy breaking in Minnesota-grown NWR. First, seeds were placed in non-submerged, freezing storage (NSFS) for 12–26 weeks, then in submerged, cold storage (SCS) for 2 weeks. The addition of SCS increased germination (%G) relative to NSFS alone (<0.1% NSFS, 15% NSFS and SCS), indicating that NSFS does not kill seeds but also does not break seed dormancy. Next, the required length of SCS was evaluated by placing seeds in NSFS for 12 weeks and then in SCS for 2–14 weeks. A longer SCS period increased %G from 3 to 79%, at 2 and 14 weeks of SCS, respectively. Lastly, seeds were placed in NSFS, followed by SCS, at varying intervals over a 29-week period. Across lines, germination increased from 20 to 76% between 4 and 7 weeks of SCS, respectively, then plateaued. The results of this study indicate that NSFS could be used to store NWR seeds, but at least 7 weeks in SCS is required to overcome dormancy. Additionally, while NSFS did not break seed dormancy, physiological changes related to stratification processes were occurring in non-submerged, freezing conditions. Results also suggest that the genotypic variation in NWR could be utilized for selection to improve germination and storage viability.

Keywords

dormancygerminationrecalcitranceseed storagestratificationwild riceZizania palustris
Type
Research Paper
Information
Seed Science Research , Volume 30 , Issue 1 , March 2020 , pp. 21 - 28
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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