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A Perspective on Secondary Seed Dormancy in Arabidopsis thaliana

Department of Botany and Plant Biology, University of Geneva, CH-1211 Geneva, Switzerland
Plants 2020, 9(6), 749; https://doi.org/10.3390/plants9060749
Received: 17 May 2020 / Revised: 8 June 2020 / Accepted: 12 June 2020 / Published: 15 June 2020
(This article belongs to the Section Plant Physiology and Metabolism)
Primary seed dormancy is the phenomenon whereby seeds newly shed by the mother plant are unable to germinate under otherwise favorable conditions for germination. Primary dormancy is released during dry seed storage (after-ripening), and the seeds acquire the capacity to germinate upon imbibition under favorable conditions, i.e., they become non-dormant. Primary dormancy can also be released from the seed by various treatments, for example, by cold imbibition (stratification). Non-dormant seeds can temporarily block their germination if exposed to unfavorable conditions upon seed imbibition until favorable conditions are available. Nevertheless, prolonged unfavorable conditions will re-induce dormancy, i.e., germination will be blocked upon exposure to favorable conditions. This phenomenon is referred to as secondary dormancy. Relative to primary dormancy, the mechanisms underlying secondary dormancy remain understudied in Arabidopsis thaliana and largely unknown. This is partly due to the experimental difficulty in observing secondary dormancy in the laboratory and the absence of established experimental protocols. Here, an overview is provided of the current knowledge on secondary dormancy focusing on A. thaliana, and a working model describing secondary dormancy is proposed, focusing on the interaction of primary and secondary dormancy. View Full-Text
Keywords: secondary seed dormancy; dormancy cycling; germination arrest; abscisic acid; seed dormancy; environmental factors; Arabidopsis thaliana secondary seed dormancy; dormancy cycling; germination arrest; abscisic acid; seed dormancy; environmental factors; Arabidopsis thaliana
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Buijs, G. A Perspective on Secondary Seed Dormancy in Arabidopsis thaliana. Plants 2020, 9, 749.

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