NDLI: The time required for dormancy release in Arabidopsis is determined by DELAY OF GERMINATION1 protein levels in freshly harvested seeds.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Nakabayashi, Kazumi Bartsch, Melanie Xiang, Yong Miatton, Emma Pellengahr, Silke Yano, Ryoichi Seo, Mitsunori Soppe, Wim J. J.
Description	Country affiliation: Germany Author Affiliation: Nakabayashi K ( Department of Plant Breeding and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany. nakabaya@mpipz.mpg.de)
Abstract	Seed dormancy controls the start of a plant's life cycle by preventing germination of a viable seed in an unfavorable season. Freshly harvested seeds usually show a high level of dormancy, which is gradually released during dry storage (after-ripening). Abscisic acid (ABA) has been identified as an essential factor for the induction of dormancy, whereas gibberellins (GAs) are required for germination. The molecular mechanisms controlling seed dormancy are not well understood. DELAY OF GERMINATION1 (DOG1) was recently identified as a major regulator of dormancy in Arabidopsis thaliana. Here, we show that the DOG1 protein accumulates during seed maturation and remains stable throughout seed storage and imbibition. The levels of DOG1 protein in freshly harvested seeds highly correlate with dormancy. The DOG1 protein becomes modified during after-ripening, and its levels in stored seeds do not correlate with germination potential. Although ABA levels in dog1 mutants are reduced and GA levels enhanced, we show that DOG1 does not regulate dormancy primarily via changes in hormone levels. We propose that DOG1 protein abundance in freshly harvested seeds acts as a timer for seed dormancy release, which functions largely independent from ABA.
File Format	HTM / HTML
ISSN	10404651
e-ISSN	1531298X
DOI	10.1105/tpc.112.100214
Journal	THE PLANT CELL ONLINE
Issue Number	7
Volume Number	24
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2012-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Botany Abscisic Acid Metabolism Arabidopsis Proteins Arabidopsis Physiology Plant Dormancy Plant Growth Regulators Cytology Genetics Gene Expression Regulation, Plant Germination Gibberellins Mutation Plants, Genetically Modified Rna, Messenger Rna, Plant Signal Transduction Temperature Time Factors Up-regulation Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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The Time Required for Dormancy Release in Arabidopsis Is Determined by DELAY OF GERMINATION1 Protein Levels in Freshly Harvested Seeds [OA]

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