Basic LEUCINE ZIPPER TRANSCRIPTION FACTOR 67 transactivates DELAY OF GERMINATION 1 to establish primary seed dormancy in Arabidopsis

A - Papers appearing in refereed journals

Bryant, F. M., Hughes, D. J., Hassani-Pak, K. and Eastmond, P. J. 2019. Basic LEUCINE ZIPPER TRANSCRIPTION FACTOR 67 transactivates DELAY OF GERMINATION 1 to establish primary seed dormancy in Arabidopsis. The Plant Cell.

AuthorsBryant, F. M., Hughes, D. J., Hassani-Pak, K. and Eastmond, P. J.
Abstract

Seed dormancy governs the timing of germination; one of the most important developmental transitions in a plant's life cycle. The DELAY OF GERMINATION 1 (DOG1) gene is a key regulator of seed dormancy and a major quantitative trait locus in Arabidopsis thaliana. DOG1 expression is under tight developmental and environmental regulation, but the transcription factors involved are not known. Here we show that basic LEUCINE ZIPPER TRANSCRIPTION FACTOR 67 (bZIP67) acts downstream of the central regulator of seed development LEAFY COTYLEDON 1 to transactivate DOG1 during maturation and help to establish primary dormancy. We show that bZIP67 overexpression enhances dormancy and bZIP67 protein (but not transcript) abundance is increased in seeds matured in cool conditions, providing a mechanism to explain how temperature regulates DOG1 expression. We also show that natural allelic variation in the DOG1 promoter affects bZIP67-dependent transactivation, providing a mechanism to explain ecotypic differences in seed dormancy that are controlled by the DOG1 locus.

KeywordsSeed dormancy ; Germination
Year of Publication2019
JournalThe Plant Cell
Digital Object Identifier (DOI)doi:10.1105/tpc.18.00892
PubMed ID30962396
Web address (URL)http://www.plantcell.org/content/early/2019/04/08/tpc.18.00892
Open accessPublished as ‘gold’ (paid) open access
Funder project or codeTailoring Plant Metabolism ISP
FunderBiotechnology and Biological Sciences Research Council
Publisher's versiontpc.18.00892.full.pdf
Output statusE-publication ahead of print
Publication dates
Online08 Apr 2019
Publication process dates
Accepted05 Apr 2019
Copyright licenseCC BY
PublisherAmerican Society of Plant Biologists (ASPB)
ISSN1532298X

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