Basic LEUCINE ZIPPER TRANSCRIPTION FACTOR67 Transactivates to Establish Primary Seed Dormancy in Arabidopsis

Overview

Journal Plant Cell

Publisher Oxford University Press

Specialties Biology
Cell Biology

Date 2019 Apr 10

PMID 30962396

Citations 27

Authors

Fiona M Bryant

David Hughes

Keywan Hassani-Pak

Peter J Eastmond

Affiliations

Soon will be listed here.

Abstract

Seed dormancy governs the timing of germination, one of the most important developmental transitions in a plant's life cycle. The () gene is a key regulator of seed dormancy and a major quantitative trait locus in Arabidopsis (). expression is under tight developmental and environmental regulation, but the transcription factors involved are not known. Here we show that basic LEUCINE ZIPPER TRANSCRIPTION FACTOR67 (bZIP67) acts downstream of the central regulator of seed development, LEAFY COTYLEDON1, to transactivate during maturation and help to establish primary dormancy. We show that overexpression enhances dormancy and that bZIP67 protein (but not transcript) abundance is increased in seeds matured in cool conditions, providing a mechanism to explain how temperature regulates expression. We also show that natural allelic variation in the promoter affects bZIP67-dependent transactivation, providing a mechanism to explain ecotypic differences in seed dormancy that are controlled by the locus.

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