Coordination of seed dormancy and germination processes by MYB96

Kyounghee Lee; Pil Joon Seo

doi:10.1080/15592324.2015.1056423

Coordination of seed dormancy and germination processes by MYB96

Plant Signal Behav. 2015;10(9):e1056423. doi: 10.1080/15592324.2015.1056423.

Authors

Kyounghee Lee¹, Pil Joon Seo^{1

2}

Affiliations

¹ a Department of Bioactive Material Sciences and Research Center of Bioactive Materials ; Chonbuk National University ; Jeonju , Korea.
² b Department of Chemistry and Research Institute of Physics and Chemistry ; Chonbuk National University ; Jeonju , Korea.

Abstract

The transition between seed dormancy and germination is an important stage that initiates plant life cycle. Hormonal balances of abscisic acid (ABA) and gibberellin (GA) contribute to determining the proper timing to germinate. Here, we demonstrate that the R2R3-type MYB96 transcription factor, a key ABA signaling mediator, coordinates seed dormancy and germination processes through distinct downstream events. This transcription factor controls ABA-INSENSITIVE 4 (ABI4) expression to inhibit seed germination by suppressing breakdown of lipid reserves in embryo. In addition, it also induces seed dormancy by stimulating ABA biosynthesis in an ABI4-independent manner. We propose that MYB96 integrates a multitude of environmental stress signals and acts as a master regulator in the determination of timing for seed germination.

Keywords: ABI4; Arabidopsis; MYB96; abscisic acid; seed dormancy; seed germination.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Arabidopsis / physiology*
Arabidopsis Proteins / metabolism*
Germination*
Models, Biological
Plant Dormancy*
Seeds / growth & development*
Transcription Factors / metabolism*

Substances

Arabidopsis Proteins
MYB96 protein, Arabidopsis
Transcription Factors