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Abscisic acid transporters cooperate to control seed germination.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Kang Joohyun, Yim Sojeong, Choi Hyunju, Kim Areum, Lee Keun Pyo, Lopez-Molina Louis, Martinoia Enrico, Lee Youngsook,
Project Investigation of phytohormone transport and the fate of hypodermal passage cells, a cell type specialized to release strigolactones
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Original article (peer-reviewed)

Journal Nature Communication
Volume (Issue) 6
Page(s) 8113
Title of proceedings Nature Communication
DOI 10.1038/ncomms9113

Open Access

URL https://www.nature.com/articles/ncomms9113
Type of Open Access Publisher (Gold Open Access)

Abstract

Seed germination is a key developmental process that has to be tightly controlled to avoid germination under unfavourable conditions. Abscisic acid (ABA) is an essential repressor of seed germination. In Arabidopsis, it has been shown that the endosperm, a single cell layer surrounding the embryo, synthesizes and continuously releases ABA towards the embryo. The mechanism of ABA transport from the endosperm to the embryo was hitherto unknown. Here we show that four AtABCG transporters act in concert to deliver ABA from the endosperm to the embryo: AtABCG25 and AtABCG31 export ABA from the endosperm, whereas AtABCG30 and AtABCG40 import ABA into the embryo. Thus, this work establishes that radicle extension and subsequent embryonic growth are suppressed by the coordinated activity of multiple ABA transporters expressed in different tissues.
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