Abscisic acid transporters cooperate to control seed germination

Joohyun Kang, Sojeong Yim, Hyunju Choi, Areum Kim, Keun Pyo Lee, Luis Lopez-Molina, Enrico Martinoia and Youngsook Lee ()
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Joohyun Kang: Institut für Pflanzenbiologie, Universität Zürich
Sojeong Yim: POSTECH-UZH Global Research Laboratory, Pohang University of Science and Technology
Hyunju Choi: POSTECH-UZH Global Research Laboratory, Pohang University of Science and Technology
Areum Kim: POSTECH-UZH Global Research Laboratory, Pohang University of Science and Technology
Keun Pyo Lee: Départment de Biologie Végétale, Université de Genève
Luis Lopez-Molina: Départment de Biologie Végétale, Université de Genève
Enrico Martinoia: Institut für Pflanzenbiologie, Universität Zürich
Youngsook Lee: POSTECH-UZH Global Research Laboratory, Pohang University of Science and Technology

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9113

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