<scp>ABA</scp> importers <scp>ABCG17</scp> and <scp>ABCG18</scp> redundantly regulate seed size in <i>Arabidopsis</i>

The stress hormone abscisic acid (ABA) plays a crucial role in mediating plant responses to the environment and regulating plant development. In this study, we demonstrate that two ABA importers, ABCG17 and ABCG18, control seed size by regulating the ABA levels transported into the embryo. Double knockdown of ABCG17 and ABCG18 resulted in lower ABA accumulation in the embryo, wider siliques, and increased overall seed size. Leaf phloem-specific ABA induction in the aba2-1 background showed that ABA could move from the vasculature to control seed size. ABCG17 and ABCG18 are expressed in leaves, and the reproductive organs septum, and valves but not in the developing seeds, suggesting that ABCG17 and ABCG18 affect seed size maternally. Together, the results shed light on the molecular mechanisms by which ABA is transported to the embryo to determine seed size.

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Institutions

Publication Details

Journal
The Plant Journal
Published
2025-03-01
DOI
https://doi.org/10.1111/tpj.70096
Citations
9
Primary Topic
Seed Germination and Physiology
Type
article
Field-Weighted Citation Impact
15.75

Funders

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article

ABA importers ABCG17 and ABCG18 redundantly regulate seed size in Arabidopsis

Moran Anfang, Hamutal Bar, Alexander M. Jones, James Rowe et al.
9 citations
The Plant Journal
Seed Germination and Physiology
15.75
article

ABA importers ABCG17 and ABCG18 redundantly regulate seed size in Arabidopsis

Moran Anfang, Hamutal Bar, Alexander M. Jones, James Rowe, Eilon Shani, Annalisa Rizza, Laurence Charrier, Markus Geisler, Yuqin Zhang, Zhuorong Li, Ning Su
article en
9 citations

Abstract

The stress hormone abscisic acid (ABA) plays a crucial role in mediating plant responses to the environment and regulating plant development. In this study, we demonstrate that two ABA importers, ABCG17 and ABCG18, control seed size by regulating the ABA levels transported into the embryo. Double knockdown of ABCG17 and ABCG18 resulted in lower ABA accumulation in the embryo, wider siliques, and increased overall seed size. Leaf phloem-specific ABA induction in the aba2-1 background showed that ABA could move from the vasculature to control seed size. ABCG17 and ABCG18 are expressed in leaves, and the reproductive organs septum, and valves but not in the developing seeds, suggesting that ABCG17 and ABCG18 affect seed size maternally. Together, the results shed light on the molecular mechanisms by which ABA is transported to the embryo to determine seed size.

The Plant JournalVol. 121(6)
University of Fribourg (CH), Tel Aviv University (IL), Chinese Academy of Sciences (CN), University of Cambridge (GB), Sainsbury Laboratory (GB), Institute of Genetics and Developmental Biology (CN), University of Chinese Academy of Sciences (CN)
Gatsby Charitable Foundation, Israel Science Foundation
Openalex Percentile: Top 1%
Seed Germination and Physiology
15.75
DOIOpen Access PDFOpenAlex
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<scp>ABA</scp> importers <scp>ABCG17</scp> and <scp>ABCG18</scp> redundantly regulate seed size in <i>Arabidopsis</i> — Moran Anfang, Hamutal Bar, et al. · The Plant Journal (2025) | TGRS Research Map | TGRS