ABA homeostasis and long-distance translocation are redundantly regulated by ABCG ABA importers.

Autor:	Zhang Y; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel., Kilambi HV; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel.; Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel., Liu J; Department of Biology, University of Fribourg, CH-1700 Fribourg, Switzerland., Bar H; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel., Lazary S; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel., Egbaria A; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel., Ripper D; ZMBP-Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany., Charrier L; Department of Biology, University of Fribourg, CH-1700 Fribourg, Switzerland., Belew ZM; DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg 1871, Denmark., Wulff N; DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg 1871, Denmark., Damodaran S; Department of Biology, Duke University, Durham, NC 27708, USA., Nour-Eldin HH; DynaMo Center, Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg 1871, Denmark., Aharoni A; Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot 7610001, Israel., Ragni L; ZMBP-Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany., Strader L; Department of Biology, Duke University, Durham, NC 27708, USA., Sade N; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel., Weinstain R; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel., Geisler M; Department of Biology, University of Fribourg, CH-1700 Fribourg, Switzerland., Shani E; School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, 6997801, Israel.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2021 Oct 22; Vol. 7 (43), pp. eabf6069. Date of Electronic Publication: 2021 Oct 20.
DOI:	10.1126/sciadv.abf6069
Abstrakt:	The effects of abscisic acid (ABA) on plant growth, development, and response to the environment depend on local ABA concentrations. Here, we show that in Arabidopsis , ABA homeostasis is regulated by two previously unknown ABA transporters. Adenosine triphosphate–binding cassette subfamily G member 17 (ABCG17) and ABCG18 are localized to the plasma membranes of leaf mesophyll and cortex cells to redundantly promote ABA import, leading to conjugated inactive ABA sinks, thus restricting stomatal closure. ABCG17 and ABCG18 double knockdown revealed that the transporters encoded by these genes not only limit stomatal aperture size, conductance, and transpiration while increasing water use efficiency but also control ABA translocation from the shoot to the root to regulate lateral root emergence. Under abiotic stress conditions, ABCG17 and ABCG18 are transcriptionally repressed, promoting active ABA movement and response. The transport mechanism mediated by ABCG17 and ABCG18 allows plants to maintain ABA homeostasis under normal growth conditions.
Databáze:	MEDLINE
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