Abscisic acid is a negative regulator of root gravitropism in Arabidopsis thaliana |
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Authors: | Woong Han Hanma Zhang Myeong-Hyeon Wang |
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Institution: | a School of Biotechnology, Kangwon National University, Hyo-Ja 3 dong, Chuncheon, Gangwon 200-701, South Korea b Centre for Plant Sciences, Institute of Integrative and Comparative Biology (IICB), Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK |
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Abstract: | The plant hormone abscisic acid (ABA) plays a role in root gravitropism and has led to an intense debate over whether ABA acts similar to auxin by translating the gravitational signal into directional root growth. While tremendous advances have been made in the past two decades in establishing the role of auxin in root gravitropism, little progress has been made in characterizing the role of ABA in this response. In fact, roots of plants that have undetectable levels of ABA and that display a normal gravitropic response have raised some serious doubts about whether ABA plays any role in root gravitropism. Here, we show strong evidence that ABA plays a role opposite to that of auxin and that it is a negative regulator of the gravitropic response of Arabidopsis roots. |
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Keywords: | Abscisic acid (ABA) Auxin Root gravitropism Naphthyl phthalamic acid (NPA) β-Glucuronidase (GUS) |
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