Transcriptional regulation of PIN genes by FOUR LIPS and MYB88 during Arabidopsis root gravitropism

Hong-Zhe Wang, Ke-Zhen Yang, Jun-Jie Zou, Ling-Ling Zhu, Zi Dian Xie, Miyo Terao Morita, Masao Tasaka, Jiří Friml, Erich Grotewold, Tom Beeckman, Steffen Vanneste, Fred Sack and Jie Le ()
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Hong-Zhe Wang: Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan (Fragrant Hill), Haidian, Beijing 100093, China
Ke-Zhen Yang: Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan (Fragrant Hill), Haidian, Beijing 100093, China
Jun-Jie Zou: Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan (Fragrant Hill), Haidian, Beijing 100093, China
Ling-Ling Zhu: Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan (Fragrant Hill), Haidian, Beijing 100093, China
Zi Dian Xie: Center for Applied Plant Sciences, The Ohio State University
Miyo Terao Morita: Graduate School of Bioagricultural Sciences, Nagoya University
Masao Tasaka: Graduate School of Biological Sciences, Nara Institute of Science and Technology
Jiří Friml: Institute of Science and Technology of Austria
Erich Grotewold: Center for Applied Plant Sciences, The Ohio State University
Tom Beeckman: VIB
Steffen Vanneste: VIB
Fred Sack: University of British Columbia
Jie Le: Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan (Fragrant Hill), Haidian, Beijing 100093, China

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract PIN proteins are auxin export carriers that direct intercellular auxin flow and in turn regulate many aspects of plant growth and development including responses to environmental changes. The Arabidopsis R2R3-MYB transcription factor FOUR LIPS (FLP) and its paralogue MYB88 regulate terminal divisions during stomatal development, as well as female reproductive development and stress responses. Here we show that FLP and MYB88 act redundantly but differentially in regulating the transcription of PIN3 and PIN7 in gravity-sensing cells of primary and lateral roots. On the one hand, FLP is involved in responses to gravity stimulation in primary roots, whereas on the other, FLP and MYB88 function complementarily in establishing the gravitropic set-point angles of lateral roots. Our results support a model in which FLP and MYB88 expression specifically determines the temporal-spatial patterns of PIN3 and PIN7 transcription that are closely associated with their preferential functions during root responses to gravity.

Date: 2015
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DOI: 10.1038/ncomms9822

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