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Root branching toward water involves posttranslational modification of transcription factor ARF7

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Orosa-Puente Beatriz, Leftley Nicola, von Wangenheim Daniel, Banda Jason, Srivastava Anjil K., Hill Kristine, Truskina Jekaterina, Bhosale Rahul, Morris Emily, Srivastava Moumita, Kümpers Britta, Goh Tatsuaki, Fukaki Hidehiro, Vermeer Joop E. M., Vernoux Teva, Dinneny José R., French Andrew P., Bishopp Anthony, Sadanandom Ari, Bennett Malcolm J.,
Project Talking with the neighbours: Understanding spatial accommodation during plant development
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Original article (peer-reviewed)

Journal Science
Volume (Issue) 362(6421)
Page(s) 1407 - 1410
Title of proceedings Science
DOI 10.1126/science.aau3956

Abstract

Plants adapt to heterogeneous soil conditions by altering their root architecture. For example, roots branch when in contact with water by using the hydropatterning response. We report that hydropatterning is dependent on auxin response factor ARF7. This transcription factor induces asymmetric expression of its target gene LBD16 in lateral root founder cells. This differential expression pattern is regulated by posttranslational modification of ARF7 with the small ubiquitin-like modifier (SUMO) protein. SUMOylation negatively regulates ARF7 DNA binding activity. ARF7 SUMOylation is required to recruit the Aux/IAA (indole-3-acetic acid) repressor protein IAA3. Blocking ARF7 SUMOylation disrupts IAA3 recruitment and hydropatterning. We conclude that SUMO-dependent regulation of auxin response controls root branching pattern in response to water availability.
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