Root branching under high salinity requires auxin-independent modulation of LATERAL ORGAN BOUNDARY DOMAIN 16 function

Yanxia Zhang*, Yiyun Li, Thijs De zeeuw, Kilian Duijts, Dorota Kawa, Jasper Lamers, Kristina Munzert, Hongfei Li, Yutao Zou, Jessica Meyer, Jinxuan Yan, Francel Verstappen, Yixuan Wang, Tom Gijsberts, Jielin Wang, Nora Gigli-Bisceglia, Timo Engelsdorf, Aalt van Dijk, Christa Testerink*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Salinity stress constrains lateral root (LR) growth and severely affects plant growth. Auxin signaling regulates LR formation, but the molecular mechanism by which salinity affects root auxin signaling and whether salt induces other pathways that regulate LR development remains unknown. In Arabidopsis thaliana, the auxin-regulated transcription factor LATERAL ORGAN BOUNDARY DOMAIN 16 (LBD16) is an essential player in LR development under control conditions. Here, we show that under high-salt conditions, an alternative pathway regulates LBD16 expression. Salt represses auxin signaling but, in parallel, activates ZINC FINGER OF ARABIDOPSIS THALIANA 6 (ZAT6), a transcriptional activator of LBD16. ZAT6 activates LBD16 expression, thus contributing to downstream cell wall remodeling and promoting LR development under high-salt conditions. Our study thus shows that the integration of auxin-dependent repressive and salt-activated auxin-independent pathways converging on LBD16 modulates root branching under high-salt conditions.
Original languageEnglish
Article numberkoad317
Pages (from-to)899-918
JournalThe Plant Cell
Volume36
Issue number4
Early online date8 Dec 2023
DOIs
Publication statusPublished - 2024

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