Skip to main content
Research article - Peer-reviewed, 2021

External Mechanical Cues Reveal a Katanin-Independent Mechanism behind Auxin-Mediated Tissue Bending in Plants

Baral, Anirban; Aryal, Bibek; Jonsson, Kristoffer; Morris, Emily; Demes, Elsa; Takatani, Shogo; Verger, Stephane; Xu, Tongda; Bennett, Malcolm; Hamant, Olivier; Bhalerao, Rishikesh P.

Abstract

Tissue folding is a central building block of plant and animal morphogenesis. In dicotyledonous plants, hypocotyl folds to form hooks after seedling germination that protects their aerial stem cell niche during emergence from soil. Auxin response factors and auxin transport are reported to play a key role in this process. Here, we show that the microtubule-severing enzyme katanin contributes to hook formation. However, by exposing hypocotyls to external mechanical cues mimicking the natural soil environment, we reveal that auxin response factors ARF7/ARF19, auxin influx carriers, and katanin are dispensable for apical hook formation, indicating that these factors primarily play the role of catalyzers of tissue bending in the absence of external mechanical cues. Instead, our results reveal the key roles of the non-canonical TMK-mediated auxin pathway, PIN efflux carriers, and cellulose microfibrils as components of the core pathway behind hook formation in the presence or absence of external mechanical cues.

Published in

Developmental Cell
2021, volume: 56, number: 1, pages: 67-+
Publisher: CELL PRESS

Authors' information

Baral, Anirban
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Beijing Forestry University
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Morris, Emily
University of Oxford
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Takatani, Shogo
Universite Claude Bernard Lyon 1
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Xu, Tongda
Fujian Agriculture and Forestry University
Bennett, Malcolm
University of Nottingham
Hamant, Olivier
Universite Claude Bernard Lyon 1
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology

UKÄ Subject classification

Developmental Biology
Plant Biotechnology

Publication Identifiers

DOI: https://doi.org/10.1016/j.devcel.2020.12.008

URI (permanent link to this page)

https://res.slu.se/id/publ/110438