Published March 17, 2026
| Version v1
Journal article
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Independent roles of Arp2/3 complex and RIC4 protein in the control of epidermal cell shape
Authors/Creators
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1.
Charles University
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2.
Czech Academy of Sciences, Institute of Experimental Botany
Description
Our results show that RIC4 and the Arp2/3 complex function largely independently in the control of pavement cell shape. Genetic analyses indicate that they act in parallel rather than in one signaling cascade. We further demonstrate that RIC4 functions as a negative regulator of lobe formation, as its loss increases cell shape complexity whereas its overexpression increases cell circularity. RIC4-induced cell shape changes occur even in the absence of a functional Arp2/3 complex, excluding Arp2/3 as a downstream effector of RIC4 or ROP signaling. Finally, no correlation between cortical actin dynamics and cell shape phenotypes was detected, which suggests that global actin dynamics alone cannot explain pavement cell morphogenesis.
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Additional details
Funding
- Ministry of Education Youth and Sports
- TowArds Next GENeration Crops (TANGENC) CZ.02.01.01/00/22_008/0004581
- Ministry of Education Youth and Sports
- National Infrastructure for Biological and Medical Imaging LM2023050
- Ministry of Education Youth and Sports
- Modernization of e-INFRA CZ II EH23_016/0008329
- Czech Science Foundation
- The plasticity of protein-lipid interfaces in plant membranes perceived through evolutionary lenses GA22-35916S