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J Integr Plant Biol
Epidermal restriction confers robustness to organ shapes
Lüwen Zhou1† *, Fei Du2† , Shiliang Feng1 , Jinrong Hu3,4, Shouqin Lü3,4, Mian Long3,4 and Yuling Jiao2,4
1Smart Materials and Advanced Structure Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China
2State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
3Key Laboratory of Microgravity (National Microgravity Laboratory), Center of Biomechanics and Bioengineering, and Beijing Key Laboratory
of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
4University of Chinese Academy of Sciences, Beijing 100049, China

These authors contributed equally to this work.
*Correspondence: Lüwen Zhou (zhoulvwen@nbu.edu.cn)
doi: 10.1111/jipb.12998
Abstract

The shape of comparable tissues and organs is consistent among individuals of a given species, but how this consistency or robustness is achieved remains an open question. The interaction between morphogenetic factors determines organ formation and subsequent shaping, which is ultimately a mechanical process. Using a computational approach, we show that the epidermal layer is essential for the robustness of organ geometry control. Specifically, proper epidermal restriction allows organ asymmetry maintenance, and the tensile epidermal layer is sufficient to suppress local variability in growth, leading to shape robustness. The model explains the enhanced organ shape variations in epidermal mutant plants. In addition, differences in the patterns of epidermal restriction may underlie the initial establishment of organ asymmetry. Our results show that epidermal restriction can answer the longstanding question of how cellular growth noise is averaged to produce precise organ shapes, and the findings also shed light on organ asymmetry establishment.

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Received: 17 June 2020      Accepted:    Online on:29 July 2020
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