Arabidopsis Myosins XI1, XI2, and XIK Are Crucial for Gravity-Induced Bending of Inflorescence Stems

Frontiers in Plant Science
Kristiina TaltsH Paves

Abstract

Myosins and actin filaments in the actomyosin system act in concert in regulating cell structure and dynamics and are also assumed to contribute to plant gravitropic response. To investigate the role of the actomyosin system in the inflorescence stem gravitropism, we used single and multiple mutants affecting each of the 17 Arabidopsis myosins of class VIII and XI. We show that class XI but not class VIII myosins are required for stem gravitropism. Simultaneous loss of function of myosins XI1, XI2, and XIK leads to impaired gravitropic bending that is correlated with altered growth, stiffness, and insufficient sedimentation of gravity sensing amyloplasts in stem endodermal cells. The gravitropic defect of the corresponding triple mutant xi1 xi2 xik could be rescued by stable expression of the functional XIK:YFP in the mutant background, indicating a role of class XI myosins in this process. Altogether, our results emphasize the critical contributions of myosins XI in stem gravitropism of Arabidopsis.

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Citations

Feb 10, 2017·Proceedings of the National Academy of Sciences of the United States of America·Vitaly Citovsky, Bo Liu
Mar 27, 2018·Journal of Experimental Botany·Mohamad Abu-AbiedEinat Sadot
Mar 1, 2018·Annual Review of Plant Biology·Andreas Nebenführ, Ram Dixit
Mar 2, 2019·The Plant Journal : for Cell and Molecular Biology·Hana RakusováJiří Friml
Dec 13, 2018·Frontiers in Plant Science·Eve-Ly OjanguErkki Truve
Mar 3, 2020·Frontiers in Plant Science·Louise de BangElison B Blancaflor
Jan 9, 2018·Biochemical and Biophysical Research Communications·Zhongrui Duan, Motoki Tominaga
Apr 24, 2021·Science·Bruno MouliaOlivier Hamant

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Methods Mentioned

BETA
PCR
Assay
transgenic

Software Mentioned

qbase PLUS
GeNorm M
JMP
ImageJ
ImageJ ( Fiji )

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