Recruitment of myosin VIII towards plastid surfaces is root-cap specific and provides the evidence for actomyosin involvement in root osmosensing

Functional Plant Biology : FPB
Przemysław WojtaszekDieter Volkmann

Abstract

The existence of a cell wall-plasma membrane-cytoskeleton (WMC) continuum in plants has long been postulated. However, the individual molecules building such a continuum are still largely unknown. We test here the hypothesis that the integrin-based multiprotein complexes of animal cells have been replaced in plants with more dynamic entities. Using an experimental approach based on protoplast digestion mixtures, and utilising specific antibodies against Arabidopsis ATM1 myosin, we reveal possible roles played by plant-specific unconventional myosin VIII in the functioning of WMC continuum. We demonstrate rapid relocation (less than 5 min) of myosin VIII to statolith surfaces in maize root-cap cells, which is accompanied by the reorganisation of actin cytoskeleton. Upon prolonged stimulation, myosin VIII is also recruited to plasmodesmata and pit-fields of plasmolysing root cap statocytes. The osmotic stimulus is the major factor inducing relocation, but the cell wall-cytoskeleton interactions also play an important role. In addition, we demonstrate the tight association of myosin VIII with the surfaces of chloroplasts, and provide an indication for the differences in the mechanisms of plastid movement in roots and leaves of pla...Continue Reading

References

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Citations

Dec 21, 2006·Protoplasma·D Volkmann, F Baluska
Mar 6, 2009·Journal of Experimental Botany·Anna KasprowiczPrzemyslaw Wojtaszek
Sep 1, 2007·Plant Signaling & Behavior·Weronika Krzeszowiec, Halina Gabryś
Apr 9, 2008·Cell Motility and the Cytoskeleton·Amirali SattarzadehElmon Schmelzer
Aug 19, 2007·Biological Chemistry·Noriyuki Suetsugu, Masamitsu Wada
Sep 10, 2014·Journal of Integrative Plant Biology·Limor BuchnikEinat Sadot
Nov 30, 2005·The New Phytologist·Frantisek Baluska, Andrej Hlavacka
Mar 19, 2014·The Journal of Biological Chemistry·Takeshi HaraguchiKohji Ito
Mar 5, 2021·Frontiers in Plant Science·Min Diao, Shanjin Huang
Jan 9, 2008·BMC Plant Biology·Lior GolombEinat Sadot

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