Actin polymerization drives polar growth in Arabidopsis root hair cells

Plant Signaling & Behavior
Luis Alfredo Bañuelos VazquezLuis Cárdenas Torres

Abstract

In plants, the actin cytoskeleton is a prime regulator of cell polarity, growth, and cytoplasmic streaming. Tip growth, as observed in root hairs, caulonema, and pollen tubes, is governed by many factors, including calcium gradients, exocytosis and endocytosis, reactive oxygen species, and the cytoskeleton. Several studies indicate that the polymerization of G-actin into F-actin also contributes to tip growth. The structure and function of F-actin within the apical dome is variable, ranging from a dense meshwork to sparse single filaments. The presence of multiple F-actin structures in the elongating apices of tip-growing cells suggests that this cytoskeletal array is tightly regulated. We recently reported that sublethal concentrations of fluorescently labeled cytochalasin could be used to visualize the distribution of microfilament plus ends using fluorescence microscopy, and found that the tip region of the growing root hair cells of a legume plant exhibits a clear response to the nodulation factors secreted by Rhizobium. (1) In this current work, we expanded our analysis using confocal microscopy and demonstrated the existence of highly dynamic fluorescent foci along Arabidopsis root hair cells. Furthermore, we show that th...Continue Reading

References

Dec 10, 1999·The Plant Cell·B C GibbonC J Staiger
Aug 22, 2001·Molecular Biology of the Cell·L VidaliP K Hepler
Oct 20, 2004·Current Opinion in Plant Biology·Urs FischerMarkus Grebe
Apr 26, 2005·Cell Motility and the Cytoskeleton·Luis CárdenasPeter K Hepler
Jul 22, 2005·European Journal of Cell Biology·Boris VoigtDiedrik Menzel
May 6, 2006·Annals of Botany·Xue HeYan Li
Jul 2, 2009·The Plant Journal : for Cell and Molecular Biology·Peng LiuJin-Xing Lin
Jan 22, 2014·Current Opinion in Plant Biology·Tijs Ketelaar

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Citations

Sep 2, 2017·Journal of Experimental Botany·Octavian O H Stephan
Sep 2, 2020·International Journal of Molecular Sciences·Yafei ChenNam-Soo Jwa
Mar 31, 2020·Photosynthesis Research·Arkajo Majumdar, Rup Kumar Kar

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