Cell wall accumulation of fluorescent proteins derived from a trans-Golgi cisternal membrane marker and paramural bodies in interdigitated Arabidopsis leaf epidermal cells
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In most dicotyledonous plants, leaf epidermal pavement cells develop jigsaw puzzle-like shapes during cell expansion. The rapid growth and complicated cell shape of pavement cells is suggested to be achieved by targeted exocytosis that is coordinated with cytoskeletal rearrangement to provide plasma membrane and/or cell wall materials for lobe development during their morphogenesis. Therefore, visualization of membrane trafficking in leaf pavement cells should contribute an understanding of the mechanism of plant cell morphogenesis. To reveal membrane trafficking in pavement cells, we observed monomeric red fluorescent protein-tagged rat sialyl transferases, which are markers of trans-Golgi cisternal membranes, in the leaf epidermis of Arabidopsis thaliana. Quantitative fluorescence imaging techniques and immunoelectron microscopic observations revealed that accumulation of the red fluorescent protein occurred mostly in the curved regions of pavement cell borders and guard cell ends during leaf expansion. Transmission electron microscopy observations revealed that apoplastic vesicular membrane structures called paramural bodies were more frequent beneath the curved cell wall regions of interdigitated pavement cells and guard cell ends in young leaf epidermis. In addition, pharmacological studies showed that perturbations in membrane trafficking resulted in simple cell shapes. These results suggested possible heterogeneity of the curved regions of plasma membranes, implying a relationship with pavement cell morphogenesis.
KeywordsArabidopsis thaliana Exocytosis Microscopic image analysis Paramural body Pavement cell ST-mRFP
We thank Dr. Mamiko Sato of the Japan Women’s University and Ms. Mayumi Wakazaki of the RIKEN Center for Sustainable Resource Sciences for microscopic observation. We thank Dr. Haruko Ueda and Prof. Ikuko Hara-Nishimura of Kyoto University for kind comments. This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI to K.A. (26891006), N.K. (24770038), T.U. (24114003), K.T. (24687007 and 23657051), N.N. (23120526), S.H. (24114007 and 25291056), and T.H. (25711017).
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Conflict of interest
The authors declare that they have no conflict of interest.
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