F-Actin-Dependent Endocytosis of Cell Wall Pectins in Meristematic Root Cells. Insights from Brefeldin A-Induced Compartments

Author:

Baluška František1,Hlavacka Andrej1,Šamaj Jozef2,Palme Klaus3,Robinson David G.4,Matoh Toru5,McCurdy David W.6,Menzel Diedrik1,Volkmann Dieter1

Affiliation:

1. Plant Cell Biology, Institute of Botany, University of Bonn, Kirschallee 1, D–53115 Bonn, Germany (F.B., A.H., D.M., D.V.);

2. Institute of Plant Genetics and Biotechnology, Slovak Academy of Sciences, Akademická 2, SK–95007 Nitra, Slovakia (J.Š.);

3. Max-Delbrück-Laboratorium in der Max-Planck-Gesellschaft, D–50829 Köln, Germany (K.P.);

4. HIP Zellbiologie, University of Heidelberg, Im Neuenheimer Feld 230, D–69120 Heidelberg, Germany (D.G.R.);

5. Laboratory of Plant Nutrition, Kyoto University, Kyoto 606–01, Japan (T.M.); and

6. School of Environmental and Life Sciences, The University of Newcastle, Newcastle, New South Wales 2308, Australia (D.W.M.)

Abstract

Abstract Brefeldin A (BFA) inhibits exocytosis but allows endocytosis, making it a valuable agent to identify molecules that recycle at cell peripheries. In plants, formation of large intracellular compartments in response to BFA treatment is a unique feature of some, but not all, cells. Here, we have analyzed assembly and distribution of BFA compartments in development- and tissue-specific contexts of growing maize (Zea mays) root apices. Surprisingly, these unique compartments formed only in meristematic cells of the root body. On the other hand, BFA compartments were absent from secretory cells of root cap periphery, metaxylem cells, and most elongating cells, all of which are active in exocytosis. We report that cell wall pectin epitopes counting rhamnogalacturonan II dimers cross-linked by borate diol diester, partially esterified (up to 40%) homogalacturonan pectins, and (1→4)-β-d-galactan side chains of rhamnogalacturonan I were internalized into BFA compartments. In contrast, Golgi-derived secretory (esterified up to 80%) homogalacturonan pectins localized to the cytoplasm in control cells and did not accumulate within characteristic BFA compartments. Latrunculin B-mediated depolymerization of F-actin inhibited internalization and accumulation of cell wall pectins within intracellular BFA compartments. Importantly, cold treatment and protoplasting prevented internalization of wall pectins into root cells upon BFA treatment. These observations suggest that cell wall pectins of meristematic maize root cells undergo rapid endocytosis in an F-actin-dependent manner.

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Genetics,Physiology

Reference58 articles.

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