Developmental Regulation of Intercellular Protein Trafficking through Plasmodesmata in Tobacco Leaf Epidermis

Oxford University Press (OUP) - Tập 118 Số 2 - Trang 373-385 - 1998
Asuka Itaya1, Young‐Min Woo1, Chikara Masuta2, Yīmíng Bào3, Richard S. Nelson3, Biao Ding1
1Department of Botany, Oklahoma State University, Stillwater, Oklahoma 74078 (A.I., Y.-M.W., B.D.).
2Plant Virology Laboratory, Faculty of Agriculture, Hokkaido University, Sapporo 060, Japan (C.M.)
3Plant Biology Division, The Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73402 (Y.B., R.S.N.)

Tóm tắt

Abstract Plasmodesmata mediate direct cell-to-cell communication in plants. One of their significant features is that primary plasmodesmata formed at the time of cytokinesis often undergo structural modifications, by the de novo addition of cytoplasmic strands across cell walls, to become complex secondary plasmodesmata during plant development. Whether such modifications allow plasmodesmata to gain special transport functions has been an outstanding issue in plant biology. Here we present data showing that the cucumber mosaic virus 3a movement protein (MP):green fluorescent protein (GFP) fusion was not targeted to primary plasmodesmata in the epidermis of young or mature leaves in transgenic tobacco (Nicotiana tabacum) plants constitutively expressing the3a:GFP fusion gene. Furthermore, the cucumber mosaic virus 3a MP:GFP fusion protein produced in planta by biolistic bombardment of the 3a:GFP fusion gene did not traffic between cells interconnected by primary plasmodesmata in the epidermis of a young leaf. In contrast, the 3a MP:GFP was targeted to complex secondary plasmodesmata and trafficked from cell to cell when a leaf reached a certain developmental stage. These data provide the first experimental evidence, to our knowledge, that primary and complex secondary plasmodesmata have different protein-trafficking functions and suggest that complex secondary plasmodesmata may be formed to traffic specific macromolecules that are important for certain stages of leaf development.

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Oxford University Press (OUP)

Tập 118 Số 2

373-385

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