Cell specific expression of three genes involved in plasma membrane sucrose transport in developingVicia faba seed |
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Authors: | G N Harrington V R Franceschi C E Offler J W Patrick M Tegeder W B Frommer J F Harper W D Hitz |
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Institution: | (1) Department of Biological Sciences, The University of Newcastle, 2308 Newcastle, NSW, Australia;(2) Department of Botany, Washington State University, Pullman, Washington;(3) Institut für Botanik, Eberhard-Karls-Universität, Tübingen;(4) Department of Cell Biology, The Scripps Research Institute, La Jolla, California;(5) Central Research and Development Department, E.I. Dupont de Nemours and Co., Experimental Station, Wilmington, Delaware |
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Abstract: | Summary In developing seeds ofVicia faba, transfer cells line the inner surface of the seed coat and the juxtaposed epidermal surface of the cotyledons. Circumstantial evidence, derived from anatomical and physiological studies, indicates that these cells are the likely sites of sucrose efflux to, and influx from, the seed apoplasm, respectively. In this study, expression of an H+/sucrose symporter-gene was found to be localised to the epidermal-transfer cell complexes of the cotyledons. The sucrose binding protein (SBP) gene was expressed in these cells as well as in the thin-walled parenchyma transfer cells of the seed coat. SBP was immunolocalised exclusively to the plasma membranes located in the wall ingrowth regions of the transfer cells. In addition, a plasma membrane H+-ATPase was most abundant in the wall ingrowth regions with decreasing levels of expression at increasing distance from the transfer cell layers. The observed co-localisation of high densities of a plasma membrane H+-ATPase and sucrose transport proteins to the wall ingrowths of the seed coat and cotyledon transfer cells provides strong evidence that these regions are the principal sites of facilitated membrane transport of sucrose to and from the seed apoplasm.Abbreviations BCIP
5-bromo-4-chloro-3-indolyl phosphate
- DIG
digoxigenin
- H+-ATPase
plasma membrane H+-translocating adenosine triphosphatase
- Ig
immunoglobulin
- LeSUT1
tomato H+/sucrose symporter
- SBP
sucrose binding protein |
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Keywords: | Gene expression Plasma membrane transport Seed Sucrose efflux/influx Transfer cells Vicia faba |
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