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First published online March 21, 2008; 10.1104/pp.108.118992

Plant Physiology 147:92-100 (2008)
© 2008 American Society of Plant Biologists

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BIOCHEMICAL PROCESSES AND MACROMOLECULAR STRUCTURES

Arabidopsis Sucrose Transporter AtSUC1 Is Important for Pollen Germination and Sucrose-Induced Anthocyanin Accumulation1,[OA]

Alicia B. Sivitz2, Anke Reinders and John M. Ward*

Department of Plant Biology, University of Minnesota Twin Cities, St. Paul, Minnesota 55108

The Arabidopsis (Arabidopsis thaliana) sucrose transporter AtSUC1 (At1g71880) is highly expressed in pollen; however, its function has remained unknown. Here, we show that suc1 mutant pollen is defective in vivo, as evidenced by segregation distortion, and also has low rates of germination in vitro. AtSUC1-green fluorescent protein was localized to the plasma membrane in pollen tubes. AtSUC1 is also expressed in roots and external application of sucrose increased AtSUC1 expression in roots. AtSUC1 is important for sucrose-dependent signaling leading to anthocyanin accumulation in seedlings. suc1 mutants accumulated less anthocyanins in response to exogenous sucrose or maltose and microarray analysis revealed reduced expression of many genes important for anthocyanin biosynthesis. The results indicate that AtSUC1 is important for sugar signaling in vegetative tissue and for normal male gametophyte function.

1 This work was supported by the Department of Energy (grant no. FG02–07ER15886 to J.M.W.), by a Bernard and Jean Phinney Graduate Fellowship in Plant Molecular Biology (to A.B.S.), and by a University of Minnesota Graduate School Doctoral Dissertation Fellowship (to A.B.S.).

2 Present address: Department of Biology, University of Washington, 544 Hitchcock Hall, Seattle, WA 98195–1800.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: John M. Ward (jward{at}tc.umn.edu).

[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.108.118992

* Corresponding author; e-mail jward{at}tc.umn.edu.

Received March 11, 2008; accepted March 17, 2008; published March 21, 2008.


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