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Published on March 21, 2008; 10.1104/pp.108.118992

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Received March 11, 2008
Accepted March 17, 2008

Arabidopsis sucrose transporter AtSUC1 is important for pollen germination and sucrose-induced anthocyanin accumulation

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

Department of Plant Biology, University of Minnesota Twin Cities, 250 Biological Sciences Center, 1445 Gortner Ave., St. Paul, MN 55108

* Corresponding author; email: jward{at}umn.edu.

The 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-GFP 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.






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