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A Previously Unknown Maltose Transporter Essential for Starch Degradation in Leaves
Open accessAbstract
A previously unknown maltose transporter is essential for the conversion of starch to sucrose in Arabidopsis leaves at night. The transporter was identified by isolating two allelic mutants with high starch levels and very high maltose, an intermediate of starch breakdown. The mutations affect a gene of previously unknown function, MEX1 . We show that MEX1is a maltose transporter that is unrelated to other sugar transporters. The severe mex1 phenotype demonstrates that MEX1is the predominant route of carbohydrate export from chloroplasts at night. Homologous genes in plants including rice and potato indicate that maltose export is of widespread significance.
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Cited by
Starch: its metabolism, evolution, and biotechnological modification in plants
Zeeman, S. C., Kossmann, J., & Smith, A. M. (2010) · Annual Review of Plant Biology · doi:10.1146/annurev-arplant-042809-112301 · Cited by 1,095
Self-citationBorland, A. M., Griffiths, H., Hartwell, J., & Smith, J. A. C. (2009) · Journal of Experimental Botany · doi:10.1093/jxb/erp118 · Cited by 371
Osorio, S., Alba, R., Damasceno, C. M. B., Lopez-Casado, G., Lohse, M., Zanor, M. I., Tohge, T., Usadel, B., Rose, J. K. C., Fei, Z., et al. (2011) · Plant Physiology · doi:10.1104/pp.111.175463 · Cited by 334
Starch Biosynthesis in the Developing Endosperms of Grasses and Cereals
Tetlow, I. J., & Emes, M. J. (2017) · Agronomy · doi:10.3390/agronomy7040081 · Cited by 112
Metadata
- Authors
- Niittylä, T., Messerli, G., Trevisan, M., Chen, J., Smith, A. M., & Zeeman, S. C.
- Venue
- Science
- Published
- 2004-01-02
- Volume
- 303
- Issue
- 5654
- Pages
- 87-89
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1994745273
- Cited by
- 482
- References
- 0
- FWCI
- 39.36
- Type
- journal article
- Language
- en
- Open access
- green
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- Niittylä, T., Messerli, G., Trevisan, M., Chen, J., Smith, A. M., & Zeeman, S. C. (2004). A Previously Unknown Maltose Transporter Essential for Starch Degradation in Leaves. Science. https://doi.org/10.1126/science.1091811
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