Effective carbon partitioning driven by exotic phloem-specific regulatory elements fused to the Arabidopsis thaliana AtSUC2 sucrose-proton symporter gene

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This article discusses the effect and overall importance of the Arabidopsis thaliana AtSUC2 sucrose-proton symporter gene on carbon partitioning and plant growth.

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13 p.

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Srivastava, Avinash C.; Ganesan, Savita; Ismail, Ihab O. & Ayre, Brian G. January 20, 2009.

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This article discusses the effect and overall importance of the Arabidopsis thaliana AtSUC2 sucrose-proton symporter gene on carbon partitioning and plant growth.

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13 p.

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Abstract: Background: AtSUC2 (At1g22710) from Arabidopsis thaliana encodes a phloem-localized sucrose/proton symporter required for efficient photoassimilate transport from source tissues to sink tissues. AtSUC2 plays a key role in coordinating the demands of sink tissues with the output capacity of source leaves, and in maintaining phloem hydrostatic pressure during changes in plant-water balance. Expression and activity are regulated, both positively and negatively, by developmental (sink or source transition) and environmental cues, including light, diurnal changes, photoassimilate levels, turgor pressure, drought and osmotic stress, and hormones. Results: To assess the importance of this regulation to whole-plant growth and carbon partitioning, AtSUC2 cDNA was expressed from two exotic, phloem-specific promoters in a mutant background debilitated for AtSUC2 function. The first was a promoter element from Commelina Yellow Mottle Virus (CoYMV), and the second was the rolc promoter from Agrobacterium rhizogenes. CoYMVp::AtSUC2 cDNA restored growth and carbon partitioning to near wild-type levels, whereas plants harboring rolCp::AtSUC2 cDNA showed only partial complementation. Conclusion: Expressing AtSUC2 cDNA from exotic, phloem-specific promoters argues that strong, phloem-localized expression is sufficient for efficient transport. Expressing AtSUC2 from promoters that foster efficient phloem transport but are subject to regulatory cascades different from the endogenous sucrose/proton symporter genes has implications for biotechnology.

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  • BMC Plant Biology, 2009, London: BioMed Central Ltd.

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  • Publication Title: BMC Plant Biology
  • Volume: 9
  • Issue: 7
  • Pages: 13
  • Peer Reviewed: Yes

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UNT Scholarly Works

The Scholarly Works Collection is home to materials from the University of North Texas community's research, creative, and scholarly activities and serves as UNT's Open Access Repository. It brings together articles, papers, artwork, music, research data, reports, presentations, and other scholarly and creative products representing the expertise in our university community. Access to some items in this collection may be restricted.

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  • January 20, 2009

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  • April 2, 2012, 4:46 p.m.

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  • July 18, 2013, 12:52 p.m.

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Srivastava, Avinash C.; Ganesan, Savita; Ismail, Ihab O. & Ayre, Brian G. Effective carbon partitioning driven by exotic phloem-specific regulatory elements fused to the Arabidopsis thaliana AtSUC2 sucrose-proton symporter gene, article, January 20, 2009; [London, United Kingdom]. (digital.library.unt.edu/ark:/67531/metadc78288/: accessed April 29, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.