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Related Experiment Videos

Sugars regulate sucrose transporter gene expression in citrus.

Chun Yao Li1, Jian Xin Shi, David Weiss

  • 1The Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agricultural, Food, and Environmental Quality Sciences, The Hebrew University of Jerusalem, 76100, Rehovot, Israel.

Biochemical and Biophysical Research Communications
|June 14, 2003
PubMed
Summary
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Two citrus sucrose transporter genes, CitSUT1 and CitSUT2, were identified. CitSUT1 expression is regulated by sugars via a hexokinase pathway, while CitSUT2 is not, suggesting distinct roles in plant sugar transport.

Area of Science:

  • Plant Molecular Biology
  • Plant Physiology
  • Biochemistry

Background:

  • Sucrose transporters are crucial for phloem loading and transport in plants.
  • Understanding citrus sucrose transporter function is vital for crop improvement and yield optimization.

Purpose of the Study:

  • To isolate and characterize novel sucrose transporter cDNAs from citrus plants.
  • To investigate the regulatory mechanisms and physiological roles of identified citrus sucrose transporters.

Main Methods:

  • Isolation and sequencing of two sucrose transporter cDNAs, designated CitSUT1 and CitSUT2.
  • Analysis of protein sequences for structural and functional similarities to known sucrose transporters.
  • Expression analysis of CitSUT1 and CitSUT2 in response to exogenous sugars and in different plant tissues.

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Main Results:

  • CitSUT1 and CitSUT2 encode putative proteins of 528 and 607 amino acids, respectively, with high similarity to other plant sucrose transporters.
  • CitSUT1 expression in mature leaf discs is repressed by sucrose and glucose analogs (2-deoxyglucose) via a hexokinase-mediated pathway, but not by 3-O-methylglucose.
  • CitSUT2 expression is unaffected by exogenous sugars and shows stronger expression in sink tissues, whereas CitSUT1 is highly expressed in source tissues.

Conclusions:

  • Citrus possesses at least two distinct sucrose transporters with potentially different roles in sugar transport and metabolism.
  • CitSUT1 is likely involved in phloem loading and its expression is subject to sugar-dependent regulation.
  • CitSUT2 may play a role in sugar import into sink organs, with a regulatory mechanism distinct from CitSUT1.