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SUT2, a putative sucrose sensor in sieve elements.

L Barker1, C Kühn, A Weise

  • 1Plant Physiology, Zentrum für Molekularbiologie der Pflanzen (ZMBP), Universität Tübingen, Germany.

The Plant Cell
|July 19, 2000
PubMed
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A novel sucrose transporter, SUT2, acts as a sugar sensor in plant sieve elements. It colocalizes with other sucrose transporters and may regulate sugar transport, impacting tuber yield.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Sucrose uptake in plant leaves involves both high- and low-affinity transport mechanisms.
  • Several sucrose transporter (SUT) genes have been identified, with SUT1 and SUT4 playing roles in phloem loading and transport in solanaceous species.

Purpose of the Study:

  • To identify and characterize novel sucrose transporter-like proteins in tomato and Arabidopsis.
  • To investigate the localization, expression patterns, and potential function of the newly identified SUT2 protein.

Main Methods:

  • Bioinformatic analysis to identify SUT2 based on structural resemblance to yeast sugar sensors.
  • Localization studies using microscopy to determine SUT protein colocalization in sieve elements.
  • Gene expression analysis and sucrose inducibility assays.

Related Experiment Videos

  • Genetic mapping of the SUT2 gene in potato.

    • Main Results:

    • A new sucrose transporter family member, SUT2, was identified in tomato and Arabidopsis, featuring extended cytoplasmic domains similar to yeast sugar sensors.
    • LeSUT2 protein was found to colocalize with SUT1 and SUT4 in the enucleate sieve elements of tomato petioles.
    • SUT2 expression is higher in sink than in source leaves and is induced by sucrose, contrasting with LeSUT1.
    • The SUT2 gene in potato is genetically linked to a major quantitative trait locus for tuber starch content and yield.

    Conclusions:

    • SUT2 represents a putative sugar sensor protein in plants, distinct from characterized sucrose transporters.
    • The colocalization of SUT2 with other SUTs suggests coordinated regulation of sucrose transport.
    • SUT2's potential role in regulating low- and high-affinity sucrose transport may have implications for crop yield, particularly in potato.