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Related Experiment Videos

Sugarbeet sucrose synthase genes differ in organ-specific and developmental expression.

Darrin M Haagenson1, Karen L Klotz, J Mitchell McGrath

  • 1USDA-ARS, Northern Crop Science Laboratory, University Station, Fargo, ND 58105-5677, USA.

Journal of Plant Physiology
|December 20, 2005
PubMed
Summary

Two distinct sugarbeet sucrose synthase genes, SBSS1 and SBSS2, show varied expression patterns in different tissues and developmental stages. Their differing transcript and protein levels suggest complex regulation of sucrose synthase activity in plants.

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Area of Science:

  • Plant Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Sucrose synthase (SS) plays a crucial role in sucrose metabolism and plant development.
  • Understanding the differential expression of SS gene family members is vital for elucidating sucrose metabolism regulation.

Purpose of the Study:

  • To isolate and characterize a full-length sucrose synthase (SBSS2) cDNA clone from sugarbeet.
  • To compare the expression patterns of SBSS2 with a previously identified sugarbeet sucrose synthase gene (SBSS1).
  • To investigate the regulatory mechanisms governing sucrose synthase expression in sugarbeet.

Main Methods:

  • Isolation of a full-length SBSS2 cDNA clone from sugarbeet.
  • Comparative analysis of SBSS1 and SBSS2 gene sequences and deduced amino acid similarities.

Related Experiment Videos

  • Phylogenetic analysis to determine SS subclasses.
  • Quantitative analysis of organ-specific and developmental transcript and protein abundance for SBSS1 and SBSS2.

    • Main Results:

    • SBSS1 and SBSS2 share 80% amino acid similarity but represent distinct sucrose synthase subclasses.
    • Both genes exhibit high expression in roots and low expression in leaves.
    • SBSS2 transcript levels are higher than SBSS1 in young vegetative and floral tissues, but lower in mature tissues.
    • Protein expression patterns generally mirrored transcript levels, with a temporal lag in developmental changes.

    Conclusions:

    • Distinct organ-specific and developmental expression profiles of SBSS1 and SBSS2 highlight their specialized roles.
    • The observed differences in transcript and protein abundance suggest that both transcriptional and post-transcriptional regulation control sucrose synthase expression in sugarbeet.
    • Further research into these regulatory mechanisms can provide insights into optimizing sucrose metabolism in plants.