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Related Experiment Videos

The maize root transcriptome by serial analysis of gene expression.

V Poroyko1, L G Hejlek, W G Spollen

  • 1Department of Plant Biology , University of Illinois, Urbana, Illinois 61801, USA.

Plant Physiology
|June 21, 2005
PubMed
Summary

Serial Analysis of Gene Expression revealed at least 22,000 expressed genes in maize root tips. Most transcripts were low abundance, with significant differences compared to other plant root transcriptomes.

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Area of Science:

  • Plant molecular biology
  • Genomics
  • Transcriptomics

Background:

  • Understanding the maize root transcriptome is crucial for crop improvement.
  • Previous studies have provided limited insights into the complexity of root gene expression.

Purpose of the Study:

  • To comprehensively define the number and relative abundance of transcripts in the maize root tip.
  • To identify novel transcripts and compare the maize root transcriptome with other plant species.

Main Methods:

  • Serial Analysis of Gene Expression (SAGE) was employed to profile gene expression.
  • Quantitative reverse transcription-PCR (qRT-PCR) was used for validation of selected transcripts.

Main Results:

  • A total of 161,320 tags identified a minimum of 14,850 genes, with an estimated 22,000 expressed genes in the maize root transcriptome.

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  • 68.8% of transcripts were low abundance (2-5 copies), while only 1% were highly abundant (100-1,200 copies).
  • 47% of identified tags represented novel maize transcripts not previously cataloged, and highly expressed transcripts showed substantial differences compared to Arabidopsis.

    • Conclusions:

    • The maize root tip exhibits a complex transcriptome with a significant number of novel genes.
    • Abundance levels and composition of transcripts vary considerably between maize and other plant root systems, highlighting species-specific adaptations.