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Related Experiment Videos

Rice Phytochrome Is Biologically Active in Transgenic Tobacco.

S. A. Kay1, A. Nagatani, B. Keith

  • 1The Laboratory of Plant Molecular Biology, The Rockefeller University, New York, New York 10021.

The Plant Cell
|August 1, 1989
PubMed
Summary
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Overexpressing rice phytochrome in tobacco plants confirmed its biological activity. This study establishes a new system for analyzing phytochrome function in vivo.

Area of Science:

  • Plant molecular biology
  • Photobiology
  • Genetics

Background:

  • Phytochromes are crucial plant photoreceptors regulating various developmental processes.
  • Understanding phytochrome mechanisms in vivo is essential for plant science.
  • Previous studies lacked a robust system for in vivo functional analysis.

Purpose of the Study:

  • To investigate the in vivo mechanisms of phytochrome action.
  • To establish a transgenic system for functional analysis of rice phytochrome in tobacco.

Main Methods:

  • Overexpression of a full-length rice phytochrome cDNA in transgenic tobacco using the cauliflower mosaic virus 35S promoter.
  • Quantification of rice phytochrome mRNA and protein levels.
  • Immunoblot analysis using species-specific monoclonal antibodies.

Related Experiment Videos

  • Spectrophotometric analysis of photoreversibility.
  • Analysis of circadian Cab mRNA levels.

    • Main Results:

    • Transgenic tobacco plants accumulated significant amounts of rice phytochrome mRNA and protein.
    • The overexpressed rice phytochrome was spectrophotometrically detectable, assembled with chromophore, and was photoreversible.
    • Overproduction of rice phytochrome extended the free-running rhythm of Cab gene expression.

    Conclusions:

    • Rice phytochrome is biologically active in transgenic tobacco plants.
    • The developed transgenic system enables in vivo functional analysis of phytochrome.
    • This research provides insights into phytochrome-mediated gene regulation and plant development.