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Related Experiment Videos

Modified alkaloid pattern in developing tobacco callus.

A F Tiburcio1, R Ingersoll, A W Galston

  • 1Department of Biology, Yale University, New Haven, CT 06511, USA.

Plant Science : an International Journal of Experimental Plant Biology
|January 1, 1985
PubMed
Summary
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Tobacco callus grown on modified Murashige-Skoog (MS) medium with organic acids shows significantly increased nornicotine and total alkaloid levels. This study highlights enhanced alkaloid accumulation in tobacco tissue cultures.

Area of Science:

  • Plant Biotechnology
  • Agricultural Science
  • Biochemistry

Background:

  • Nicotiana tabacum L. cv. Wisconsin-38 callus exhibits altered alkaloid profiles compared to the donor plant.
  • Understanding alkaloid biosynthesis and metabolism in plant tissue cultures is crucial for agricultural applications.

Purpose of the Study:

  • To investigate the impact of exogenous organic acids on alkaloid accumulation in tobacco callus.
  • To determine the metabolic fate of nicotine and the potential for nornicotine accumulation in tissue cultures.

Main Methods:

  • Culturing Nicotiana tabacum L. cv. Wisconsin-38 callus on modified Murashige-Skoog (MS) medium supplemented with Kao organic acids.
  • Analyzing alkaloid content (nornicotine, nicotine, total alkaloids) using chromatographic techniques.

Related Experiment Videos

  • Quantifying nornicotine/nicotine ratios during callus development.

    • Main Results:

    • Tobacco callus grown on MS medium with Kao organic acids demonstrated abnormally high levels of nornicotine and total alkaloids (up to 3.75% dry weight).
    • Evidence suggests nicotine is converted to nornicotine within the callus, with subsequent translocation to roots and medium.
    • Exogenous organic acids enhanced alkaloid levels but did not fully explain the increased nicotine demethylation.

    Conclusions:

    • Exogenous organic acids can significantly enhance total alkaloid content in tobacco callus cultures.
    • Endogenous nornicotine accumulation is a notable phenomenon in tobacco tissue cultures, offering potential for novel alkaloid production.