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Transgenic Plants02:50

Transgenic Plants

Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Dicistronic binary vector system-A versatile tool for gene expression studies in cell cultures and plants.

Zahid Ali1, Heinz Martin Schumacher, Elke Heine-Dobbernack

  • 1German Collection of Microorganisms and Cell Cultures DSMZ GmbH, Braunschweig, Germany.

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Researchers developed novel dicistronic vectors for plant gene transfer, enabling simultaneous monitoring of target gene expression using a luciferase marker. This system improved salt tolerance in transgenic tobacco and pea plants.

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Area of Science:

  • Plant molecular biology
  • Genetic engineering
  • Biotechnology

Background:

  • Monitoring gene expression in plants is crucial for understanding gene function and developing improved crop varieties.
  • Traditional methods can be complex and time-consuming.
  • Dicistronic vectors offer a potential solution for simultaneous gene expression and monitoring.

Purpose of the Study:

  • To develop and validate novel dicistronic binary vector constructs for Agrobacterium-mediated gene transfer in plants.
  • To establish a system for monitoring target gene translational expression using a co-translated reporter gene.
  • To assess the utility of this system for physiological studies, specifically salt tolerance.

Main Methods:

  • Construction of dicistronic binary vectors based on pGreenII, incorporating a reporter gene (luciferase) linked via an internal ribosome entry site (IRES) to a target gene.
  • Validation using a mannopine synthase promoter (p-MAS) fused to a beta-glucuronidase (gus) gene and a firefly luciferase (luc) gene.
  • Testing of different IRES elements, with tobamo IRES showing highest activity in transient expression.
  • Replacement of the gus gene with a sodium antiporter gene (Atnhx1) for salt tolerance studies.
  • Comparative analysis of transgenic tobacco cell cultures and pea plants (Pisum sativum L.) for salt tolerance.

Main Results:

  • The developed dicistronic vectors successfully enabled translational expression monitoring of target genes in plants.
  • The tobamo IRES element demonstrated the highest activity among tested IRES elements for transient expression.
  • Transgenic tobacco cell cultures and pea plants expressing the Atnhx1 gene exhibited improved salt tolerance compared to wild-type counterparts.
  • A direct correlation was observed between luciferase gene expression (luminescence) and increased sodium chloride tolerance.

Conclusions:

  • Dicistronic binary vectors provide an effective tool for monitoring gene expression and facilitating physiological studies in plants.
  • The tobamo IRES element is a highly active component for co-translational expression systems in plants.
  • This technology holds promise for developing crops with enhanced stress tolerance, such as improved salt tolerance.