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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.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...

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Comparative transcriptomic profiling of two tomato lines with different ascorbate content in the fruit.

Antonio Di Matteo1, Adriana Sacco, Rosalba De Stefano

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Tomato breeding aims to boost antioxidant content for health benefits. This study reveals that lower ascorbate levels in tomatoes are linked to increased oxidative metabolism, identifying key genes involved in its regulation.

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Area of Science:

  • Plant Science
  • Biochemistry
  • Genetics

Background:

  • Growing interest in tomato breeding for enhanced antioxidant content due to health benefits.
  • Ascorbate (vitamin C) is a key antioxidant in tomatoes, but its accumulation mechanisms are poorly understood.
  • Investigating genetic factors controlling ascorbate levels is crucial for improving tomato nutritional value.

Purpose of the Study:

  • To explore genetic mechanisms governing ascorbate biosynthesis and accumulation in tomato fruit.
  • To analyze the fruit transcriptome of a Solanum pennellii introgression line with reduced ascorbate levels.
  • To identify candidate genes influencing ascorbate pool size in tomatoes.

Main Methods:

  • Transcriptome profiling of the Solanum pennellii introgression line 10-1 and its cultivated parent.
  • Comparative analysis of gene expression related to antioxidant metabolism.
  • Identification of candidate genes involved in ascorbate regulation.

Main Results:

  • A lower fruit ascorbate level in the introgression line correlates with accelerated oxidative metabolism.
  • Increased antioxidant demand is associated with enhanced activity in mitochondria, peroxisomes, and cytoplasm.
  • Candidate genes involved in glycolysis, glyoxylate metabolism, and purine breakdown were identified.

Conclusions:

  • Accelerated oxidative metabolism contributes to reduced ascorbate levels in tomato fruit.
  • Glycolysis, glyoxylate metabolism, and purine breakdown pathways play significant roles in modulating ascorbate pool size.
  • This research provides insights into the genetic control of ascorbate accumulation for potential breeding applications.