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CARBOHYDRATE-MODULATED GENE EXPRESSION IN PLANTS.

K. E. Koch1

  • 1Plant Molecular and Cellular Biology Program, Horticultural Sciences Department, University of Florida, Gainesville, Florida 32611.

Annual Review of Plant Physiology and Plant Molecular Biology
|June 1, 1996
PubMed
Summary
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A Similar Dichotomy of Sugar Modulation and Developmental Expression Affects Both Paths of Sucrose Metabolism: Evidence from a Maize Invertase Gene Family.

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Plant gene expression adapts to sugar levels, influencing photosynthesis, storage, and resource distribution. This ancient system aids cellular adjustment and plant acclimation to environmental changes.

Area of Science:

  • Plant molecular biology
  • Plant physiology
  • Biochemistry

Background:

  • Plant gene responses to carbohydrate availability are complex, involving gene induction, repression, or minimal changes.
  • Sugar-sensitive plant genes are part of an ancient nutrient-sensing system, also crucial for resource allocation in multicellular plants.

Purpose of the Study:

  • To review molecular and whole-plant level insights into plant gene responses to carbohydrate status.
  • To explore emerging models for sensing and transducing carbohydrate signals in plants.

Main Methods:

  • Literature review of molecular and physiological studies on plant carbohydrate signaling.
  • Analysis of gene expression patterns under varying carbohydrate conditions.
  • Examination of models for carbohydrate signal transduction pathways.

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Main Results:

  • Carbohydrate depletion upregulates genes for photosynthesis, remobilization, and export, while downregulating storage and utilization genes.
  • Abundant sugar levels induce opposite effects, repressing certain genes and inducing others.
  • Carbohydrate-responsive gene expression is sensitive to environmental and developmental signals, facilitating plant acclimation.

Conclusions:

  • Plant gene regulation by carbohydrates is a fundamental mechanism for cellular adjustment and resource partitioning.
  • Understanding these pathways is key to comprehending plant acclimation and adaptation to diverse conditions.