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Plant Hormones: Regulating Growth and Development

Understanding the Role of Plant Hormones in Plant Physiology

Introduction

  • Plants are immobile organisms without a nervous system
  • Plant hormones act as signaling molecules to regulate plant growth
  • Hormones are produced in low concentrations within the plant cells
  • Plant hormones determine the formation of stems, leaves, flowers, and fruits

Major Plant Hormones

  • Auxin
  • Cytokinin
  • Gibberellin
  • Abscisic acid
  • Brassinosteroid
  • Strigolactone
  • Jasmonic acid

Precursors of Plant Hormones

  • Auxin and ethylene derived from amino acids
  • Cytokinin, brassinosteroid, strigolactone, and jasmonic acid have iso compound precursors
  • Gibberellin has an alpha linolenic acid precursor

Functions of Plant Hormones

  • Auxin: Root initiation, xylem differentiation, and other functions
  • Abscisic acid: Seed dormancy, stomatal closure, and senescence
  • Cytokinin: Regulates cell division and shoot formation
  • Gibberellin: Seed germination, stem elongation, and pollen tube growth
  • Brassinosteroid: Cell elongation, cell division, and stress resistance
  • Strigolactone: Inhibition of shoot branching
  • Jasmonic acid: Defense against pests and pathogens

Conclusion

  • Plant hormones play a crucial role in regulating all physiological processes in plants
  • There are various other functions and signaling pathways mediated by these hormones
  • Understanding plant hormones is essential for optimizing plant growth, crop yield, and plant breeding strategies

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