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•  Flowering involves a change in gene expression in the shoot apex

Flowers are the reproductive organs of angiospermophytes (flowering plants) and develop from the shoot apex

  • Changes in gene expression trigger the enlargement of the shoot apical meristem
  • This tissue then differentiates to form the different flower structures – sepals, petals, stamen and pistil

The activation of genes responsible for flowering is influenced by abiotic factors – typically linked to the seasons

  • Flowering plants will typically come into bloom when a suitable pollinator is most abundant 
  • The most common trigger for a change in gene expression is day/night length (photoperiodism)

Flower Development – Scanning Electron Micrograph Timecourse