QS Study

The physiological effects of Auxin:

The primary physiological effect of auxin in plants is to rouse the elongation of cells in the shoot. A very general example of this can be observed in phototropic curvatures where the unilateral light unevenly distributes the auxin in the stem tip. Other Physiological effects:

  • Cells increase in length with the effect of auxin.
  • Auxin helps plants to absorb more water.
  • Auxin creates dominance in the growth of apical buds, called apical dominance. Apical buds grow rapidly, because of the presence of auxin at a large amount in the tropical regions.
  • Auxin initiates the formation of roots.
  • Auxin helps in the formation of fruits without pollination and fertilization.
  • Auxin increases the rate of respiration.
  • Auxin helps in the formation of seedless fruits.
  • Auxins stimulate cell division in cam­bium and also in the primary meristems.
  • Auxins induce root formation at low concentrations. This is made use of by horticulturists to induce root formations in stem cut­tings.
  • Auxin prevents leaf fall by suppressing the formation of abscission layer.