Types of Auxins:
As discussed earlier auxins are of two types. They are classified into natural and artificial auxins based on their modes of production.
The auxins which are produced by the plants are known as natural auxins
The auxins that are artificially produced but have properties like the natural auxins are known as synthetic auxins.
Physiological effects of auxins:
Auxins are chemicals which induce a variety of physiological effects in the various parts of the plant body. Some of them are as follows:
- They induce the elongation of stems and coleoptiles, thereby stimulating them to grow
- They induce the formation roots at lower concentrations and inhibit their formations at higher concentrations.
- The auxins produced by the apical buds are involved in the suppression growth of lateral buds. This phenomenon is known as apical dominance.
- The external application of auxins induces seedless fruits (parthenocarpy) that are formed without fertilization. It is seen in plants such as watermelon, grapes, lime etc.
- These substances also prevent the formation of abscission layer.