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  • The role of ethylene and abscisic acid is both positive and negative. Justify this statement.

The role of ethylene and abscisic acid is both positive and negative. Justify this statement.

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Ans. Both ethylene and abscisic acid have positive and negative effects.
Positive Effects of Ethylene:

  • Ethylene acts as a hormone which induces apical dominance and encourages horizontal growth
  • It interrupts the dormancy of seeds and buds
  • Ethylene aids in the initiation of the root
  • Ethylene also helps in the ripening of certain fruits

Negative Effects of Ethylene:

  • Ethylene causes abscission of leaves because it hastens the senescence of leaves
  • Ethylene delays longitudinal development in the plant
  • Ethylene extends the dormancy of lateral buds

Positive Effects of Abscisic Acid:

  • Helps in reduce water loss in the form of transpiration
  • Induces flowering in short-day plants
  • In certain plants such as Rosen, abscisic acid encourages parthenocarpic development as well as the rooting of stem-cutting
  • Helps plants form resistance to environmental stress
  • Promotes root initiation in certain plants

Negative Effects of Abscisic Acid:

  • Encourages the abscission of flowers and fruits and induces leaf senescence.
  • Inhibits and slows down the cambial activity
  • Retards the effect and functioning of growth hormones.
  • Promotes dormancy in seeds and
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