Which plant hormone promotes seed dormancy during environmental stress?

Abscisic acid promotes seed dormancy during environmental stress.

Abscisic acid

Abscisic acid is the growth inhibitor hormone in plants. Abscisic acid stimulates the growth and development of the root system, including adventitious roots of the hypocotyl, the formation and growth of the lateral shoots of the cotyledonary node.  Plants produce and accumulate increased amounts of ABA in the guard cells, which induces stomatal closure to conserve water.

  • ABA is an isoprenoid phytohormone, which regulates various physiological processes ranging from stomatal openings to protein storage and adaptation to many stresses like drought, salt, and cold stresses.
  • ABA is an important mediator of drought, salt, and osmotic stress.

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