What is apical dominance?
What is apical dominance?
Apical dominance is defined as an inhibitory control exercised by the apical portions of the shoot over the growth of the lateral buds below. From: Plant Growth and Development: Hormones and Environment, 2002.
What is apical dominance How is it caused?
Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. It is due to plant hormones produced in the tip of the shoot. Auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance.
What is apical dominance a level?
a condition where vertical growth supercedes lateral growth in a plant. this is controlled by auxins, where in high concentrations can inhibit growth but on the whole promote it. Removal of the apex can induce lateral growth.
What is the mechanism of apical dominance in plants?
Apical dominance occurs when the shoot apex inhibits the growth of lateral buds so that the plant may grow vertically. It is important for the plant to devote energy to growing upward so that it can get more light to undergo photosynthesis.
What is apical dominance PDF?
Apical dominance is a term used to describe the mechanism by which the apex of a shoot inhibits the outgrowth of secondary, or lateral, shoots. It is best demonstrated via decapitation (i.e. shoot tip removal), which leads to the development of lateral shoots.
What is apical dominance and bolting?
Auxin is a plant growth hormone. This hormone is responsible for the growth and elongation of the shoot. There is apical dominance observed in presence of auxin. This results in the growth of the central stem which is dominant and suppresses the growth of the lateral buds such phenomena is called as apical dominance.
What hormone is responsible for apical dominance?
Apical dominance is caused by the apical bud producing IAA (auxin) hormone in abundance. This auxin is transported basipetally from the apical bud. The auxin causes the lateral bud to remain dormant.
What is the role of auxin in apical dominance?
Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips.
What is apical dominance Class 12?
Apical dominance is a phenomenon in which central stem is dominant and growth of lateral buds is inhibited. It is due to plant hormones produced in the tip of the shoot. Auxin hormone is responsible for apical dominance and cytokinin hormone is responsible for breaking the apical dominance.
Which hormone is responsible for apical dominance?
IAA (auxin)
Apical dominance is caused by the apical bud producing IAA (auxin) hormone in abundance. This auxin is transported basipetally from the apical bud. The auxin causes the lateral bud to remain dormant.
How do auxins cause apical dominance?
The direct theory explains apical dominance as auxin synthesized in the shoot apex moves down the stem into buds and inhibits their growth. According to this theory, apically derived auxin inhibits buds from synthesizing their own auxin necessary for their growth.
What hormone controls apical dominance?
