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. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism. Auxin also plays a role in maintaining apical dominance.

What plant shows apical dominance?

1.1. Apical dominance is genetically based and varies with species and cultivars. Some species show strong apical dominance [e.g., Helianthus annuus (sunflower), Tradescantia sp.]. Field-grown sunflower plants, 4 feet tall, may show little or no lateral branching in intact plants.

What is apical dominance which hormone control it?

For almost a century the plant hormone auxin has been central to theories on apical dominance, whereby the growing shoot tip suppresses the growth of the axillary buds below.

What is the role of auxin in plants?

Auxin, any of a group of plant hormones that regulate growth, particularly by stimulating cell elongation in stems. In addition to promoting normal growth in plant length, IAA and other auxins influence the growth of stems toward the light (phototropism) and against the force of gravity (geotropism).

What happens when apical dominance is lifted from a plant?

When the shoot is cut off, the lateral bud begins to lengthen which is mediated by a release of cytokinin. Once the apical dominance has been lifted from the plant, elongation and lateral growth is promoted and the lateral buds grow into new branches. When lateral bud formation prevents the plant from growing upward,…

Plant hormone helps the growth of plants.Auxin one among them is responsible for apical dominance.The meristamatic cells (fastly dividing cells responsible for growth)at the apical node produce auxin which in turn suppress the growth of lateral buds.This results in the elongation of apical node while the lateral branches are suppressed.

What kind of hormone does the apical bud produce?

The apical bud produces a plant hormone, auxin, that flows through the plant’s vascular system (phloem) down the stem, and inhibits the elongation of axillary buds which would otherwise produce new side shoots from the plant cells.

What happens in the apical bud of a plant?

The apical bud is where new plant growth and elongation occur. But that’s not all the apical bud does. The apical bud produces a plant hormone, auxin, that flows through the plant’s vascular system (phloem) down the stem, and inhibits the elongation of axillary buds which would otherwise produce new side shoots from the plant cells.