How does auxin regulate 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 is axillary shoot system?

An axillary bud, the precursor of a branch or lateral shoot, is formed at the junction between a leaf and the stem. The shoot apex tends to inhibit outgrowth of axillary buds, a phenomenon called apical dominance. Removal of the shoot tip leads to growth of these buds to produce lateral shoots.

What are the hormones responsible for plant growth promoting auxiliary bud growth and apical dominance?

Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation.

Does apical dominance control side branching?

Whereas apical dominance describes the control by the shoot tip over axillary buds, the term shoot branching can be used more widely to describe plant branching, regardless of the cause or form of control.

What are the functions of the shoot system?

By contrast, the plant shoot system refers to the plant parts located above ground. The main function of the shoot system is to transport water and nutrients to various parts of the plant. Other functions include growth, reproduction, nutrient storage, and photosynthesis.

What are the names and functions of the plant shoot system?

Vascular plants have two distinct organ systems: a shoot system, and a root system. The shoot system consists stems, leaves, and the reproductive parts of the plant (flowers and fruits). The shoot system generally grows above ground, where it absorbs the light needed for photosynthesis.

Which of the following is responsible for the formation of an embryonic shoot called axillary bud?

So, the correct answer is ‘Apical meristem’.

How does apical dominance affect branching?

In botany, apical dominance is the phenomenon whereby the main, central stem of the plant is dominant over (i.e., grows more strongly than) other side stems; on a branch the main stem of the branch is further dominant over its own side twigs.

What is the mechanism of apical dominance in plants?

It’s the phenomenon in plants where a main shoot dominates and inhibits the outgrowth of other shoots. In plants with strong apical dominance, main shoot tip damage or shoot tip loss, caused by pruning or herbivory, leads to the outgrowth of compact embryonic shoots (axillary buds) into branches.

What is the difference between apical dominance and apical control?

Similarly Wilson (1990) states, ”apical dominance refers to whether lateral buds grow out and apical control refers to the relative length and orientation of the lateral axes that do grow out” (p. 53).

What is the function of the shoot system in a flower?

What are the functions of root and shoot system?

The main function of the root system is to absorb water and minerals from the soil while the main function of the shoot system is to produce food by photosynthesis.

What are the main parts of shoot?

The stem, leaves, buds, and flowers make up the shoot. The vegetative portions are the base, stem, and leaves, whereas the reproductive parts are the flowers, fruits, and seeds. Continue reading to learn more about the shoot system and its purposes.

Which is responsible for formation of embryonic shoot?

The shoot meristem, a stem-cell-containing tissue initiated during plant embryogenesis, is responsible for continuous shoot organ production in postembryonic development.

What is auxiliary and terminal bud?

Note: The terminal bud develops from the tip of the stem and the axillary buds are produced from the leaf node of the stem. As a consequence, both terminal and axillary buds emerge from the apex. The terminal bud causes the apical bud to become dormant through the process of apical dominance.

Which hormone controls apical dominance in plants?

phytohormone-auxin
Solution : Apical dominance is the phenomenon of suppression of growth in nearby lateral buds by the presence of apical bud. Removal of apical bud causes sprouting of lateral buds. The phytohormone-auxin controls apical dominance.

What maintains apical dominance?

The continual flow of auxin from the shoot tip is thought to maintain apical dominance by preventing auxin flow from axillary buds. In the second messenger theory, apically derived auxin inhibits axillary bud growth indirectly by inhibiting cytokinin production and/or promoting strigolactone synthesis (4, 11, 12).

What is shoot system and its function?

What is the function of the Shoot System? Ans: Shoot system is called the production unit of the plant. The shoot system consists of stem, leaves, flower, fruit and seed. Shoot System is responsible for Photosynthesis and Reproduction.