Apical dominance is a phenomenon seen in plants in which a central stem becomes dominant, growing faster than other stems and secreting hormones which inhibit stem growth below the terminal bud at the end of the apical stem. A number of plants and trees exhibitapical dominance, with fir trees being a classic example. The distinctive triangular shape of the fir tree is the result of apical dominance, with the trunk of the tree being the apical stem.
There are a number of reasons why plants adopt apical dominance. By pouring energy into a central stem, plants can achieve height quickly, which increases their access to nutrients and also helps the plant block competition. This phenomenon is also exhibited in rooting systems, where apical dominance results in a long, very strong taproot which keeps the plant firmly anchored in place, unlike a fibrous root system, which can make the plant unstable in some soils.
The terminal bud on the apical stem secretes the hormone auxin, which blocks growth in lower stems. If it is removed or the circulation is inhibited, other stems below will start to shoot up, and one may in turn become apical. Apical dominance can also be seen in branches; branches which grow from the main stem will in turn inhibit the growth of smaller branches from stems along their length.
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Lateral buds develop generally when apical dominance is terminated
apical dominance
Auxins are chemicals exist in plants to stimulate growth. When sunlight hits one side of the stem of a plant, the auxins move away and down from the sunlight. This causes the 'dark' side of the stem to grow faster than the 'lighted' side, which causes the stem to lean towards the source of the light.
an apical cell is the top layer of the epidermis.
i want a best project on apical dominance
Apical dominance is a concentration of growth at the tip of a plant shoot, where a terminal bud partially inhibits axillary bud growth by using hormones.
Authority or control
Thimann and Skoog in 1934
auxin
Upright stem with decussate arrangement of leaves
apical dominance
Apical buds are those located at the end of stems; lateral buds are located in the leaf axils along the length of the stems. Apical dominance occurs when a branch tends to get longer and longer without sending off branching shoots. This occurs because of a substance called auxin which is produced in the apical buds and which inhibits growth of stems from the lateral buds.
Auxin is a plant hormone that is involved in many signal processes. It is most commonly talked about in apical dominance
Lateral buds develop generally when apical dominance is terminated
Higher concentration of auxins in the axillary buds does not allow these buds to grow hence there is apical dominance.
apical dominance