apical dominance


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apical dominance

a condition in plants where the stem apex prevents the development of side shoots from lateral buds near the apex. The dominance is controlled by the presence of high concentrations of plant hormones (AUXINS) at the apex, produced by the apical bud. Further down the stem the auxin concentration is reduced and strong lateral branches are formed. Pruning of the apical bud in, for example, rose bushes, causes lateral branches to develop.
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Low storage temperatures (<10[degrees]C) favor dormancy and reduce apical dominance in tubers, while high temperatures (>25[degrees]C) accelerate sprouting but do not favor breaking of apical dominance (BISOGNIN et al.
Strong apical dominance in apples coupled with the low chilling requirements of the terminal bud combine to mask chilling effects on axillary buds (NAOR et al.
Increasing number of branches per plant as result of foliar application of PGRs may be attributed to the high level of these retardants accompanied by reducing the level of IAA and GA3 which lead to inhibition of main stem apical dominance (Jindal et al.
Stimulatory effect of Cytokinins and interaction with IAA on the release of lateral buds of pea plants from apical dominance.
Besides interacting with auxins in the control of apical dominance, cytokinins (Greek cyto- cell + kine- to cut) are involved in cell division.
Indole-3-acetic acid (IAA) is the only active auxin found in plants today and is involved in numerous physiological processes in plants, including cellular elongation, phototropism, gravitropism, apical dominance, root initiation, ethylene production, fruit growth, sex expression, and weed control.
They need to learn apical dominance," says Oregon conifer wizard Don Howse.
Tension wood is formed by woody dicotyledons to generate the force necessary for reorientation of branches and stems following gravistimulation or loss of apical dominance.
Transported downward, auxin is known to have a role in controlling apical dominance, stem elongation, tropisms, and root development.
These processes include photoperiodism, shoot elongation, apical dominance, shade avoidance, and root development.