The growth of plant organ is related with the growth of other organs which takes place in different directions. This reciprocal relationship is known as correlation.
Apical dominance is most important correlation found in plants. During growth of apical bud growth of lower axillary bud is suppressed when apical bud is removed the growth of axillary bud is initiated. It means active growth of apices control the development of lateral buds. Auxin is responsible for apical dominance and also for inhibiting the growth of lateral bud. The inhibition of lateral bud is called inhibitory effect. The removal of apex releases the lateral buds from apical dominance is called compensatory effects.
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