指植物的主茎顶端生长占优势，同时抑制着它下面邻近的侧芽生长，使侧芽处于休眠状态的现象。原因是茎尖产生的生长素运输到侧芽，抑制了侧芽生长。为了促使主干长得又高又直，就要维护植物的顶端优势，任它自由生长并及时除去侧芽。在农作物(如棉花)的栽培中，也常根据其原理进行摘心，来达到增产的目的。
相反地，当光竞争减弱时，植物的顶端优势较弱，加强分枝结构以增大对光的截获。
Conversely, as competition for light decreases, there should be an increasing premium on branching that is achieved through weaker apical dominance to maximize light capture.
由根尖产生并向地上运输的细胞分裂素在克服顶端优势，促进侧芽生长的过程中必不可少。
From root the sharp creation combine the cell division vegetable that transports toward the ground Be overcoming the top advantage, promote the essential to have in the process of the side bud growth.
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