To spring wheat,high IAA/(ZR+Z) in tillering stage was benefit to tiller,and to winter wheat,low IAA/(ZR+Z) was benefit to tiller.

• 春性小麦分蘖初期较高的IAA/(ZR+Z)比值利于小麦分蘖发生；冬性小麦分蘖初期较低的IAA/(ZR+Z)比值利于小麦分蘖的发生.