研究人员进行了多种植物激素对豌豆植株侧芽生长影响的实验，结果见下图。
请回答：
(1)比较曲线1、2、3与4，可知____________对侧芽的生长有抑制作用，其中起作用的主要激素是________，而且___________（激素）能解除这种激素的抑制作用。在保留顶芽的情况下，除了曲线3所采用的措施外，还可通过喷施___________的化合物促进侧芽生长。
(2)比较曲线4与5，可知赤霉素能明显促进___________。而在完整豌豆植株的顶芽中，赤霉素产生于___________组织。
(3)分析上图，推测侧芽生长速度不同的原因是侧芽内_____________浓度或比例的改变。
(1)顶芽 生长素 细胞分裂素 对抗生长素
(2)侧芽的伸长 分生
(3)植物激素
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