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【单选题】
(2018·全国高考模拟)油菜素甾醇是近年新发现的第六类植物激素,芸苔一种人工合成的油菜素甾醇类似物。某科研人员为了研究芸苔侧枝长度的影响,以拟的野生型植株和突变体植株为实验材料进行了相关实验,实验结果如图,下列说法错误的是:A.
本实验的自变量是不同芸苔素浓度
B.
芸苔促进野生型拟侧枝的伸长，可用于解除植物的顶端优势
C.
据图推测，拟的突变体植物有可能缺乏识别芸苔素的特异性受体
D.
芸苔素作用于植物，可以调节植物体基因组的表达进而促进植物的生长
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