Differential growth is a feature of cells, the organs which they construct and the whole plant itself. The control of differential growth at each of these three levels of organization resides in the level lower than that in which it is expressed. Thus, differential growth of cells is regulated by the patterns of intracellular microtubules and cellulose microfibrils of the walls, that of organs by the pattern of growth of their cells, and that of the organism by the relative rates of organ growth. The latter is, in turn, determined an all-pervading system of correlative interactions. Plant hormones by may play a role in each of these regulatory systems.

中文翻译：

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植物的差异生长——一种发生在各个组织层次的现象

差异生长是细胞、它们构建的器官和整个植物本身的一个特征。在这三个组织层次中的每一个层次上，对差异增长的控制都位于低于它所表达的层次。因此，细胞的差异生长受细胞内微管和细胞壁纤维素微纤维的模式调节，器官的生长受细胞生长模式的调节，生物体的生长受器官生长的相对速率的调节。后者反过来又决定了一个无处不在的相关相互作用系统。植物激素可能在这些调节系统中的每一个中发挥作用。