Bode P M, Bode H R
Dev Biol. 1984 Jun;103(2):304-12. doi: 10.1016/0012-1606(84)90318-x.
The relative sizes of the various structures in Hydra attenuata were compared over a broad range of animal sizes to determine in detail the ability to regulate proportions during regeneration. The three components of the head, namely hypostome, tentacles, and tentacle zone from which the tentacles emerge, the body column, and the basal disc were all measured separately. Ectodermal cell number was used as the measure of size. The results showed that the basal disc proportioned exactly over a 40-fold size range, and the tentacle tissue proportioned exactly over a 20-fold size range. In contrast, the hypostome and tentacle zone proportioned allometrically . With decreasing size, the hypostome and tentacle zone became an increasing fraction of the animal at the expense of body tissue, and in the very smallest regenerates at the expense of tentacle tissue. In their current form, the reaction-diffusion models proposed for pattern regulation in hydra are not consistent with the data.
为了详细确定水螅在再生过程中调节比例的能力，研究人员在广泛的动物大小范围内比较了细螅（Hydra attenuata）各种结构的相对大小。头部的三个组成部分，即口柄、触手以及触手伸出的触手区、体柱和基盘，均分别进行了测量。外胚层细胞数量被用作大小的衡量指标。结果表明，基盘在40倍的大小范围内精确地按比例分配，触手组织在20倍的大小范围内精确地按比例分配。相比之下，口柄和触手区呈异速生长。随着体型减小，口柄和触手区在动物中所占比例越来越大，牺牲的是身体组织，而在极小的再生个体中，牺牲的则是触手组织。就目前的形式而言，为水螅的模式调节提出的反应扩散模型与这些数据不一致。
