Bonner J T
Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey 08544, USA.
Mycologia. 2006 Mar-Apr;98(2):260-4. doi: 10.3852/mycologia.98.2.260.
By comparing two species of cellular slime molds that have stalkless migration stages it is possible to gain interesting insights into how the cells move. In contrast to the familiar behavior of Dictyostelium discoideum, Dictyostelium polycephalum slugs can travel greater distances through soil and even can migrate through agar. In addition to the interest in the differences, these differences shed light on the mechanism of slug movement. Unlike D. discoideum, D. polycephalum does not have prestalk and prespore zones and severed sections of any part of these slugs move at a rate proportional to their length. This leads to the hypothesis that longer slugs move faster because the amoebae aligned along the inside of the slime sheath each contribute a forward push and the more extended the amoebae line is the faster the slug moves.
通过比较两种具有无柄迁移阶段的细胞黏菌，可以深入了解细胞的移动方式。与盘基网柄菌的常见行为不同，多头绒泡菌的蛞蝓状群体能够在土壤中移动更远的距离，甚至可以在琼脂中迁移。除了对这些差异感兴趣之外，这些差异还揭示了蛞蝓状群体移动的机制。与盘基网柄菌不同，多头绒泡菌没有前柄区和前孢子区，并且这些蛞蝓状群体任何部位的切断部分都以与其长度成比例的速度移动。这就引出了一个假设，即较长的蛞蝓状群体移动得更快，因为沿着黏液鞘内部排列的变形虫各自都提供一个向前的推力，而且变形虫排列得越伸展，蛞蝓状群体移动得就越快。
