Masuda Y, Kamisaka S, Yamamoto R, Hoson T, Nishinari K
Department of Biology, Tezukayama College, Nara, Japan.
Biorheology. 1994 Mar-Apr;31(2):171-7. doi: 10.3233/bir-1994-31205.
In this review article, we discuss the changes in the mechanical properties of the primary cell wall of different organs of several species of plant seedlings grown under simulated microgravity conditions. We compared growth and tropistic responses of these organs growing under different microgravity conditions, namely: 1) 3-D clinostat (three-dimensional clinostat with two axes); 2) water-submergence for rice seedlings, and 3) for comparison, an accelerated gravity using a specifically designed centrifuge. We measured the minimum stress-relaxation time as the parameter representing the mechanical property of the cell wall. We also measured extensiblity, in mm/g. The 3-D clinostat condition disturbed the normal gravitropic response of organs but affected growth rate and mechanical properties of the cell wall very little. Water-submergence of rice seedlings caused an acceleration of coleoptile elongation in the dark and caused a marked change in the mechanical property of the cell wall. However, the additional gravity of 30-135 xg showed only a small effect on growth and the mechanical property of the cell wall.
在这篇综述文章中，我们讨论了几种植物幼苗不同器官的初生细胞壁在模拟微重力条件下生长时力学性能的变化。我们比较了这些器官在不同微重力条件下的生长和向性反应，具体如下：1）三维回转器（双轴三维回转器）；2）水稻幼苗的水浸处理，以及3）作为对照，使用专门设计的离心机施加加速重力。我们测量了最小应力松弛时间，将其作为代表细胞壁力学性能的参数。我们还以毫米/克为单位测量了伸展性。三维回转器条件扰乱了器官正常的向重力性反应，但对生长速率和细胞壁力学性能影响很小。水稻幼苗的水浸处理在黑暗中导致胚芽鞘伸长加速，并使细胞壁的力学性能发生显著变化。然而，30-135xg的附加重力对生长和细胞壁力学性能仅显示出较小的影响。
