AMYLOPLAST SEDIMENTATION KINETICS IN GRAVISTIMULATED MAIZE ROOTS
AMYLOPLAST SEDIMENTATION KINETICS IN GRAVISTIMULATED MAIZE ROOTS
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DOI：
10.1007/bf00392225
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发表时间：
1985-01-01
期刊：
影响因子：
4.3
通讯作者：
LEOPOLD, AC
中科院分区：
文献类型：
--
作者：
SACK, FD;SUYEMOTO, MM;LEOPOLD, AC
重力刺激下玉米淀粉体沉降的研究用从细胞中心到每个造粉体的角度变化作为沉降指数来测量根。使用组织固定后重力刺激，平均造淀粉体角和重力刺激的持续时间之间的关系被发现是线性的对数时间尺度上绘制时。外推值的角度变化的开始是5.9秒后，重力刺激的整个人口的造淀粉体和11.8秒的铅造淀粉体。通过将瞬时角速度（以弧度计）乘以细胞中心对造粉体的半径，可以计算出初始沉降速度为19.1 μ m min-1（5.9 s）。在沉降过程中，平均淀粉体角超过计算的细胞角123在2.2分钟的所有淀粉体和19秒的新的下壁附近的铅淀粉体。因此，大量的沉降发生在演示时间内，计算为4.1分钟。这些动力学与重力感知的几个假设是一致的。
Amyloplast sedimentation in gravistimulated maize (Zea mays L.) roots was measured using the change in angle from the center of the cell to each amyloplast as an index of sedimentation. Using tissue fixed after gravistimulation, the relationship between mean amyloplast angle and the duration of gravistimulation was found to be linear when plotted on a logarithmic time scale. Extrapolated values for the onset of angular change are 5.9 s after the start of gravistimulation for the entire population of amyloplasts and 11.8 s for lead amyloplasts. By multiplying the instantaneous angular velocity (in radians) by the cell center to amyloplast radius, it is possible to calculate the initial sedimentation velocity to be 19.1 .mu.m min-1 at 5.9 s. During sedimentation, the mean amyloplast angles surpass the calculated cell corner angle of 123 at 2.2 min for all amyloplasts and at 19 s for lead amyloplasts near the new lower wall. Thus, substantial sedimentation occurs within the presentation time, calculated to be 4.1 min. These kinetics are consistent with several hypotheses of graviperception.