STARCH STATOLITH HYPOTHESIS AND THE INTERACTION OF AMYLOPLASTS AND ENDOPLASMIC-RETICULUM IN ROOT GEOTROPISM
STARCH STATOLITH HYPOTHESIS AND THE INTERACTION OF AMYLOPLASTS AND ENDOPLASMIC-RETICULUM IN ROOT GEOTROPISM
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DOI：
10.1093/jxb/29.6.1319
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发表时间：
1978-01-01
影响因子：
6.9
通讯作者：
ROMMELHOFF, A
中科院分区：
文献类型：
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作者：
IVERSEN, TH;ROMMELHOFF, A
水芹(Lepdium Sativum L.)在135度连续刺激下，根尖倾斜向上的苗木，最终向地曲率比45度刺激下的大。或90度..这一众所周知的行为之前被解释为支持淀粉雕像假说。在这些试验中，两组水芹和生菜(Lactuca sativa L.)采用苗木：对照组允许根在不调整刺激角度的情况下弯曲，实验组在不同的时间间隔将根重新调整到原来的刺激角度。分别在45度、90度持续刺激。或135度。牙根弯曲度的变化持续时间为5~8h，最初(1~2 h)的弯曲率约为135度。和90度。控制和测试水芹和生菜的根部。此后，在135度刺激试根。遵循线性曲率模式。苗木受45度刺激。和90度。在曲度发展方面，试验组没有表现出相同的线性。当角度小于135度时，试验组的屈曲率普遍高于对照组。对水芹幼苗进行光镜和电子显微镜观察，跟踪统计细胞中细胞器的运动情况。在受试幼苗根的平衡细胞中，淀粉平衡柱位于第一次调整刺激角度之前的位置。在对照根的状态细胞中，淀粉稳定期跟随根尖的曲率，沿着细胞壁滑动并达到静止位置，与正常定向的根一样。对照和重新调整的根的行为被解释为淀粉稳定期和内质网膜相互作用的结果。
Roots of cress (Lepidium sativum L.) seedlings continuously stimulated at an angle of 135.degree., root tips pointing obliquely upwards, develop a larger final geotropic curvature than roots stimulated at 45.degree. or 90.degree.. This well-known behavior was previously interpreted as support for the starch statolith hypothesis. In these experiments, 2 groups of cress and lettuce (Lactuca sativa L.) seedlings were used: the control group in which the roots were allowed to curve without adjustment of the stimulation angle and the test group in which the roots were readjusted at different time intervals to the original stimulation angle. They were stimulated continuously at 45.degree., 90.degree. or 135.degree. and the development of root curvatures was followed over 5-8 h. Initially (1-2 h) the rate of curvature was approximately the same for 135.degree. and 90.degree. control and tested cress and lettuce roots. Thereafter, the test roots stimulated at 135.degree. followed a linear curvature pattern. Seedlings stimulated at 45.degree. and 90.degree. did not show the same linearity in curvature development in the test group. The rates of curvature in the test group were generally higher than in the control group at angles less than 135.degree.. Cress seedlings were examined by light microscopy and EM to follow the movement of the cell organelles in the statocytes. In the statocytes of test seedling roots the starch statoliths were located in the position, attained before the first readjustment of the stimulation angle. In the statocytes of control roots the starch statoliths followed the curvature of the root tip sliding along the cell walls and attaining the rest position as in normally orientated roots. The behavior of control and readjusted roots is interpreted as a result of interaction between starch statoliths and endoplasmic reticulum membranes.