REORIENTATION OF MICROFIBRILS AND MICROTUBULES AT THE OUTER EPIDERMAL WALL OF MAIZE COLEOPTILES DURING AUXIN-MEDIATED GROWTH
REORIENTATION OF MICROFIBRILS AND MICROTUBULES AT THE OUTER EPIDERMAL WALL OF MAIZE COLEOPTILES DURING AUXIN-MEDIATED GROWTH
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DOI：
10.1111/j.1438-8677.1988.tb00012.x
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发表时间：
1988-02-01
期刊：
影响因子：
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通讯作者：
SCHOPFER, P
中科院分区：
文献类型：
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作者：
BERGFELD, R;SPETH, V;SCHOPFER, P
生长素对玉米(Zea maysL.)是由外表皮外细胞壁的延伸性控制的(Kutschera等人，1987)。在这里，我们研究了生长素通过相应地改变皮质微管的取向来改变新沉积的微纤维的取向来控制这一壁的延展性的假设。根据电子显微镜观察，内源生长素去除后生长停止与内壁表面纵向取向的微纤维和微管的相对增多有关。相反，外源生长素的重新诱导生长与内壁表面横向取向的微纤维和微管的相对增加有关。这些变化可以分别在去除和添加生长素后30-60分钟检测到。讨论了新沉积的壁微纤维的方向性变化对控制伸长生长的作用意义。
Auxin‐mediated elongation growth of isolated subapical coleoptile segments of maize (Zea maysL.) is controlled by the extensibility of the outer cell wall of the outer epidermis (Kutschera et al., 1987). Here we investigate the hypothesis that auxin controls the extensibility of this wall by changing the orientation of newly deposited microfibrils through a corresponding change in the orientation of cortical microtubules. On the basis of electron micrographs it is shown that cessation of growth after removal of the endogenous source of auxin is correlated with a relative increase of longitudinally orientated microfibrils and microtubules at the inner wall surface. Conversely, reinduction of growth by exogenous auxin is correlated with a relative increase of transversely orientated microfibrils and microtubules at the inner wall surface. These changes can be detected 30–60 min after the removal and addition of auxin, respectively. The functional significance of directional changes of newly desposited wall microfibrils for the control of elongation growth is discussed.