The microtubular cytoskeleton in cells of cold-treated roots of maize (Zea mays L.) shows tissue-specific responses
The microtubular cytoskeleton in cells of cold-treated roots of maize (Zea mays L.) shows tissue-specific responses
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DOI：
10.1007/bf01379366
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发表时间：
1993-06
期刊：
影响因子：
2.9
通讯作者：
F. Baluška;J. Parker;P. Barlow
中科院分区：
文献类型：
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作者：
F. Baluška;J. Parker;P. Barlow
在离玉米根尖不同距离的各种组织细胞中的微管（MT）表现出对冷（5 °C）的不同敏感性，如通过MT重新定向和解聚倾向所判断的。它们的反应似乎与它们最初的细胞内排列有关。一般来说，在冷处理的早期阶段（6-24 h），停止伸长的细胞中的MT是最不敏感的，但在后期阶段（5-7 d），大多数这些细胞中的MT最终解聚。外膜细胞表现出独特的冷反应。在这里，MT是显着的冷不稳定，并迅速解聚附近的根尖。然而，1天后，在更近端区域的许多细胞膜周细胞已重新聚合其MT作为密集的，随机组织的阵列。这些持续到冷处理的剩余时间。在根冠细胞、静止中心和前分生组织的远端细胞中，通过MT的再聚合，发现了类似的抗长期低温的能力。MT在寒冷中的再聚合可以使顶点在更有利（更温暖）的条件返回时恢复生长。
Microtubules (MTs) in cells of various tissues at different distances from the apex of the maize root exhibited different sensitivities to cold (5 °C), as judged by MT reorientation and tendency to depolymerization. Their responses seem to be related to their initial intracellular arrangements. Generally, MTs in cells which were ceasing elongation were the least sensitive during the early stages (6–24 h) of cold treatment, but during the later stages (5–7 d) MTs in most of these cells eventually depolymerized. Pericycle cells showed a unique cold response. Here the MTs were conspicuously cold-labile and quickly depolymerized near the root-tip. However, after 1 d many pericycle cells in more proximal regions had repolymerized their MTs as dense, randomly organized arrays. These persisted for the remainder of the cold treatment. A similar resistance to longterm chilling, by means of MT repolymerization, was found in cells of the root cap, quiescent centre and cells of the distal part of the former meristem. MT repolymerization in the cold may enable the apex to resume growth when more favourable (warmer) conditions return.