Cambial reactivation in locally heated stems of the evergreen conifer Abies sachalinensis (Schmidt) Masters
Cambial reactivation in locally heated stems of the evergreen conifer Abies sachalinensis (Schmidt) Masters
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DOI：
10.1007/s004250000430
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发表时间：
2001-04-01
期刊：
影响因子：
4.3
通讯作者：
Kubo, T
中科院分区：
文献类型：
--
作者：
Oribe, Y;Funada, R;Kubo, T
研究了形成层的活性，即形成层周围贮藏淀粉的分布。以及万年青针叶树高山冷杉（Abies sachalinensis）茎局部加热（22-26 ℃）后形成层细胞从休眠到再激活过程中微管的定位和出现。加热诱导形成层在茎的加热部分的局部再活化。直立射线形成层细胞在纺锤形形成层细胞和平卧射线形成层细胞重新激活前1 d恢复细胞分裂。梭形形成层细胞分裂的重新启动首先发生在韧皮部一侧。在热处理过程中。平卧射线形成层细胞和与形成层相邻的韧皮薄壁组织中的贮藏淀粉量减少，纺锤形形成层细胞中的贮藏淀粉量增加。在直立射线形成层细胞和平卧射线形成层细胞中都观察到微管、纺锤体微管和成膜体微管的前期带。相比之下，没有证据表明存在这样的preprophase带的微管被检测到梭形形成层细胞。结果表明，万年青针叶树茎的局部加热可能为研究完整树木形成层再激活的动态提供一个有用的实验模型系统。
A study was made of cambial activity, the localization of storage starch around the cambium. and the localization and occurrence of microtubules in cambial cells from dormancy to reactivation in locally heated (22-26 degreesC) stems of the evergreen conifer Abies sachalinensis. Heating induced localized reactivation of the cambium in the heated portions of the stem. Erect ray cambial cells resumed cell division 1 d prior to the reactivation of fusiform cambial cells and procumbent ray cambial cells. The re-initiation of the division of fusiform cambial cells occurred first on the phloem side. During the heat treatment. the amount of storage starch decreased in procumbent ray cambial cells and in the phloem parenchyma adjacent to the cambium but increased in fusiform cambial cells. Preprophase bands of microtubules, spindle microtubules and phragmoplast microtubules were observed both in erect ray cambial cells and in procumbent ray cambial cells. By contrast, no evidence of the presence of such preprophase bands of microtubules was detected in fusiform cambial cells. The results suggest that the localized heating of stems of evergreen conifers might provide a useful experimental model system for studies of the dynamics of cambial reactivation in intact trees.