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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Actin filament-organized local cortical endoplasmic reticulum aggregations in developing stomatal complexes of grasses
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Actin filament-organized local cortical endoplasmic reticulum aggregations in developing stomatal complexes of grasses

机译：发育的草气孔复合物中肌动蛋白丝组织的局部皮质内质网聚集

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摘要

Endoplasmic reticulum (ER) immunolabeling in developing stomatal complexes and in the intervening cells of the stomatal rows (ICSRs) of Zea mays revealed that the cortical-ER forms distinct aggregations lining locally expanding wall regions. The polarized subsidiary cell mother cells (SMCs), displayed a cortical-ER-patch lining the wall region shared with the inducing guard cell mother cell (GMC), which disorganized during mitosis. In dividing SMCs, ER persisted in the preprophase band region and was unequally distributed in the mitotic spindle poles. The subsidiary cells (SCs) formed initially an ER-patch lining the common wall with the GMC or the young guard cells and afterwards an ER-ring in the junction of the SC wall with the neighboring ones. Distinct ER aggregations lined the ICSR wall regions shared with the SCs. The cortical-ER aggregations in stomatal cells of Z. mays were co-localized with actin filament (AF) arrays but both were absent from the respective cells of Triticum turgidum, which follow a different morphogenetic pattern. Experimental evidence showed that the interphase ER aggregations are organized by the respective AF arrays, while the mitotic ER aggregations by microtubules. These results revealed that AF and ER demarcated "cortical cytoplasmic domains" are activated below the locally expanding stomatal cell wall regions, probably via a mechanosensing mechanism triggered by the locally stressed plasmalemma/cell wall continuum. The probable role(s) of the local ER aggregations are discussed.
机译：玉米气孔发育中的气孔复合体和中间细胞的内质网（ER）免疫标记显示，皮质ER形成独特的聚集物，排列在局部扩大的壁区域内。极化的辅助细胞母细胞（SMC）在与有丝分裂期间紊乱的诱导性保卫细胞母细胞（GMC）共享的壁区域内显示了一个皮质内质网膜。在分裂SMC中，ER保留在前期带区，并在有丝分裂纺锤体极中分布不均。辅助细胞（SC）最初形成了一个ER贴片，将通用壁与GMC或年轻的守卫细胞一起衬里，然后在SC壁与相邻细胞的交界处形成了一个ER环。与SC共享的ICSR墙区域排列着不同的ER聚合。玉米的气孔细胞中的皮质ER聚集体与肌动蛋白丝（AF）阵列共定位，但在小麦的各个细胞中都不存在，这遵循不同的形态发生模式。实验证据表明，相间ER聚集是由各自的AF阵列组织的，而有丝分裂ER聚集是由微管组成的。这些结果表明，AF和ER划定的“皮质胞质域”可能在局部扩大的气孔细胞壁区域下方被激活，这可能是由于局部应力性血浆膜/细胞壁连续体触发的机械传感机制所致。讨论了本地ER聚合的可能角色。

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