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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Co-occurrence of tannin and tannin-less vacuoles in sensitive plants
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Co-occurrence of tannin and tannin-less vacuoles in sensitive plants

机译：敏感植物中单宁和无单宁液泡的同时存在

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摘要

Vacuoles of different types frequently coexist in the same plant cell, but the duality of the tannin/tannin-less vacuoles observed in Mimosa pudica L. is rare. In this plant, which is characterized by highly motile leaves, the development and original features of the double vacuolar compartment were detailed in primary pulvini from the young to the mature leaf stage. In young pulvini, the differentiation of tannin vacuoles first occurred in the epidermis and progressively spread toward the inner cortex. In motor cells of nonmotile pulvini, tannin deposits first lined the membranes of small vacuole profiles and then formed opaque clusters that joined together to form a large tannin vacuole (TV), the proportion of which in the cell was approximately 45 %. At this stage, transparent vacuole profiles were rare and small, but as the parenchyma cells enlarged, these profiles coalesced to form a transparent vacuole with a convexity toward the larger-sized tannin vacuole. When leaf motility began to occur, the two vacuole types reached the same relative proportion (approximately 30 %). Finally, in mature cells displaying maximum motility, the large transparent colloidal vacuole (CV) showed a relative proportion increasing to approximately 50 %. At this stage, the proportion of the tannin vacuole, occurring in the vicinity of the nucleus, decreased to approximately 10 %. The presence of the condensed type of tannins (proanthocyanidins) was proven by detecting their fluorescence under UV light and by specific chemical staining. This dual vacuolar profile was also observed in nonmotile parts of M. pudica (e.g., the petiole and the stem). Additional observations of leaflet pulvini showing more or less rapid movements showed that this double vacuolar structure was present in certain plants (Mimosa spegazzinii and Desmodium gyrans), but absent in others (Albizzia julibrissin, Biophytum sensitivum, and Cassia fasciculata). Taken together, these observations strongly suggest that a direct correlation cannot be found between the presence of a tannin vacuole and the osmoregulated motility of pulvini.
机译：不同类型的液泡经常共存于同一植物细胞中，但是在含羞草中观察到的单宁/无单宁液泡的二元性很少。在这种以高能动性叶片为特征的植物中，双液泡室的发育和原始特征从幼叶期到成熟叶期都在原产pulvini中进行了详细描述。在年轻的pulvini中，单宁液泡的分化首先发生在表皮，并逐渐向内皮层扩散。在不运动的pulvini运动细胞中，单宁沉积物首先排列在小液泡轮廓的膜上，然后形成不透明的簇，这些簇连接在一起形成大的单宁液泡（TV），其在细胞中的比例约为45％。在这个阶段，透明的液泡轮廓很少且很小，但是随着薄壁细胞的扩大，这些轮廓合并形成一个透明的液泡，向较大尺寸的单宁液泡凸出。当叶片运动开始发生时，两种液泡类型达到了相同的相对比例（约30％）。最后，在显示出最大运动性的成熟细胞中，大的透明胶体液泡（CV）显示相对比例增加到大约50％。在这一阶段，在细胞核附近出现的单宁液泡的比例下降到大约10％。单宁（原花色素）的缩合类型的存在是通过在紫外线下检测荧光并通过特定的化学染色来证明的。这种双液泡轮廓在鼠尾草的非运动部分（例如叶柄和茎）中也观察到。对小叶普尔维尼（Pulvini）的其他观察表明或多或少的快速运动表明，这种双液泡结构存在于某些植物中（含羞草（Mimosa spegazzinii）和回旋果蝇（Desmodium gyrans）），而在另一些植物中不存在（Albizzia julibrissin，Biophytum敏感植物和Cassia fasciculata）。综上所述，这些观察结果强烈表明，单宁液泡的存在与普尔维尼的渗透压运动之间没有直接的相关性。

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