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首页> 外文期刊>Chinese science bulletin >Effects of the disaggregation of high-polymerized particles in guard cell vacuoles on osmoregulation of stomatal aperture (stomata opening)
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Effects of the disaggregation of high-polymerized particles in guard cell vacuoles on osmoregulation of stomatal aperture (stomata opening)

机译：保卫细胞液泡中高聚合颗粒的解离对气孔孔径​​渗透调节（气孔开口）的影响

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摘要

Observation under an electron microscope reveals that in closed and open stomata of V. faba, the average volume of particles in guard cell vacuoles (GCV) reduces about 3 orders in magnitude, while the distribution density of the particles increases about 2 orders of magnitude. By using the method of the ratio of fluorescent emissions with laser scanning confocal microscopy, the monitoring to stomata opening shows that during 10 to 30 s before the first distinguishable aperture of stomata, there is a change of pH in GCV about — 0.5 units. A quick stomatal opening immediately follows the changes of pH in GCV to reach a steady aperture about 12 μm in 100 — 200 s. This work proposes a model for the osmoregulation in GCV for stomatal opening. The proposed osmoregulation is related to the disaggregation of some polymerized particles inside GCV, which is probably induced by a -ΔpH in the vacuole. This model describes a process of osmoregulation that avoids the massive energy consuming transportation across cell membranes, which is a foundation of the current chemiosmotic hypothesis. This model is a supplement to the multiple controlling hypothesis for the stomatal movement, which widens research principle ideas for other quick movements in plants.
机译：在电子显微镜下观察发现，在封闭和敞开的蚕豆气孔中，保卫细胞液泡（GCV）中颗粒的平均体积减少了约3个数量级，而颗粒的分布密度则增加了约2个数量级。通过使用激光发射共聚焦显微镜的荧光发射率方法，对气孔张开的监测表明，在第一个可分辨的气孔孔径之前的10到30 s内，GCV中的pH值发生了大约-0.5单位的变化。气孔快速开口随GCV中pH的变化立即变化，从而在100-200 s内达到约12μm的稳定孔径。这项工作提出了用于气孔开放的GCV渗透调节模型。拟议的渗透调节作用与GCV内部某些聚合颗粒的分解有关，这很可能是由液泡中的-ΔpH引起的。该模型描述了渗透调节过程，该过程避免了跨细胞膜的大量能量消耗运输，这是当前化学渗透假说的基础。该模型是气孔运动多重控制假设的补充，它扩大了植物中其他快速运动的研究原理。

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