Blatt M R
Laboratory of Plant Physiology and Biophysics, Imperial College of Science, Technology and Medicine at Wye, TN25 5AH, UK.
Curr Opin Plant Biol. 2000 Jun;3(3):196-204.
Stomatal guard cells are unique as a plant cell model and, because of the depth of knowledge now to hand on ion transport and its regulation, serve as an excellent model for the analysis of stimulus-response coupling in higher plants. Parallel controls - mediated by Ca(2+), H(+) protein kinases and phosphatases - regulate the gating of the K(+) and Cl(-) channels that facilitate solute flux for stomatal movements. A growing body of evidence now indicates that oscillations in the cytosolic free concentration of Ca(2+) contribute to a 'signalling cassette', which is integrated within these events through an unusual coupling with membrane voltage. Additional developments during the past two years point to events in membrane traffic that play complementary roles in stomatal control. Research in these areas, especially, is now adding entirely new dimensions to our understanding of guard cell signalling.
气孔保卫细胞作为植物细胞模型独具特色，并且由于目前我们对离子运输及其调控的深入了解，它成为分析高等植物刺激-反应偶联的极佳模型。由Ca(2+)、H(+)蛋白激酶和磷酸酶介导的平行调控机制，控制着K(+)和Cl(-)通道的开闭，这些通道促进溶质通量，从而调节气孔运动。现在越来越多的证据表明，胞质游离Ca(2+)浓度的振荡构成了一个“信号盒”，该信号盒通过与膜电压的特殊偶联整合于这些过程之中。过去两年的其他研究进展表明，膜泡运输事件在气孔控制中发挥着互补作用。尤其是这些领域的研究，正在为我们对保卫细胞信号传导的理解增添全新的维度。
