Institut für Botanik und Mikrobiologie der Technischen Universität München, Arcisstraße 21, D-8000, München 2, Federal Republic of Germany.
Planta. 1978 Jan;144(1):95-100. doi: 10.1007/BF00385013.
Chloride ions are necessary to compensate for the positively charged potassium ions imported into guard cells of Allium cepa L. during stomatal opening. Therefore an external Cl(-) supply of intact Allium plants is important. But high levels of chloride have been found to reduce the sensitivity of the starch-lacking stomata and isolated guard cell protoplasts (GCPs) from Allium to potassium ions, fusicoccin and abscisic acid. Furthermore, with high levels of chloride, malate anions disappear from the guard cells of Allium, a finding which contrasts with situation in Vicia where the stomatal sensitivity to K(+) ions, fusicoccin and ABA is not influenced by Cl(-) ions and malate levels are unaffected. It is suggested that the absence of malate as a proton yielding primer inhibits the mechanism of H(+)/K(+) exchange in Allium.
氯离子是洋葱保卫细胞在气孔开放时吸收钾离子所必需的。因此，完整洋葱植物的外部氯离子供应很重要。但是，高浓度的氯离子会降低缺乏淀粉的气孔和洋葱分离的保卫细胞原生质体（GCP）对钾离子、赤霉素和脱落酸的敏感性。此外，在高浓度氯离子的情况下，苹果酸阴离子从洋葱保卫细胞中消失，这一发现与 Vicia 中的情况形成对比，在 Vicia 中，氯离子和苹果酸水平不会影响气孔对 K+离子、赤霉素和 ABA 的敏感性。有人认为，没有苹果酸作为质子供体抑制剂会抑制洋葱中 H+/K+交换的机制。
