pH 对玉米根段吸收 IAA 的影响。
Effect of pH on IAA Uptake by Maize Root Segments.
机构信息
Institute of Plant Biology and Physiology, Biology Building, University of Lausanne, 1015 Lausanne, Switzerland.
出版信息
Plant Physiol. 1987 Feb;83(2):262-4. doi: 10.1104/pp.83.2.262.
The uptake of [5-(3)H]indoleacetic acid (IAA) by Zea mays L. root segments involves nonsaturable and saturable processes. The pH optimum of the saturable component was found to be 5.0. The proton ionophore carbonylcyanide p-trifluoromethoxyphenylhydrazone inhibited at 100 micromolar the saturable component of IAA uptake but had no effect on non-saturable uptake. This indicates that the saturable component of IAA uptake is dependent on the proton gradient across the plasmalemma. The high level of proton extrusion in the elongation zone of the root will stimulate nonsaturable and saturable uptake of IAA in that zone.
玉米根段对[5-(3)H]吲哚乙酸（IAA）的摄取涉及非饱和和饱和过程。发现饱和成分的 pH 最佳值为 5.0。质子离子载体羰基氰化物对三氟甲氧基苯腙在 100 微摩尔时抑制 IAA 摄取的饱和成分，但对非饱和摄取没有影响。这表明质膜上质子梯度依赖于 IAA 摄取的饱和成分。根伸长区中高水平的质子外排将刺激该区域中 IAA 的非饱和和饱和摄取。
Zotero 插件