Mineral Nutrition Laboratory, United States Department of Agriculture, Agriculture Research Service, Plant Industry Station, Beltsville, Maryland 20705.
Plant Physiol. 1967 Dec;42(12):1658-64. doi: 10.1104/pp.42.12.1658.
A major portion of the calcium in a soybean root appears to be in less than 10% of the root volume. Specifically, Ca is considered to be almost entirely localized in the epidermal cell layer. This relationship was established from consideration of rates and extent of ion absorption and ion interactions during the absorption process.Presence of calcium at the root-solution interface was associated with a change in the apparent selectivity of K over Mg by soybean roots. Accumulation of calcium by soybean roots was negligible.
大豆根中大部分的钙似乎都不到根体积的 10%。具体来说，钙被认为几乎完全局限在表皮细胞层中。这种关系是通过考虑吸收过程中离子吸收和离子相互作用的速率和程度来确定的。在根-溶液界面处存在钙会导致大豆根对 K 的表观选择性相对于 Mg 发生变化。大豆根对钙的积累可以忽略不计。
