大豆对镁的吸收
Magnesium uptake by soybeans.
作者信息
Leggett J E, Gilbert W A
机构信息
Mineral Nutrition Laboratory, USDA, ARS, SWCRD, Beltsville, Maryland 20705.
出版信息
Plant Physiol. 1969 Aug;44(8):1182-6. doi: 10.1104/pp.44.8.1182.
Magnesium contents of soybean (Glycine max) roots increase and the K and Ca contents decrease with increased MgCl(2) concentrations in ambient solutions. The Mg uptake is inhibited when both Ca and K are present in the solution, but not by K or Ca alone. Chloride uptake, which is very low from the MgCl(2) solution, is greatly enhanced by the presence of K. The selectivity against Mg imparted by K + Ca appears to be at an external barrier for cation uptake as shown by its dependence on the presence of Ca in the external solution. The Ca content of roots is influenced only slightly by changes in external Ca concentrations from 10(-4) to 10(-2)m, but that of shoots is greatly enhanced as the Ca concentration is increased or the K concentration is decreased. These effects on Ca contents are explained as arising from transport to the shoot without involvement of vacuoles of root cells.
随着环境溶液中MgCl₂浓度的增加，大豆（Glycine max）根中的镁含量增加，钾和钙含量降低。当溶液中同时存在钙和钾时，镁的吸收受到抑制，但单独的钾或钙不会抑制。氯化物的吸收在MgCl₂溶液中非常低，但钾的存在会大大增强其吸收。钾和钙对镁的选择性似乎是在阳离子吸收的外部屏障处，这表现为它依赖于外部溶液中钙的存在。根中钙的含量仅受外部钙浓度从10⁻⁴到10⁻²m变化的轻微影响，但随着钙浓度的增加或钾浓度的降低，地上部分的钙含量会大大增加。对钙含量的这些影响被解释为是由于钙运输到地上部分而不涉及根细胞的液泡。
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