Department of Soils and Plant Nutrition, University of California, Berkeley, California 94720.
Plant Physiol. 1971 Dec;48(6):747-51. doi: 10.1104/pp.48.6.747.
Sodium absorption by intact sugar beet plants (Beta vulgaris) was found to be mediated by at least two distinct mechanisms when uptake was studied over a wide range of Na and K concentrations. The first mechanism operates at low Na concentrations (<1 milliequivalent per liter); presence of K completely blocks this mechanism for Na. The second mechanism operates at high Na concentrations (>1 milliequivalent per liter), transporting Na as well as K; but apparently this mechanism is not active for Na absorption in young sugar beet plants up to the 10-leaf stage.
当研究范围涵盖广泛的钠离子和钾离子浓度时，发现完整的糖甜菜植株（Beta vulgaris）对钠离子的吸收是由至少两种不同的机制介导的。第一种机制在低钠离子浓度（<1 毫当量/升）下起作用；钾的存在完全阻断了这种钠离子机制。第二种机制在高钠离子浓度（>1 毫当量/升）下起作用，同时运输钠离子和钾离子；但显然，在 10 叶期之前，这种机制对年轻的糖甜菜植株的钠离子吸收没有活性。
