RESOLUTION OF DUAL MECHANISMS OF POTASSIUM ABSORPTION BY BARLEY ROOTS
RESOLUTION OF DUAL MECHANISMS OF POTASSIUM ABSORPTION BY BARLEY ROOTS
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DOI：
10.1073/pnas.49.5.684
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发表时间：
1963-01-01
影响因子：
11.1
通讯作者：
RAINS, DW
中科院分区：
文献类型：
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作者：
EPSTEIN, E;ELZAM, OE;RAINS, DW
大麦根对K和Rb的吸收速率与这些离子在外部溶液中的浓度之间的关系，在0.002-50 m范围内[图片]，是可以预测的，假设2个载体位点结合和运输离子。其中之一在浓度约为0时以半最大速度运行。018米[图片]，对Na的亲和力很低;第二个，在大约16米[图片]，与Na的竞争很激烈。当SO_4代替Cl为阴离子时，后者而不是前者的机理受到抑制。
The relationship between the rates of absorption of K and Rb by barley roots and the concentration of these ions in the external solution, over the range 0.002-50 m[image], is predictable on the assumption that 2 carrier sites bind and transport the ions. One of these operates at half-maximal velocity at a concentration of about 0. 018 m[image], with very low affinity for Na; the 2nd , at about 16 m[image], with severe competition by Na. The latter but not the former mechanism is inhibited when SO4 is the anion instead of Cl.