Department of Plant Physiology, University of Hawaii, Honolulu, Hawaii 96822.
Plant Physiol. 1974 Feb;53(2):158-63. doi: 10.1104/pp.53.2.158.
Accumulation of K(+) is insensitive to the anion supplied with it at a solution concentration below 1 mm. Rates of K(+) transport to the xylem from the same solutions are, however, dependent upon the anion present and decrease in the order NO(3) (-) >> Cl(-) > SO(4) (2-). Parallel effects on rates of exudation and anion transport result from kind and concentration of anion supplied and time of exposure to the solution. When high K salt concentrations are used, only linear relationships are found between solution concentrations and transport rates. However, ion concentration in the exudate increases more than external solution concentration, while exudation rate is unaffected. It is suggested that some of the ions transported are from compartments within the cells. At high solution concentrations KNO(3) results in more exudation and in higher ion concentration in the exudate than is found with KCl.
在溶液浓度低于 1 毫米时，K(+)的积累对与其一起供应的阴离子不敏感。然而，从相同溶液向木质部运输 K(+)的速率取决于存在的阴离子，并按 NO(3) (-) > Cl(-) > SO(4) (2-)的顺序降低。对渗出物和阴离子运输速率的平行影响源于供应的阴离子的种类和浓度以及暴露于溶液的时间。当使用高 K 盐浓度时，仅在溶液浓度和运输速率之间发现线性关系。然而，渗出物中的离子浓度比外部溶液浓度增加更多，而渗出速率不受影响。这表明一些被运输的离子来自细胞内的隔室。在高溶液浓度下，KNO(3)导致比 KCl 更多的渗出物和渗出物中更高的离子浓度。
