Potassium Transport in Corn Roots
نویسندگان
چکیده
منابع مشابه
Radial Salt Transport in Corn Roots ' Grace
Summtiizary. Primary roots of solution--grown, 5-day-old or 6-day-old seedlings of corn (Zea mays L.) 10 to 14 cm in length were used to study radial salt trtansport. Measurements were made of the volume of root pressure exudation, salt concentration of the exudate, and rate of salt movement into the xylem exudate. The 32p uptake, 09 consumption, and dehydrogenase activity of the root cortex an...
متن کاملPotassium Transport in Corn Roots : III. Perturbation by Exogenous NADH and Ferricyanide.
It has recently been reported that plasmalemma electron transport may be involved in the generation of H(+) gradients and the uptake of ions into root tissue. We report here on the influence of extracellular NADH and ferricyanide on K(+) ((86)Rb(+)) influx, K(+) ((86)Rb(+)) efflux, net apparent H(+) efflux, and O(2) consumption in 2-centimeter corn (Zea mays [A632 x Oh43]) root segments and int...
متن کاملPotassium transport in corn roots : I. Resolution of kinetics into a saturable and linear component.
Influx isotherms were obtained for (86)Rb(+) uptake into 2-cm corn (Zea mays [A632 x (C3640 x Oh43)] root segments for both low- (0.2 millimolar CaSO(4)) and high-salt (0.2 millimolar CaSO(4) + 5 millimolar KCl) grown roots. Unlike the discontinuous curves usually presented for K(+) influx, our isotherms were smooth, nonsaturating curves that approached linearity at K(+) (Rb(+)) concentrations ...
متن کاملCalcium inhibition of potassium absorption in corn roots.
Calcium (or magnesium) sulfate or chloride was found to inhibit energy dependent potassium transport in excised corn roots. This Ca(2+) inhibition of K(+) transport was most pronounced during the initial phases of transport. As the absorption periods were lengthened the effect of Ca(2+) gradually changed from an inhibition to a typical promotion (after about 30-45 mins) of K(+) transport. Kinet...
متن کاملThe Stoichiometry of Respiration-driven Potassium Transport in Corn Mitochondria.
Determinations were made for corn (Zea mays L., WF9-Tms x M14) mitochondria of the stoichiometric relationship between K(+) transport and bond energy produced in respiration (K(+)/ approximately ratio). With inward pumping of potassium acetate activated by NADH oxidation, the initial rate of K(+) transported into the sucrose inaccessible space varied between 0.58 and 0.97 K(+)/ approximately , ...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1985
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.79.3.771