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Results for “Potassium Deficiency”

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At least 469 records · Page 26Linked to original sources
PubMed1968

Pyruvate Kinase Activity of Wheat Plants Grown under Potassium Deficient Conditions.

The activity of pyruvate kinase was determined in the first leaves of wheat plants grown under K(+)-deficient conditions. An enhancement of the enzyme activity compared with the normal plants was found to start from eighth day of growth, and about 4-fold increase in the enzyme activity was observed in 14-day wheat leaves. The addition of K(2)SO(4) to the nutrient solution given to the K(+)-deficient plants at tenth day resulted in the restoration of the enzyme activity to the normal level after 3 days. The levels of K(+) as well as carbohydrates and chlorophyll were found to return normal over the same period. These findings are discussed in relation to the metabolic pattern of plants at the early stages of K(+)-deficiency.

Journal Article↗
PubMed1990

Relation of cardiovascular disease to potassium and magnesium deficiencies.

Potassium and magnesium deficiencies, particularly those induced by conventional loop and thiazide diuretic therapy, have been linked in clinical studies to an increased frequency in serious arrhythmias and mortality in acute myocardial infarction. Magnesium repletion has been shown not only to increase magnesium levels, but also to increase muscle potassium and to decrease the frequency of ventricular ectopic beats. Potassium replenishment alone may have a detrimental effect in magnesium-depleted patients. The potassium-sparing diuretic spironolactone (Aldactone) has been shown to spare both potassium and magnesium, and may therefore be a more appropriate diuretic therapy in patients at cardiovascular risk.

Heart Failure↗
PubMed2005

Radial transport of water and abscisic acid (ABA) in roots of Zea mays under conditions of nutrient deficiency.

Radial water (J(V)) and abscisic acid (ABA) flows (J(ABA)) through maize root seedlings have been investigated under different conditions of nutrient deficiency. Whereas J(V) was reduced under nitrogen deficiency, potassium deficiency stimulated J(V). A substantial increase of J(ABA) was observed in roots kept under potassium deficiency. The observed changes of J(V) might have resulted from changed barrier properties of the endodermis. Nitrogen and potassium deficiency also caused an accumulation of endogenous ABA in root tissues. Under all conditions studied, except under K(+)-deficiency, external ABA (100 nM) caused an increase of J(V). The data of this study were used to analyse the relations between internal and endogenous root ABA, J(V), and J(ABA). The internal ABA of root tissues was positively correlated with J(V) and was highly significant (P <0.001 for internal and P=0.03 for endogenous root ABA) within the range 2-300 pmol g(-1) FW. It was also highly positively correlated to the radial ABA flows. There was also a highly positive correlation between J(V) and J(ABA). The data of this study indicate, for the first time, the relations between internal ABA, water, and ABA flows. Independent of treatment with external ABA, an ABA transport by solvent drag across the endodermis is confirmed.

Abscisic Acid↗
PubMed2004

A novel potassium deficiency-induced stimulon in Anabaena torulosa.

Potassium deficiency enhanced the synthesis of fifteen proteins in the nitrogen-fixing cyanobacterium Anabaena torulosa and of nine proteins in Escherichia coli. These were termed potassium deficiency-induced proteins or PDPs and constitute hitherto unknown potassium deficiency-induced stimulons. Potassium deficiency also enhanced the synthesis of certain osmotic stress-induced proteins. Addition of K+ repressed the synthesis of a majority of the osmotic stress-induced proteins and of PDPs in these bacteria. These proteins contrast with the dinitrogenase reductase of A. torulosa and the glycine betaine-binding protein of E. coli, both of which were osmo-induced to a higher level in potassium-supplemented conditions. The data demonstrate the occurrence of novel potassium deficiency-induced stimulons and a wider role of K+ in regulation of gene expression and stress responses in bacteria

Anabaena↗
PubMed1982

Demonstration of net potassium absorption in mammalian colon.

The present in vivo studies were performed in the rat to determine whether the colon was capable of net potassium absorption, as well as secretion, and to further elucidate the process responsible for net potassium movement. Both the proximal and distal lumina of the colon of control, potassium-deficient, and potassium-loaded animals were perfused with solutions containing either 140 or 20 mmol/l sodium. Net potassium secretion was present in both proximal and distal colon of control animals during perfusion with the 140 mmol/l sodium solution. The rate of net potassium secretion was reduced in the potassium-deficient animals. During perfusion with the 20 mmol/l sodium solution, the rate of potassium secretion was also reduced (compared with control perfusion solution) in both the control and potassium-deficient animals. As a result, there was net potassium absorption (0.94 +/- 0.14 mueq.1-1.g dry wt-1) and zero net potassium movement in the distal and proximal segments, respectively, of the potassium-deficient animals perfused with the low-sodium solution. Additional studies were performed to determine whether net potassium secretion was saturable and showed that, during progressive increases in the plasma potassium level, net secretion was constant at plasma potassium levels above 11-13 meq/l. These data, therefore, demonstrate that the mammalian colon regulates intestinal transport of potassium by both absorptive and secretory mechanisms and that a carrier-mediated process probably regulates both transport processes.

Animals↗
PubMedDate not supplied

[Dynamics of changes in the indicators of electrolyte metabolism after surgical treatment of Cushing's syndrome].

The authors present the results of study of the state of the water-electrolyte metabolism at the early postoperative period in 58 patients suffering from Itsenko-Cushing's disease with consideration of the potassium deficiency correction. Potassium and sodium level was studied in the plasma and the erythrocytes. Besides, in 31 patients potassium and sodium content were examined in the muscular tissue obtained during the operation. Hypoglycemia was revealed in 48.2% of the cases, and hypernatriemia--in 19.0%. A reduction of potassium level in the erythrocytes was revealed in 50%, and a rise of sodium--in 52% of cases. The muscle tissue potassium level fell in parallel to the reduction of this electrolyte level in the erythrocytes. Disturbances of the electrolyte balance proved to be most pronounced at the early postoperative period in the patients given no potassium preparations. Separate use of potassium preparations, or (particularly) together with veroshpiron, prevented potassium deficiency at the early postoperative period.

Adolescent↗