rubidium/vairenis

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Exposure to a natural nitric oxide donor negatively affects the potential influx of rubidium in potassium-starved Arabidopsis plants.

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Nitric oxide (NO) and potassium (K⁺) exert a profound influence on the acclimation of plants to multiple stress conditions. A recent report indicated that exogenous addition of an NO donor causes, under conditions of adequate K⁺ supply, a detrimental effect on K⁺

Rubidium (potassium) uptake by Arabidopsis: a comparison of uptake by cells in suspension culture and by roots of intact seedlings.

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Experiments are reported in which the uptake of (86)Rb(+), used as an analog of K(+), into cultured cells of Arabidopsis thaliana is investigated. A single transport system is found with K(m) = 0.34 millimolar and V(max) = 14 nmoles per milligram of protein per hour. This system is blocked by the

How DELLAs contribute to control potassium uptake under conditions of potassium scarcity? Hypotheses and uncertainties.

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Maintenance of the inward transport of potassium (K) by roots is a critical step to ensure K-nutrition for all plant tissues. When plants are grown at low external K concentrations a strong enhancement of the activity of the AtHAK5 transporter takes place. In a recent work, we observed that the

Identification of strong modifications in cation selectivity in an Arabidopsis inward rectifying potassium channel by mutant selection in yeast.

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The Arabidopsis thaliana cDNA, KAT1, encodes a hyperpolarization-activated K+ channel. In the present study, we utilized a combination of random site-directed mutagenesis, genetic screening in a potassium uptake-deficient yeast strain, and electrophysiological analysis in Xenopus oocytes to identify

High-affinity K(+) transport in Arabidopsis: AtHAK5 and AKT1 are vital for seedling establishment and postgermination growth under low-potassium conditions.

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Potassium (K(+)) is a major plant nutrient required for growth and development. It is generally accepted that plant roots absorb K(+) through uptake systems operating at low concentrations (high-affinity transport) and/or high external concentrations (low-affinity transport). To understand the

Osmotic stress responses and plant growth controlled by potassium transporters in Arabidopsis.

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Osmotic adjustment plays a fundamental role in water stress responses and growth in plants; however, the molecular mechanisms governing this process are not fully understood. Here, we demonstrated that the KUP potassium transporter family plays important roles in this process, under the control of

Cesium Inhibits Plant Growth Primarily through Reduction of Potassium Influx and Accumulation in Arabidopsis.

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Cesium (Cs+) is known to compete with the macronutrient potassium (K+) inside and outside of plants and inhibit plant growth at high concentrations. However, the detailed molecular mechanisms of how Cs+ exerts its deleterious effects on K+ accumulation in plants are not fully elucidated. Here, we

A role for the AKT1 potassium channel in plant nutrition.

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In plants, potassium serves an essential role as an osmoticum and charge carrier. Its uptake by roots occurs by poorly defined mechanisms. To determine the role of potassium channels in planta, we performed a reverse genetic screen and identified an Arabidopsis thaliana mutant in which the AKT1

Expression of KT/KUP genes in Arabidopsis and the role of root hairs in K+ uptake.

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Potassium (K(+)) is the most abundant cation in plants and is required for plant growth. To ensure an adequate supply of K(+), plants have multiple mechanisms for uptake and translocation. However, relatively little is known about the physiological role of proteins encoded by a family of 13 genes,

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