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首页> 外文期刊>Plant and Soil >Effect of potassium starvation on the uptake of radiocaesium by spring wheat (Triticum aestivum cv. Tonic).
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Effect of potassium starvation on the uptake of radiocaesium by spring wheat (Triticum aestivum cv. Tonic).

机译：钾缺乏对春小麦对放射性铯吸收的影响（普通小麦滋补品）。

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摘要

Short-term growth chamber experiments were carried out to investigate the effect of internal tissue potassium concentration on the uptake of radiocaesium by wheat cv. Tonic. The results showed that potassium starvation increased Cs influx rates by afactor of 10 compared with non-starved plants. Solution to plant tissue transfer factor (TF) values also increased by approx. an order of magnitude after potassium starvation treatment. The enhancement of Cs influx rates by potassium starvation could beoffset by an increase in external potassium concentration: this effect is minimal at external potassium concentrations greater than～200μM (8 mg litre-1). This showed that Cs influx into plant roots is subject to control by both internal and external potassium status. The kinetics of Cs uptake by potassium in starved and non-starved plants can be described adequately by the Michaelis-Menten equation. It was shown that potassium starvation substantially reduces the Km value from～28 to 6μM, which suggests that starvation treatment increases significantly the affinity of plant roots for Cs+. Mechanisms involved in K-Cs interactions during plant uptake are discussed. The relevance of such mechanisms as determinants of radiocaesium uptake by plants growing under different ecological conditions is emphasised.
机译：进行短期生长室实验以研究内部组织钾浓度对小麦cv吸收放射性铯的影响。补品。结果表明，与未饥饿的植物相比，缺钾使Cs的流入速率增加了10倍。植物组织转移因子（TF）值的解决方案也增加了约。钾饥饿后处理一个数量级。钾饥饿引起的Cs流入速率的增加可被外部钾浓度的增加所抵消：当外部钾浓度大于〜200μM（8 mg·l）时，这种影响最小。这表明Cs流入植物根系受内部和外部钾状态的控制。饥饿和未饥饿植物中钾对Cs吸收的动力学可以通过Michaelis-Menten方程充分描述。结果表明，钾饥饿将Km值从约28μM降低至6μM，这表明饥饿处理显着提高了植物根系对Cs +的亲和力。讨论了植物吸收过程中参与K-Cs相互作用的机制。强调了诸如在不同生态条件下生长的植物吸收放射性铯的决定因素等机制的相关性。

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