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首页> 外文期刊>Acta Physiologiae Plantarum >Spatial and temporal patterns of net nitrate uptake regulation and kinetics along the tap root of Citrus aurantium
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Spatial and temporal patterns of net nitrate uptake regulation and kinetics along the tap root of Citrus aurantium

机译：柑橘柑橘主根上净硝酸盐吸收调控的时空格局和动力学

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摘要

Spatial–temporal variation of the regulation and the kinetics of net nitrate (NO3 −) uptake rate (NNUR) along the tap root of Citrus aurantium L. were analysed. Suberin incrustation in the peripheral cell layers and plasma membrane (PM) H+-ATPase localisation, anatomical and physiological factors involved in NO3 − uptake were also investigated. The results clearly indicated a spatially uniform distribution of the regulation process, accompanied by a temporal heterogeneous pattern of the kinetics of NO3 − uptake along citrus tap root. In particular, kinetic analysis had a biphasic pattern, saturating (high affinity transport system) and linear (low affinity transport system), in response to increasing external NO3 − concentrations in each root region, where 200 μM NO3 − represented the threshold separating these two systems. Kinetic parameters, K m and V max, clearly indicated that apical segments reached the maximum value of induction before basal segments. Hence, the apical root zones, early exhibiting the maximum of potential capacity to absorb the NO3 −, could be considered more efficient than basal root segments for acquiring NO3 − from external solution. Suberin incrustations in the hypodermal cell layer, characterised by uniform fluorescence intensity among the root segments, could be responsible for the unchanged NNUR, while the PM H+-ATPase could explain the temporal pattern of NNUR.
机译：分析了桔梗主根上净硝酸盐（NO 3 -）吸收速率（NNUR）的调节时空变化和动力学。周围细胞层中的Suberin结壳和质膜（PM）H + -ATPase定位，NO 3 -吸收所涉及的解剖和生理因素还进行了调查。结果清楚地表明调节过程在空间上是均匀分布的，伴随着沿柑橘的主根吸收NO 3 -的动力学的时间异质模式。尤其是，动力学分析具有两相模式，即饱和（高亲和力传输系统）和线性（低亲和力传输系统）响应于外部NO 3 -浓度的增加而饱和。每个根区域，其中200μMNO 3 -表示分离这两个系统的阈值。动力学参数K m 和V max 清楚地表明，心尖节段在基底节段之前达到最大值。因此，可以认为顶端根区在早期表现出最大的吸收NO 3 -的潜在能力，它比基底根段更有效地获得NO 3 -来自外部解决方案。下皮细胞层中的木栓质结垢，其特征是在根段之间具有均匀的荧光强度，这可能是NNUR不变的原因，而PM H + -ATPase可以解释NNUR的时间模式。

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