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首页> 外文期刊>Агрохимия >Genotypic features of the nitrate absorption kinetics of maize and winter wheat seedlings.
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Genotypic features of the nitrate absorption kinetics of maize and winter wheat seedlings.

机译：玉米和冬小麦幼苗硝酸盐吸收动力学的基因型特征。

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摘要

The effect of increasing concentrations of nitrates on nitrate absorption kinetics was investigated in 3 genotypes of maize (Kubanskii 206, Moldavskii 270 and R811) and 3 of winter wheat (Mironovskaya 808, Inna and Wakefield) under hydroponic conditions. Nitrate content of roots and shoots was also evaluated. Treatment of 9-day-old seedlings with 0.01, 0.1, 1 and 10 mM NO3- caused an increase in Km and a lowering of Vmax in all genotypes. Vmax was negatively and Km positively correlated with seedling nitrate content. The cultivars differed in absolute values for the kinetic parameters of absorption, the degree of their reaction to increased nitrate concentration in the medium, and in the amount of nitrate accumulated in roots and shoots. The greatest variation amongst genotypes was observed for Vmax and shoot nitrate concentration. Varietal differences increased with increased nitrate concentration of the medium. The use of the parameters Vmax and Km in evaluating the effectiveness of nitrate absorption in plants is discussed.
机译：在水培条件下，研究了三种基因型玉米（Kubanskii 206，Moldavskii 270和R811）和三种冬小麦（Mironovskaya 808，Inna和Wakefield）中硝酸盐浓度增加对硝酸盐吸收动力学的影响。还评估了根和芽的硝酸盐含量。用0.01、0.1、1和10 mM NO3-处理9天龄幼苗会导致所有基因型的Km增加和Vmax降低。 Vmax与幼苗硝酸盐含量呈负相关，而Km与幼苗的硝酸盐含量呈正相关。这些品种的吸收动力学参数的绝对值，培养基中硝酸盐浓度增加的反应程度以及在根和茎中累积的硝酸盐量的绝对值都不同。在Vmax和芽硝酸盐浓度中，基因型之间的差异最大。品种差异随着培养基中硝酸盐浓度的增加而增加。讨论了使用参数Vmax和Km评估植物中硝酸盐吸收的有效性。

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