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Nitrogen (N) is a macronutrient that plays a crucial role in plant growth and development. Nitrate (    NO  3  -    ) is the most abundant N source in aerobic soils. Plants have evolved two adaptive mechanisms such as up-regulation of the high-affinity transport system (HATS) and alteration of the root system architecture (RSA), allowing them to cope with the temporal and spatial variation ofNO  3  -    . However, little information is available regarding the nitrate transporter in cucumber, one of the most important fruit vegetables in the world. In this study we isolated a nitrate transporter named  CsNRT2.1  from cucumber. Analysis of the expression profile of the  CsNRT2.1  showed that  CsNRT2.1  is a high affinity nitrate transporter which mainly located in mature roots. Subcellular localization analysis revealed that CsNRT2.1 is a plasma membrane transporter. In N-starved  CsNRT2.1  knock-down plants, both of the constitutive HATS (cHATS) and inducible HATS (iHATS) were impaired under low externalNO  3  -concentration. Furthermore, the  CsNRT2.1  knock-down plants showed reduced root length and lateral root numbers. Together, our results demonstrated that CsNRT2.1 played a dual role in regulating the HATS and RSA to acquireNO  3  -effectively under N limitation.

frontiers in plant science

Knock-Down of CsNRT2.1, a Cucumber Nitrate Transporter, Reduces Nitrate Uptake, Root length, and Lateral Root Number at Low External Nitrate Concentration