knock-down of csnrt2.1, a cucumber nitrate transporter, reduces nitrate uptake, root length, and lateral root number at low external nitrate concentration

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ID: 143913
2018
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Abstract
Nitrogen (N) is a macronutrient that plays a crucial role in plant growth and development. Nitrate (NO3-) 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 of NO3-. 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 external NO3- 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 acquire NO3- effectively under N limitation.
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Authors ;Yang Li;Juanqi Li;Yan Yan;Wenqian Liu;Wenna Zhang;Lihong Gao;Yongqiang Tian
Journal phytochemistry letters
Year 2018
DOI
10.3389/fpls.2018.00722
URL
https://www.frontiersin.org/article/10.3389/fpls.2018.00722/full
Keywords
1 nitrate cucumber transporter csnrt2

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