The DOI matches its Crossref record; 45 of the 45 references it cites were found in a registry or an index.
The Arabidopsis Nitrate Transporter NRT1.8 Functions in Nitrate Removal from the Xylem Sap and Mediates Cadmium Tolerance
Open accessAbstract
Long-distance transport of nitrate requires xylem loading and unloading, a successive process that determines nitrate distribution and subsequent assimilation efficiency. Here, we report the functional characterization of NRT1.8, a member of the nitrate transporter (NRT1) family in Arabidopsis thaliana. NRT1.8 is upregulated by nitrate. Histochemical analysis using promoter-β-glucuronidase fusions, as well as in situ hybridization, showed that NRT1.8 is expressed predominantly in xylem parenchyma cells within the vasculature. Transient expression of the NRT1.8:enhanced green fluorescent protein fusion in onion epidermal cells and Arabidopsis protoplasts indicated that NRT1.8 is plasma membrane localized. Electrophysiological and nitrate uptake analyses using Xenopus laevis oocytes showed that NRT1.8 mediates low-affinity nitrate uptake. Functional disruption of NRT1.8 significantly increased the nitrate concentration in xylem sap. These data together suggest that NRT1.8 functions to remove nitrate from xylem vessels. Interestingly, NRT1.8 was the only nitrate assimilatory pathway gene that was strongly upregulated by cadmium (Cd2+) stress in roots, and the nrt1.8-1 mutant showed a nitrate-dependent Cd2+-sensitive phenotype. Further analyses showed that Cd2+ stress increases the proportion of nitrate allocated to wild-type roots compared with the nrt1.8-1 mutant. These data suggest that NRT1.8-regulated nitrate distribution plays an important role in Cd2+ tolerance.
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Metadata
- Authors
- Li, J.-Y., Fu, Y.-L., Pike, S. M., Bao, J., Tian, W., Zhang, Y., Chen, C.-Z., Zhang, Y., Li, H.-M., Huang, J., Li, L.-G., Schroeder, J. I., Gassmann, W., & Gong, J.-M.
- Venue
- The Plant Cell
- Publisher
- Oxford University Press (OUP)
- Published
- 2010-05-01
- Volume
- 22
- Issue
- 5
- Pages
- 1633-1646
- ISSN
- 1040-4651 (ISSN-L)
- 1532-298X
- OpenAlex
- W2110452814
- Cited by
- 441
- References
- 45
- FWCI
- 20.74
- Type
- journal article
- Language
- en
- Open access
- green
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- Li, J.-Y., Fu, Y.-L., Pike, S. M., Bao, J., Tian, W., Zhang, Y., Chen, C.-Z., Zhang, Y., Li, H.-M., Huang, J., Li, L.-G., Schroeder, J. I., Gassmann, W., & Gong, J.-M. (2010). The Arabidopsis Nitrate Transporter NRT1.8 Functions in Nitrate Removal from the Xylem Sap and Mediates Cadmium Tolerance. The Plant Cell. https://doi.org/10.1105/tpc.110.075242
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