- Information
- Symbol: OsHKT1;4
- MSU: LOC_Os04g51830
- RAPdb: Os04g0607600
- Publication
- Sodium transport and HKT transporters: the rice model, 2003, The Plant Journal.
- A two-staged model of Na+ exclusion in rice explained by 3D modeling of HKT transporters and alternative splicing, 2012, PLoS One.
- OsHKT1;4-mediated Na+ transport in stems contributes to Na+ exclusion from leaf blades of rice at the reproductive growth stage upon salt stress., 2016, BMC Plant Biol.
- T-DNA Tagging-Based Gain-of-Function of OsHKT1;4 Reinforces Na Exclusion from Leaves and Stems but Triggers Na Toxicity in Roots of Rice Under Salt Stress., 2018, Int J Mol Sci.
- Constitutive Contribution by the Rice OsHKT1;4 Na + Transporter to Xylem Sap Desalinization and Low Na + Accumulation in Young Leaves Under Low as High External Na + Conditions, 2020, Front Plant Sci.
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Genbank accession number
- Key message
- For OsHKT1;4, alternative splicing of transcript and the anatomical complexity of the sheath needed to be taken into account
- Thus, Na(+) accumulation in a specific leaf blade seems to be regulated by abundance of a correctly spliced OsHKT1;4 transcript in a corresponding sheath
- The level of OsHKT1;4 transcripts was prominent in leaf sheaths throughout the growth stages
- Taken together, our results indicate a newly recognized function of OsHKT1;4 in Na(+) exclusion in stems together with leaf sheaths, thus excluding Na(+) from leaf blades of a japonica rice cultivar in the reproductive growth stage, but the contribution is low when the plants are in the vegetative growth stage
- In addition, (22)Na(+) tracer experiments using peduncles of RNAi and WT plants suggested xylem Na(+) unloading by OsHKT1;4
- Unexpectedly however, we demonstrate here accumulation of OsHKT1;4 transcripts in the stem including internode II and peduncle in the reproductive growth stage
- Moreover, phenotypic analysis of OsHKT1;4 RNAi plants in the vegetative growth stage revealed no profound influence on the growth and ion accumulation in comparison with WT plants upon salinity stress
- Here, we report results of the functional characterization of the OsHKT1;4 transporter in rice
- T-DNA Tagging-Based Gain-of-Function of OsHKT1;4 Reinforces Na Exclusion from Leaves and Stems but Triggers Na Toxicity in Roots of Rice Under Salt Stress.
- Here, we have characterized a transfer DNA (T-DNA) insertion mutant line of rice, which overexpresses OsHKT1;4, owing to enhancer elements in the T-DNA, to gain an insight into the impact of OsHKT1;4 on salt tolerance of rice
- We observed that progressive desalinization of the xylem sap along its ascent to the leaf blades still occurred in plants grown at submillimolar Na+ concentration, and that OsHKT1;4 was involved in reducing xylem sap Na+ concentration in roots in these conditions too
- Constitutive Contribution by the Rice OsHKT1;4 Na + Transporter to Xylem Sap Desalinization and Low Na + Accumulation in Young Leaves Under Low as High External Na + Conditions
- By analyzing transgenic rice plants expressing a GUS reporter gene construct, we observed that OsHKT1;4 is mainly expressed in xylem parenchyma in both roots and leaves
- Using mutant lines expressing artificial microRNA that selectively reduced OsHKT1;4 expression, the involvement of OsHKT1;4 in retrieving Na+ from the xylem sap in the roots upon salt stress was evidenced
- Three rice HKT genes, OsHKT1;1, OsHKT1;4 and OsHKT1;5, are known to contribute to salt tolerance by reducing Na+ accumulation in shoots upon salt stress
- Since OsHKT1;4 was found to be also well expressed in the roots in absence of salt stress, we extended the analysis of its role when plants were subjected to non-toxic Na+ conditions (0
- Here, we further investigate the mechanisms by which OsHKT1;4 contributes to this process and extend this analysis to the role of this transporter in plants in presence of low Na+ concentrations
- Connection
- OsHKT1;4, OsHKT1;5~SKC1~OsHKT8~OsHK1;5, A two-staged model of Na+ exclusion in rice explained by 3D modeling of HKT transporters and alternative splicing, Amongst these transporters, the cereal HKT1;4 and HKT1;5 are responsible for Na(+) exclusion from photosynthetic tissues, a key mechanism for plant salinity tolerance
- OsHKT1;4, OsJRL, OsJRL, a rice jacalin-related mannose-binding lectin gene, enhances Escherichia coli viability under high-salinity stress and improves salinity tolerance of rice., Overexpression of OsJRL in rice also enhanced salinity tolerance and increased the expression levels of a number of stress-related genes, including three LEA (late embryogenesis abundant proteins) genes (OsLEA19a, OsLEA23 and OsLEA24), three Na(+) transporter genes (OsHKT1;3, OsHKT1;4 and OsHKT1;5) and two DREB genes (OsDREB1A and OsDREB2B)
- OsHKT1;1~OsHKT4, OsHKT1;4, Constitutive Contribution by the Rice OsHKT1;4 Na + Transporter to Xylem Sap Desalinization and Low Na + Accumulation in Young Leaves Under Low as High External Na + Conditions, Three rice HKT genes, OsHKT1;1, OsHKT1;4 and OsHKT1;5, are known to contribute to salt tolerance by reducing Na+ accumulation in shoots upon salt stress
- OsHKT1;4, OsHKT1;5~SKC1~OsHKT8~OsHK1;5, Constitutive Contribution by the Rice OsHKT1;4 Na + Transporter to Xylem Sap Desalinization and Low Na + Accumulation in Young Leaves Under Low as High External Na + Conditions, Three rice HKT genes, OsHKT1;1, OsHKT1;4 and OsHKT1;5, are known to contribute to salt tolerance by reducing Na+ accumulation in shoots upon salt stress
- OsHKT1;4, OsNAC3, A NAC transcription factor OsNAC3 positively regulates ABA response and salt tolerance in rice., Furthermore, qRT-PCR and transcriptomic analysis were performed to identify the key OsNAC3 regulated genes related to ABA response and salt tolerance, such as OsHKT1;4, OsHKT1;5, OsLEA3-1, OsPM-1, OsPP2C68, and OsRAB-21
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