NDLI: The sugar beet gene encoding the sodium/proton exchanger 1 (BvNHX1) is regulated by a MYB transcription factor

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The sugar beet gene encoding the sodium/proton exchanger 1 (BvNHX1) is regulated by a MYB transcription factor

Content Provider	PubMed Central
Author	Adler, Guy Eduardo, Blumwald Bar-zvi, Dudy
Abstract	Sodium/proton exchangers (NHX) are key players in the plant response to salinity and have a central role in establishing ion homeostasis. NHXs can be localized in the tonoplast or plasma membranes, where they exchange sodium ions for protons, resulting in sodium ions being removed from the cytosol into the vacuole or extracellular space. The expression of most plant NHX genes is modulated by exposure of the organisms to salt stress or water stress. We explored the regulation of the vacuolar NHX1 gene from the salt-tolerant sugar beet plant (BvNHX1) using Arabidopsis plants transformed with an array of constructs of BvHNX1::GUS, and the expression patterns were characterized using histological and quantitative assays. The 5′ UTR of BvNHX1, including its intron, does not modulate the activity of the promoter. Serial deletions show that a 337 bp promoter fragment sufficed for driving activity that indistinguishable from that of the full-length (2,464 bp) promoter. Mutating four putative cis-acting elements within the 337 bp promoter fragment revealed that MYB transcription factor(s) are involved in the activation of the expression of BvNHX1 upon exposure to salt and water stresses. Gel mobility shift assay confirmed that the WT but not the mutated MYB binding site is bound by nuclear protein extracted from salt-stressed Beta vulgaris leaves.
Related Links	http://dx.doi.org/10.1007/s00425-010-1160-7
Ending Page	195
Page Count	9
Starting Page	187
File Format	PDF
ISSN	00320935
e-ISSN	14322048
Journal	Planta
Issue Number	1
Volume Number	232
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-01
Access Restriction	Open
Rights Holder	Springer-Verlag
Subject Keyword	Plant Science Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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