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JXB Advance Access originally published online on March 10, 2006
Journal of Experimental Botany 2006 57(6):1391-1398; doi:10.1093/jxb/erj118
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. The online version of this article has been published under an Open Access model. Users are entitled to use, reproduce, disseminate, or display the Open Access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and the Society for Experimental Biology are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact: journals.permissions@oxfordjournals.org

RESEARCH PAPER

A root-specific bZIP transcription factor is responsive to water deficit stress in tepary bean (Phaseolus acutifolius) and common bean (P. vulgaris)

Laura Rodriguez-Uribe and Mary A. O'Connell*

Department of Agronomy and Horticulture, New Mexico State University, Las Cruces, NM 88003, USA

* To whom corresponding should be addressed. E-mail: moconnel{at}nmsu.edu

Root cDNA libraries were differentially screened to isolate water deficit-responsive transcripts in the relatively drought-resistant plant tepary bean (Phaseolus acutifolius). A novel root-specific, water deficit-responsive transcript was identified and predicted to encode a bZIP transcription factor. The orthologous form of this gene was isolated from the drought-sensitive P. vulgaris and the patterns of expression of these genes compared. These genes have predicted amino acid sequences in the bZIP domain that are 64% similar to a soybean bZIP protein. There were three amino acid differences between the P. acutifolius bZIP and the P. vulgaris gene product. Both species transcribed this gene in a root-specific and water deficit-responsive manner. The cell-specific pattern of expression for the gene was determined using in situ hybridization and immunolocalization. Two tissues in the root accumulated the protein: epidermis and phloem. The nuclear localization of this protein was determined by electron microscopy. The bZIP protein accumulated in the nuclei of both the epidermal cell and the vascular cell in response to water deficit stress in both species in a similar manner.

Key words: Chromatin, drought resistance, immunolocalization, in situ hybridization, Phaseolus acutifolius, Phaseolus vulgaris, TEM


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