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JXB Advance Access published online on October 5, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri298
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received January 6, 2005
Accepted August 23, 2005

RESEARCH PAPER

Characterization of transgenic Arabidopsis plants overexpressing GR-RBP4 under high salinity, dehydration, or cold stress

Kyung Jin Kwak 1, Yeon Ok Kim 1, and Hunseung Kang 1*

1 Division of Applied Plant Science and Agricultural Plant Stress Research Center, College of Agriculture and Life Sciences, Chonnam National University, 300 Youngbong-Dong, Buk-gu, Gwangju 500-757, South Korea

* To whom correspondence should be addressed.
Hunseung Kang, E-mail: hskang{at}chonnam.ac.kr


  Abstract

A glycine-rich RNA-binding protein4 (GR-RBP4), one of the eight GR-RBP family members in Arabidopsis thaliana, was investigated for its stress-related expression, nucleic acid-binding property, and functional roles in plants subjected to various stresses including cold, high salinity, and dehydration. Real-time RT-PCR and GUS expression analyses showed that GR-RBP4 was abundantly expressed in young plants, root tips, and flowers, but weakly in mature leaves and stems, implying that GR-RBP4 is highly expressed in actively proliferating organs. The transcript level of GR-RBP4 increased markedly with cold stress, decreased significantly with salt stress, and decreased slightly with dehydration stress. In vitro nucleic acid-binding assays revealed that GR-RBP4 protein binds sequence non-specifically to RNAs and DNAs. Characterization of the transgenic Arabidopsis plants overexpressing GR-RBP4 under the control of the 35S promoter revealed that 35S::GR-RBP4 lines displayed retarded germination compared with the wild type under salt or dehydration stress. Despite the marked up-regulation of GR-RBP4 expression by cold stress, the 35S::GR-RBP4 lines did not show any noticeable changes in cold or freezing tolerance compared with wild-type plants. These results indicate that GR-RBP4 contributes differently to altered germination and seedling growth of Arabidopsis plants under various stress conditions.

Keywords: Glycine-rich RNA-binding protein; RNA-binding protein; stress; transgenic Arabidopsis thaliana plants.
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