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JXB Advance Access originally published online on September 10, 2004
Journal of Experimental Botany 2004 55(406):2213-2218; doi:10.1093/jxb/erh242
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Journal of Experimental Botany, Vol. 55, No. 406, © Society for Experimental Biology 2004; all rights reserved

RESEARCH PAPER

Osmotic stress in barley regulates expression of a different set of genes than salt stress does

Akihiro Ueda1, Arumugam Kathiresan2, Mayumi Inada1, Yukio Narita1, Toshihide Nakamura1, Weiming Shi1,3, Tetsuko Takabe1 and John Bennett2,*

1Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
2Plant Breeding, Genetics and Biochemistry Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines
3State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China

* To whom correspondence should be addressed. Fax: +63 2 845 0606. E-mail: J.BENNETT{at}CGIAR.ORG

Under high salt conditions, plant growth is severely inhibited due to both osmotic and ionic stresses. In an effort to dissect genes and pathways that respond to changes in osmotic potential under salt stress, the expression patterns were compared of 460 non-redundant salt-responsive genes in barley during the initial phase under osmotic versus salt stress using cDNA microarrays with northern blot and real-time RT-PCR analyses. Out of 52 genes that were differentially expressed under osmotic stress, 11, such as the up-regulated genes for pyrroline-5-carboxylate synthetase, betaine aldehyde dehydrogenase 2, plasma membrane protein 3, and the down-regulated genes for water channel 2, heat shock protein 70, and phospholipase C, were regulated in a virtually identical manner under salt stress. These genes were involved in a wide range of metabolic and signalling pathways suggesting that, during the initial phase under salt stress, several of the cellular responses are mediated by changes in osmotic potential.

Key words: Barley, cDNA microarray, gene expression, osmotic stress, salt stress


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