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JXB Advance Access published online on January 30, 2004
Journal of Experimental Botany, doi:10.1093/jxb/erh070
© 2004 by Oxford University Press
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Received May 16, 2003; accepted November 13, 2003
© 2004 Society for Experimental Biology

RESEARCH PAPER

Effect of salt and osmotic stresses on the expression of genes for the vacuolar H+-pyrophosphatase, H+-ATPase subunit A, and Na+/H+ antiporter from barley

Atsunori Fukuda 1*, Kazuhiro Chiba 1, Miki Maeda 1, Atsuko Nakamura 2, Masayoshi Maeshima 3, and Yoshiyuki Tanaka 1

1 National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki 305-8602, Japan
2 Institute of Biological Sciences, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki 305-8572, Japan
3 Laboratory of Cell Dynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

* To whom correspondence should be addressed. E-mail: fukuda{at}affrc.go.jp.


  Abstract

Two cDNA clones encoding vacuolar H+-inorganic pyrophosphatase (HVP1 and HVP10), one clone encoding the catalytic subunit (68 kDa) of vacuolar H+-ATPase (HvVHA-A), and one clone encoding vacuolar Na+/H+ antiporter (HvNHX1) were isolated from barley (Hordeum vulgare), a salt-tolerant crop. Salt stress increased the transcript levels of HVP1, HVP10, HvVHA-A, and HvNHX1, and osmotic stress also increased the transcript levels of HVP1 and HvNHX1 in barley roots. The transcription of HVP1 in response to salt stress was regulated differently from that of HVP10. In addition, the HVP1 expression changed in a pattern similar to that of HvNHX1 expression. These results indicate that the expression of HVP1 is co-ordinated with that of HvNHX1 in barley roots in response to salt and osmotic stresses.

Key words: Barley (Hordeum vulgare), Na+/H+ antiporter, salt stress, vacuolar H+-ATPase (EC 3.6.1.3), vacuolar H+-inorganic pyrophosphatase (EC 3.6.1.1).


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