First published online July 9, 2004; 10.1104/pp.104.039909
Plant Physiology 135:1697-1709 (2004)
© 2004 American Society of Plant Biologists
ENVIRONMENTAL STRESS AND ADAPTATION
Comparative Genomics in Salt Tolerance between Arabidopsis and Arabidopsis-Related Halophyte Salt Cress Using Arabidopsis Microarray1
Teruaki Taji,
Motoaki Seki,
Masakazu Satou,
Tetsuya Sakurai,
Masatomo Kobayashi,
Kanako Ishiyama,
Yoshihiro Narusaka,
Mari Narusaka,
Jian-Kang Zhu and
Kazuo Shinozaki*
Laboratory of Plant Molecular Biology, RIKEN Tsukuba Institute, Tsukuba, Ibaraki 3050074, Japan (T.T., M.S., Y.N., K.S.); Plant Mutation Exploration Team, Plant Functional Genomics Research Group, RIKEN Genomic Sciences Center, RIKEN Yokohama Institute, Tsurumi-ku, Yokohama 2300045, Japan (M.S., M.S., T.S., M.N.); Genomic Knowledge Base Research Team, Bioinformatics Group, RIKEN Genomic Sciences Center, RIKEN Yokohama Institute, Tsurumi-ku, Yokohama 2300045, Japan (M.S., T.S.); Experimental Plant Division, RIKEN BioResource Center, Tsukuba, Ibaraki 3050074, Japan (M.K., K.I.); Department of Biology, Tokyo Gakugei University, Koganei-shi, Tokyo 1848501, Japan (Y.N., M.N.); and Institute of Integrative Genome Biology and Department of Botany and Plant Sciences, University of California, Riverside, California 92521 (J.K.Z.)
Salt cress (Thellungiella halophila), a halophyte, is a genetic model system with a small plant size, short life cycle, copious seed production, small genome size, and an efficient transformation. Its genes have a high sequence identity (90%95% at cDNA level) to genes of its close relative, Arabidopsis. These qualities are advantageous not only in genetics but also in genomics, such as gene expression profiling using Arabidopsis cDNA microarrays. Although salt cress plants are salt tolerant and can grow in 500 mM NaCl medium, they do not have salt glands or other morphological alterations either before or after salt adaptation. This suggests that the salt tolerance in salt cress results from mechanisms that are similar to those operating in glycophytes. To elucidate the differences in the regulation of salt tolerance between salt cress and Arabidopsis, we analyzed the gene expression profiles in salt cress by using a full-length Arabidopsis cDNA microarray. In salt cress, only a few genes were induced by 250 mM NaCl stress in contrast to Arabidopsis. Notably a large number of known abiotic- and biotic-stress inducible genes, including Fe-SOD, P5CS, PDF1.2, AtNCED, P-protein, -glucosidase, and SOS1, were expressed in salt cress at high levels even in the absence of stress. Under normal growing conditions, salt cress accumulated Pro at much higher levels than did Arabidopsis, and this corresponded to a higher expression of AtP5CS in salt cress, a key enzyme of Pro biosynthesis. Furthermore, salt cress was more tolerant to oxidative stress than Arabidopsis. Stress tolerance of salt cress may be due to constitutive overexpression of many genes that function in stress tolerance and that are stress inducible in Arabidopsis.
1 This work was supported in part by the Genome Research Project in RIKEN (to K.S.) and by the Special Postdoctoral Researchers' Program from RIKEN (to T.T.).
Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.039909.
* Corresponding author; e-mail sinozaki{at}rtc.riken.go.jp; fax 81298364359.
Received January 29, 2004;
returned for revision April 7, 2004;
accepted April 8, 2004.
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