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First published online April 25, 2002; 10.1104/pp.001206

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Plant Physiol, May 2002, Vol. 129, pp. 72-84

Tissue Localization of a Submergence-Induced 1-Aminocyclopropane-1-Carboxylic Acid Synthase in Rice1

Zhongyi Zhou,2 Janice de Almeida Engler, Dominique Rouan, Frank Michiels, Marc Van Montagu, and Dominique Van Der Straeten*

Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology, Ghent University, K.L. Ledeganckstraat 35, B-9000 Ghent, Belgium (Z.Z., J.d.A.E., M.V.M., D.V.D.S.); and Aventis CropScience, B-9000 Ghent, Belgium (D.R., F.M.)

At least two 1-aminocyclopropane-1-carboxylic acid synthase genes (ACS) are implicated in the submergence response of rice (Oryza sativa). Previously, the OS-ACS5 gene has been shown to be induced during short- as well as long-term complete submergence of seedlings and to be controlled by a balance of gibberellin and abscisic acid in both lowland and deepwater rice. This study demonstrates that OS-ACS5 mRNA is localized in specific tissues and cells both during normal development and in response to complete submergence. The temporal and spatial regulation of OS-ACS5 expression is presented by in situ hybridization and histochemical analysis of beta -glucuronidase (GUS) activity in transgenic rice carrying an OS-ACS5-gus fusion. Whole-mount in situ hybridization revealed that in air-grown rice seedlings, OS-ACS5 was expressed at a low level in the shoot apex, meristems, leaf, and adventitious root primordia, and in vascular tissues of nonelongated stems and leaf sheaths. In response to complete submergence, the expression in vascular bundles of young stems and leaf sheaths was strongly induced. The results of histochemical GUS assays were consistent with those found by whole-mount in situ hybridization. Our findings suggest that OS-ACS5 plays a role in vegetative growth of rice under normal conditions and is also recruited for enhanced growth upon complete submergence. The possible implication of OS-ACS5 in root-shoot communication during submergence stress and its putative role in aerenchyma formation upon low-oxygen stress are discussed.


1 This work was supported by the European Union (grant no. ISC China CI1*-CT93-0082) and by the Geconcerteerde Overlegde Acties (grant no. GOA 96016).

2 Present address: CropDesign N.V., Technologiepark 3, B-9052 Ghent, Belgium.

* Corresponding author; e-mail dostr{at}gengenp.rug.ac.be; fax 32-9-2645333.

© 2002 American Society of Plant Physiologists



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