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Plant and Cell Physiology, 2002, Vol. 43, No. 3 307-313
© 2002 Oxford University Press

Temporal and Spatial Expression Pattern of the OSVP1 and OSEM Genes during Seed Development in Rice

Kazumaru Miyoshi1,3, Yasuaki Kagaya2, Yuichirou Ogawa2, Yasuo Nagato1 and Tsukaho Hattori2,4

1 Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, 113-8657 Japan 2 Center for Molecular Biology and Genetics, Mie University, Tsu, 514-8507 Japan

The spatial and temporal expression patterns of the rice VP1 (OSVP1) gene, as well as the OSEM gene which it controls, were studied during seed development by in situ hybridization and immuno-localization techniques. The expression of OSVP1 could be detected in embryos as early as 2–3 d after pollination (DAP) and thereafter became preferentially localized to shoot, radicle and vascular tissues during the embryo development at both the mRNA and protein levels. In the aleurone layers, OSVP1 mRNA and protein were detected after 6 DAP. OSEM mRNA was detectable after 6 DAP in the embryo and aleurone tissue. The spatial distribution within the embryo of OSEM mRNA and OSVP1 mRNA/protein was very similar after 6 DAP. Transgenic rice carrying a ß-glucuronidase (GUS) gene transcribed from a chimeric promoter consisting of the CaMV 35S minimal promoter (–46) and the 55-bp promoter fragment of OSEM, minimally required for ABA and VP1 regulation, also exhibited a spatial pattern of GUS expression similar to that of OSEM and OSVP1. These results suggest that (OS)VP1 is a major determinant not only of the seed specificity but also of the spatial pattern of OSEM expression in the developing seed.

3 Present address: National Institute of Genetics, Mishima, 411-8540 Japan.

4 Corresponding author: E-mail, hattori@gene.mie-u.ac.jp; Fax, +81-59-231-9048.


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