Journal Article

Temporal and Spatial Expression Pattern of the <i>OSVP1</i> and <i>OSEM</i> Genes during Seed Development in Rice

Kazumaru Miyoshi, Yasuaki Kagaya, Yuichirou Ogawa, Yasuo Nagato and Tsukaho Hattori

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 3, pages 307-313
Published in print March 2002 | ISSN: 0032-0781
Published online March 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf040
Temporal and Spatial Expression Pattern of the OSVP1 and OSEM Genes during Seed Development in Rice

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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 β-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.

Keywords: Key words: Abscisic acid — Rice (Oryza sativa) — Seed maturation — Transgenic rice —VP1/ABI3.; Abbreviations: GUS, β-glucuronidase; DAP, days after pollination.

Journal Article.  4656 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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