NDLI: A rice homeobox gene, OSH1, is expressed before organ differentiation in a specific region during early embryogenesis.

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A rice homeobox gene, OSH1, is expressed before organ differentiation in a specific region during early embryogenesis.

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A rice homeobox gene, OSH1, is expressed before organ differentiation in a specific region during early embryogenesis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sato, Y. Matsuoka, M. Tagiri, A. Kitano, H. Nagato, Y. Yamamoto, N. Hong, S. K.
Description	Author Affiliation: Sato Y ( Nagoya Universiity, Bioscience Center, Chikusa, Japan.);
Abstract	Homeobox genes encode a large family of homeodomain proteins that play a key role in the pattern formation of animal embryos. By analogy, homeobox genes in plants are thought to mediate important processes in their embryogenesis, but there is very little evidence to support this notion. Here we described the temporal and spatial expression patterns of a rice homeobox gene, OSH1, during rice embryogenesis. In situ hybridization analysis revealed that in the wild-type embryo, OSH1 was first expressed at the globular stage, much earlier than organogenesis started, in a ventral region where shoot apical meristem and epiblast would later develop. This localized expression of OSH1 indicates that the cellular differentiation has already occurred at this stage. At later stages after organogenesis had initiated, OSH1 expression was observed in shoot apical meristem [except in the L1 (tunica) layer], epiblast, radicle, and their intervening tissues in descending strength of expression level with embryonic maturation. We also performed in situ hybridization analysis with a rice organless embryo mutant, orl1, that develops no embryonic organs. In the orl1 embryo, the expression pattern of OSH1 was the same as that in the wild-type embryo in spite of the lack of embryonic organs. This shows that OSH1 is not directly associated with organ differentiation, but may be related to a regulatory process before or independent of the organ determination. The results described here strongly suggest that, like animal homeobox genes, OSH1 plays an important role in regionalization of cell identity during early embryogenesis.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	15
Volume Number	93
Language	English
Publisher	National Academy of Sciences
Publisher Date	1996-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Gene Expression Regulation, Plant Genes, Homeobox Genes, Plant Oryza Sativa Physiology Cell Differentiation Gene Expression Regulation, Developmental In Situ Hybridization Methylnitrosourea Microscopy, Electron Mutagenesis Mutagens Genetics Growth & Development Ultrastructure Research Support, Non-U.S. Gov't Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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