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Temporal and Spatial Patterns of Accumulation of the Transcript
of Myo-Inositol-1-Phosphate Synthase and Phytin-Containing
Particles during Seed Development in Rice1
Kaoru T. Yoshida,
Tomikichi Wada,
Hiroshi Koyama2,
Ritsuko Mizobuchi-Fukuoka3, and
Satoshi Naito*
Department of Agricultural and Environmental Biology, Graduate
School of Agricultural and Life Sciences, University of Tokyo, Tokyo
113-8657, Japan (K.T.Y., H.K., R.M.-F.); School of Agricultural
Science, Nagoya University, Nagoya 464-8601, Japan (T.W.); and Department of Applied Bioscience, Faculty of Agriculture, Hokkaido
University, Sapporo 060-8589, Japan (S.N.)
Myo-inositol-1-phosphate
(I[1]P) synthase (EC 5.5.1.4) catalyzes the reaction from glucose
6-phosphate to I(1)P, the first step of myo-inositol
biosynthesis. Among the metabolites of I(1)P is inositol
hexakisphosphate, which forms a mixed salt called phytin
or phytate, a storage form of phosphate and cations in seeds. We have
isolated a rice (Oryza sativa L.) cDNA clone, pRINO1, that is highly homologous to the I(1)P synthase from yeast and plants.
Northern analysis of total RNA showed that the transcript accumulated
to high levels in embryos but was undetectable in shoots, roots, and
flowers. In situ hybridization of developing seeds showed that the
transcript first appeared in the apical region of globular-stage
embryos 2 d after anthesis (DAA). Strong signals were detected in
the scutellum and aleurone layer after 4 DAA. The level of the
transcript in these cells increased until 7 DAA, after which time it
gradually decreased. Phytin-containing particles called globoids
appeared 4 DAA in the scutellum and aleurone layer, coinciding with the
localization of the RINO1 transcript. The temporal and spatial patterns
of accumulation of the RINO1 transcript and globoids suggest that I(1)P
synthase directs phytin biosynthesis in rice seeds.
1
This work was supported in part by a
Grant-in-Aid for Scientific Research from the Ministry of Education,
Science and Culture of Japan to K.T.Y.
2
Present address: Kyushu National Agricultural
Experimental Station, Chikugo 833-0041, Japan.
3
Present address: Nakano Central Research
Institute, Nakano Vinegar Co., Handa 475-8585, Japan.
*
Corresponding author; e-mail naito{at}abs.agr.hokudai.ac.jp; fax
81-11-706-4932.
Plant Physiol. (1999) 119: 65-72
Copyright Clearance Center: 0032-0889/99/119//08
© 1999 American Society of Plant Physiologists
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