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Dive into the research topics where Fumiko Fujii is active.

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Featured researches published by Fumiko Fujii.


Soil Science and Plant Nutrition | 2004

Identification of several rice genes regulated by Si nutrition

Shuichi Watanabe; Emi Shimoi; Naoko Ohkama; Hiroaki Hayashi; Tadakatsu Yoneyama; Junshi Yazaki; Fumiko Fujii; Kanako Shinbo; Kimiko Yamamoto; Katsumi Sakata; Takuji Sasaki; Naoki Kishimoto; Shoshi Kikuchi; Toru Fujiwara

Abstract Rice plants were grown for 4 weeks in nutrient solutions containing 0, 0.015, 0.15, and 1.5 mm silicate. Si content in leaves was lower in the plants grown at low silicate concentrations. RNA was extracted from leaves and subjected to microarray analysis. Statistical analysis of the data from two independent hybridizations enabled to identify a number of candidate clones regulated by Si nutritional conditions. Quantitative reverse transcriptionme diated-PCR enabled to identify-five genes whose transcript accumulation was affected by Si nutrition.


Plant and Cell Physiology | 2012

High-throughput Cryopreservation of Plant Cell Cultures for Functional Genomics

Yoichi Ogawa; Nozomu Sakurai; Akira Oikawa; Kosuke Kai; Yoshihiko Morishita; Kumiko Mori; Kanami Moriya; Fumiko Fujii; Koh Aoki; Hideyuki Suzuki; Daisaku Ohta; Kazuki Saito; Daisuke Shibata

Suspension-cultured cell lines from plant species are useful for genetic engineering. However, maintenance of these lines is laborious, involves routine subculturing and hampers wider use of transgenic lines, especially when many lines are required for a high-throughput functional genomics application. Cryopreservation of these lines may reduce the need for subculturing. Here, we established a simple protocol for cryopreservation of cell lines from five commonly used plant species, Arabidopsis thaliana, Daucus carota, Lotus japonicus, Nicotiana tabacum and Oryza sativa. The LSP solution (2 M glycerol, 0.4 M sucrose and 86.9 mM proline) protected cells from damage during freezing and was only mildly toxic to cells kept at room temperature for at least 2 h. More than 100 samples were processed for freezing simultaneously. Initially, we determined the conditions for cryopreservation using a programmable freezer; we then developed a modified simple protocol that did not require a programmable freezer. In the simple protocol, a thick expanded polystyrene (EPS) container containing the vials with the cell–LSP solution mixtures was kept at −30°C for 6 h to cool the cells slowly (pre-freezing); samples from the EPS containers were then plunged into liquid nitrogen before long-term storage. Transgenic Arabidopsis cells were subjected to cryopreservation, thawed and then re-grown in culture; transcriptome and metabolome analyses indicated that there was no significant difference in gene expression or metabolism between cryopreserved cells and control cells. The simplicity of the protocol will accelerate the pace of research in functional plant genomics.


Soil Science and Plant Nutrition | 2004

Upregulation of the genes for ferritin, RNase, and DnaJ in leaves of rice plants in response to sulfur deficiency

Naoko Ohkama-Ohtsu; Naoki Kishimoto; Junshi Yazaki; Fumiko Fujii; Kanako Shinbo; Zempei Shimatani; Yuko Nagata; Akiko Hashimoto; Tomoya Ohta; Yuki Sato; Sachiko Honda; Kimiko Yamamoto; Katsumi Sakata; Takuji Sasaki; Shoshi Kikuchi; Hiroaki Hayashi; Tadakatsu Yoneyama; Toru Fujiwara

Abstract Microarray analysis was carried out with mRNAs isolated from aerial portions of rice plants subjected to sulfur deficiency. Among the candidate clones regulated by sulfur deficiency, three genes were identified by northern analysis that showed altered levels of mRNA accumulation. Genes similar to those for ferritin, S-like ribonuclease, and DnaJ-like protein were down-, down-, and upregulated by sulfate deficiency, respectively. These genes were found for the first time to be responsive to sulfur nutrition in the present study.


Bioscience, Biotechnology, and Biochemistry | 2003

Novel Gene Encoding a Ca2+-Binding Protein and under Hexokinase-dependent Sugar Regulation

Shigeo Otsuki; Akira Ikeda; Tomomi Sunako; Shoshi Muto; Junshi Yazaki; Keiko Nakamura; Fumiko Fujii; Kanako Shimbo; Yoshimi Otsuka; Kimiko Yamamoto; Katsumi Sakata; Takuji Sasaki; Naoki Kishimoto; Shoshi Kikuchi; Junji Yamaguchi

A cDNA encoding a predicted 15-kDa protein was earlier isolated from sugar-induced genes in rice embryos (Oryza sativa L.) by cDNA microarray analysis. Here we report that this cDNA encodes a novel Ca2+-binding protein, named OsSUR1 (for Oryza sativa sugar-up-regulated-1). The recombinant OsSUR1 protein expressed in Escherichia coli had 45Ca2+-binding activity. Northern analysis showed that the OsSUR1 gene was expressed mainly in the internodes of mature plants and in embryos at an early stage of germination. Expression of the OsSUR1 gene was induced by sugars that could serve as substrates of hexokinase, but expression was not repressed by Ca2+ signaling inhibitors, calmodulin antagonists and inhibitors of protein kinase or protein phosphatase. These results suggested that OsSUR1 gene expression was stimulated by a hexokinase-dependent pathway not mediated by Ca2+.


The Plant Cell | 2002

A Comprehensive Rice Transcript Map Containing 6591 Expressed Sequence Tag Sites

Jianzhong Wu; Tomoko Maehara; Takanori Shimokawa; Shinichi Yamamoto; Chizuko Harada; Yuka Takazaki; Nozomi Ono; Yoshiyuki Mukai; Kazuhiro Koike; Jyunshi Yazaki; Fumiko Fujii; Ayahiko Shomura; Tsuyu Ando; Izumi Kono; Kazunori Waki; Kimiko Yamamoto; Masahiro Yano; Takashi Matsumoto; Takuji Sasaki


Plant Cell and Environment | 2003

Transcriptomic analysis of metabolic changes by phosphorus stress in rice plant roots

Jun Wasaki; Ryoma Yonetani; S. Kuroda; Takuro Shinano; Junshi Yazaki; Fumiko Fujii; Kanako Shimbo; K. Yamamoto; K. Sakata; Takuji Sasaki; Naoki Kishimoto; Shoshi Kikuchi; M. Yamagishi; Mitsuru Osaki


Plant Journal | 2002

cDNA microarray analysis of gene expression during Fe-deficiency stress in barley suggests that polar transport of vesicles is implicated in phytosiderophore secretion in Fe-deficient barley roots.

Takashi Negishi; Hiromi Nakanishi; Junshi Yazaki; Naoki Kishimoto; Fumiko Fujii; Kanako Shimbo; Kimiko Yamamoto; Katsumi Sakata; Takuji Sasaki; Shoshi Kikuchi; Satoshi Mori; Naoko K. Nishizawa


Journal of Experimental Botany | 2006

Transcriptomic analysis indicates putative metabolic changes caused by manipulation of phosphorus availability in rice leaves

Jun Wasaki; Takuro Shinano; Kazuki Onishi; Ryoma Yonetani; Junshi Yazaki; Fumiko Fujii; Kanako Shimbo; Masahiro Ishikawa; Zempei Shimatani; Yuko Nagata; Akiko Hashimoto; Tomoya Ohta; Yuki Sato; Chikako Miyamoto; Sachiko Honda; Keiichi Kojima; Takuji Sasaki; Naoki Kishimoto; Shoshi Kikuchi; Mitsuru Osaki


Physiological Genomics | 2004

Transcriptional profiling of genes responsive to abscisic acid and gibberellin in rice: phenotyping and comparative analysis between rice and Arabidopsis

Junshi Yazaki; Zenpei Shimatani; Akiko Hashimoto; Yuko Nagata; Fumiko Fujii; Keiichi Kojima; Kohji Suzuki; Toshiki Taya; Mio Tonouchi; Charles F. Nelson; Allen Nakagawa; Yasuhiro Otomo; Kazuo Murakami; Kenichi Matsubara; Jun Kawai; Piero Carninci; Yoshihide Hayashizaki; Shoshi Kikuchi


DNA Research | 2003

Genomics Approach to Abscisic Acid- and Gibberellin-responsive Genes in Rice

Junshi Yazaki; Naoki Kishimoto; Yuko Nagata; Masahiro Ishikawa; Fumiko Fujii; Akiko Hashimoto; Kanako Shimbo; Zenpei Shimatani; Keiichi Kojima; Kouji Suzuki; Makoto Yamamoto; Sachiko Honda; Ayano Endo; Yumiko Yoshida; Yuki Sato; Keiko Takeuchi; Kazuko Toyoshima; Chikako Miyamoto; Jianzhong Wu; Takuji Sasaki; Katsumi Sakata; Kimiko Yamamoto; Koh Iba; Takahiro Oda; Yasuhiro Otomo; Kazuo Murakami; Kenichi Matsubara; Jun Kawai; Piero Carninci; Yoshihide Hayashizaki

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