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Plant Cell Biochemistry Lab
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A lab that investigates how plants take up and use nitrogen.
AboutAbout the lab
Plant nitrogen use: the source of all life on Earth
The Plant Cell Biochemistry Lab studies how plants take up nitrogen and use it inside their bodies.
Plants absorb nitrogen from the soil through their roots, convert it into amino acids, and synthesize many nitrogen-containing compounds, including proteins, nucleic acids, and chlorophyll.
Animals depend for their survival on the nitrogen compounds and other compounds that plants synthesize.
The lab also studies the recycling mechanisms that plants have developed internally to make efficient use of limited nitrogen.
Key terms
- Transporter
- A protein that carries substances into or out of cells. Also called a transport carrier.
- Ammonium assimilation
- The reaction that converts inorganic nitrogen taken up from the soil into amino acids, which are organic nitrogen compounds.
- Translocation
- The movement of nitrogen released by the breakdown of leaf components during senescence to other parts of the plant, where it is used again.
NewsLab news
A paper by Associate Professor Kojima and colleagues was published in Rice Science
A paper by Associate Professor Kojima and colleagues was published in Journal of Integrative Plant Biology
A paper by Associate Professor Kojima and colleagues was published in Frontiers in Plant Science
ResearchResearch themes
Plants take up nitrogen from the soil through their roots, convert it into amino acids, and produce a variety of nitrogen compounds, while recycling limited nitrogen within the plant body for reuse. Focusing on themes related to primary nitrogen metabolism, the lab investigates the molecular mechanisms of nitrogen use inside plants.
*Illustrative imageHow roots take up nitrogen
The lab investigates how roots transport inorganic ions in the soil, such as nitrate and ammonium, as well as urea and amino acids, into cells. It studies nitrogen transporters and the genes involved in regulating them.
*Illustrative imageAmmonium assimilation and amino acid metabolism
The lab investigates the process by which inorganic nitrogen that has entered cells from the soil is assimilated into amino acids. Its physiological and biochemical research focuses mainly on glutamine synthetase (GS), glutamate synthase (GOGAT), and asparagine synthetase (AS).
*Illustrative imageNitrogen recycling mechanisms
The lab investigates how, during senescence, proteins, nucleic acids, and chlorophyll in leaves are broken down, and how the resulting nitrogen is translocated and reused. The research uses reverse genetics and molecular biology methods.
MembersFaculty
The members of the Plant Cell Biochemistry Lab consist of faculty, graduate students, and undergraduate students.As of 2024
- ProfessorToshihiko Hayakawa
- Assistant ProfessorSoichi Kojima
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Plant-uptake-indonesian” Dasaptaerwin / CC0 (cropped)
- How roots take up nitrogen: “Kürbis (Cucurbita maxima) Haarwurzeln--Josef Schlaghecken” Schlaghecken Josef / CC BY-SA 4.0 (cropped)
- Ammonium assimilation and amino acid metabolism: “Glutamine-from-xtal-3D-sf” Ben Mills / Public domain (cropped)
- Nitrogen recycling mechanisms: “Up close with a California autumn leaf” darwin Bell from San Francisco, USA / CC BY 2.0 (cropped)
- Related lab (Plant Nutrition Lab): “Green rice sheaves planted in a paddy field with long shadows at golden hour in Don Det Laos” Basile Morin / CC BY-SA 4.0 (cropped)
- Related lab (Eukaryotic Microbial Functions Lab): “Koji Mold Rice” Zenyrgarden / CC BY-SA 4.0 (cropped)
- Related lab (Bioactive Molecular Dynamics Lab): “Working in the Medicinal Chemistry Lab ( )” National Center for Advancing Translational Sciences from Bethesda, MD / Public domain (cropped)
- Related lab (Nutrition Lab): “CSIRO ScienceImage 3075 Laboratory work with microcalorimeter” division, CSIRO / CC BY 3.0 (cropped)
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