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Mizuta Lab (Breeding Biology Division)
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The lab clarifies how kelp matures and leaves the next generation, and applies this to seaweed beds and aquaculture.
AboutAbout the lab
Applying how seaweed lives to seaweed beds and aquaculture.
Professor Hiroyuki Mizuta’s lab studies how seaweeds such as kelp live and increase in an ever-changing environment.
Seaweeds form seaweed beds along the coast, where they serve as habitat and food for marine life and help purify the water.
The lab focuses on the maturation of the kelp that people farm and harvest, and studies the conditions and mechanisms that lead to maturation, as well as techniques for controlling it by human hands.
Other research topics include the techniques that underlie seaweed reproduction and breeding, the mechanisms by which seaweed protects itself from stress, and nutritional physiology.
Key terms
- Seaweed bed
- A coastal area where seaweed grows thickly. It serves as habitat, a nursery, and a food source for marine life.
- Sporophyte
- The large generation in the life cycle of kelp, the one that people see and that is farmed and harvested.
- Sorus
- A reproductive organ that forms on the surface of mature kelp. Reproductive cells called zoospores are produced inside it.
ResearchResearch themes
Maturation of the kelp sporophyte supports reproduction in natural seaweed beds and is essential for securing the mother plants used in seed production for aquaculture. The lab studies the conditions and mechanisms that lead to maturation and techniques for controlling it by human hands, aiming to contribute to aquaculture, the maintenance of seaweed beds, and environmental conservation.
*Illustrative imageMechanisms that lead to kelp maturation
When a sporophyte matures, sori form on its surface and reproductive cells are produced. Because the timing and degree of maturation greatly affect the size of the next generation, the lab studies the conditions and mechanisms that lead to maturation.
*Illustrative imageStudying maturation with tissue piece culture
A kelp sporophyte can grow from several tens of centimeters to several tens of meters, so it is difficult to grow a whole plant in the laboratory. The lab therefore cultures tissue pieces, and has shown that any part, from the base to the tip, has the ability to form sori.
*Illustrative imageFronds that drift away without maturing
In nature, much of the tissue at the tip drifts away without maturing. Forming sori requires accumulated nutrients, and it has been shown that a lack of them is the cause.
*Illustrative imageHow kelp protects itself
Kelp protects itself through cell wall polysaccharides, intracellular structures containing phlorotannins, defense responses involving reactive oxygen species, and other means. This defense is also important for protecting the sori.
MembersFaculty
- ProfessorHiroyuki Mizuta
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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: “Laminaria digitata (at low tide)” Hans Hillewaert / CC BY-SA 4.0 (cropped)
- Mechanisms that lead to kelp maturation: “Alga Toco Saccharina latissima” Baralloco / CC BY-SA 3.0 (cropped)
- Studying maturation with tissue piece culture: “Algues brunes (Laminaria digitata) (Ifremer )” Olivier Barbaroux / CC BY 4.0 (cropped)
- Fronds that drift away without maturing: “Laminaria digitata - England 1” Emőke Dénes / CC BY-SA 4.0 (cropped)
- How kelp protects itself: “Kelp forest Channel Islands” PatríciaR / CC BY-SA 2.5 (cropped)
- Related lab (育種生物学講座
（宇治利樹 准教授） ): “Nara-034 hg” H. Grobe / CC BY 3.0 (cropped) - Related lab (増殖生物学講座
（浦和寛 教授） ): “Mesocentrotus nudus” Dmitry Ivanov / CC BY 4.0 (cropped) - Related lab (育種生物学講座
（菅原一輝 助教） ): “CSIRO ScienceImage 952 Undaria pinnatifida Japanese kelp” division, CSIRO / CC BY 3.0 (cropped)
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