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Ishikawa Prefectural University

Teaching Staff Information

Ayako Katayama-Ikegami Associate Professor

Degree:Ph.D. Agriculture

  • E-mail: aikegami[at]ishikawa-pu.ac.jp ※Please change [at] to @

Affiliated Departments
Undergraduate Faculty Department of Bioproduction Science Plant Production Group  
Graduate School:
Master’s Degree Course
Division of Bioproduction Science Plant Production Research Field Pomology
Graduate School:
Doctoral Degree Course
Division of Sciences for Bioproduction and Environment Bioproduction Science Research Field Pomology

Subjects taught
Undergraduate Faculty Biology
Laboratory Work in Plant production Science II
Exercise for Biopruduction Science
Graduate School:
Master’s Degree Course
Advanced Course of Bioresources and Environmental Sciences I
Special Lecture on Bioproduction Science I
Regulation in bioproduction
Seminar on Bioproduction Science II
Research Work on Bioproduction science (Research Instruction)
Graduate School:
Doctoral Degree Course
Seminar on Sciences for Bioproduction and Environment I
Research Work on Sciences for Bioproduction and Environment (Research Instruction)
Academic Societies/Awards/Background
Background JSPS postdoc fellow
Academic Societies/
The Japanese Society for Horticultural Science
American Society for Enology & Viticulture Japan Chapter
Japanese Society for Plant Cell and Molecular Biology
The Japanese Society for Chemical Regulation of Plants

Primary Research
Research Fields Pomology
Keywords Flavonoid, Diospyros kaki, Vitis labruscana, proanthocyanidin, anthocyanin, biosynthesis, molecular marker, astringency, tannin
Research Topics
  • Research on flavonoid accumulation in fruits

    Anthocyanins and condensed tannins (proanthocyanidins, causes astringency) accumulated in grape peels or persimmon fruit are flavonoids. Flavonids are secondary metabolites, and are involved in a lot of physiological functions, such as its own defense, and insect attraction for seed dispersal. Recently, flavonoids have also received much attention as functional ingredient for health benefits to humans. Accumulation of these flavonoids is one of the factors which determinate the quality of fruits, however, the mechanism of rapid accumulation in large quantity of these secondary metabolites in fruits have not been well understood. We are interested in coloration of grape berries and astringency of persimmons, to clarify the molecular mechanism of accumulation of these metabolites.

  • Isolation of molecular markers linked to PCNA traits of persimmon fruit

    Persimmons are classified into four types depending on its natural astringency-loss on the tree and the effect of pollination on flesh color; pollination-constant, astringent (PCA), pollination-variant, non-astringent (PVNA), and pollination-variant, astringent (PVA). Among these cultivars, only PCNA-type fruit cease tannin accumulation at an early stage of fruit development, and the fruit then lose astringency naturally during fruit development on the tree. The PCNA trait is one of the most important objectives in breeding programs. There are two PCNA types, which differentially originated in Japan (JPCNA) and China (CPCNA). We are developing marker-assisted system for breeding programs of new PCNA cultivars having the CPCNA trait.

Research Achievements
  • (134.6 kB)

Teaching goals To obtain the basic knowledge involved in fruit production, the course gives an outline of physiological/ecological characteristics of fruit trees, breeding, husbandry, fruit development from flowering to maturation, and post-harvest. Also, the lecture includes the most recent topics to promote better understanding of the current situation of fruit production.

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